Chillin' Louie (Part II: The tii-Specific a/c Crankshaft Hub)

Jump to content

The Hack Mechanic

Chillin' Louie (Part II: The tii-Specific a/c Crankshaft Hub)

a/c

air conditioning

tii a/c hub
Followers 0
In last week's introduction, I talked about how a/c helps extend my enjoyment of my vintage cars through the hot summer months, how I bought a used full-up Clardy system and a tii-specific crankshaft hub with a compressor pulley on it, and how I realized that, with summer on us, there was no reason to NOT start stuffing this stuff into Louie my '72 survivor-ish tii. So in I dove.

In my a/c book Just Needs a Recharge: The Hack Mechanic Guide to Vintage Air Conditioning, I say that one of the nice things about a/c retrofit is that, even though it seems like a huge project, it breaks itself up nicely into the following tasks:

Compressor and bracket

Condenser and fan

Evaporator assembly

Receiver-drier

Hose fabrication and installation

Wiring

Pressure-testing

Evacuation and recharge

Buttoning up

Further, for the most part, the car can remain drivable once each of these phases is completed. The radiator does need to come out to install the condenser and fan inside the nose, but after that, you can usually drop it back in, refill the cooling system, and keep driving the car.

On a tii, though, there's the added complication that the compressor belt runs in a groove on the crankshaft pulley behind the injection belt. This means that even to simply replace an existing compressor belt due to breakage or it being stretched past the point of adjustment, the engine has to be set to top dead center, the fan belt has to be removed, the lower pulley has to be unbolted and gently pulled off the front of the crankshaft, the upper and lower plastic timing belt covers have to be removed, and the injection belt has to be carefully slid off (and replaced if it shows signs of age).

Not quite ten years ago, I'd updated the a/c in Kugel, my other '72 tii. When I bought Kugel, it still had its original York compressor and massive bracket that wrapped around the front of the water pump. As part of the update, I bought a hobiedave bracket (from Dave Donohoe here on the FAQ) and a Sanden 508 clone compressor. Any tii with dealer-installed a/c has had two slots cut into the plastic lower timing belt cover to allow the compressor belt to pass through. The Behr installation manual has a template for where to cut the slots. When I updated Kugel, I found that I not only needed to extend the slots by quite a bit, but I also needed to rout out the slots in the lower timing cover on the front of the engine itself. I'll cover these issues in the next installment. However, at least Kugel had dealer-installed air, so it already had the a/c front hub that's unique to the tii with the compressor pulley sitting behind the cogged gear for the injection belt, and slots cut for the compressor belt. Louie didn't have any of that. I'd bought the tii-specific a/c hub on eBay years back. Now I needed to install it. So, for this a/c retrofit, this was task #0 added to the above list.

The hen's-teeth-rate tii-specific a/c crankshaft hub

The first step was to remove the old crankshaft hub, because if I couldn't, it was game over for a/c retrofit. For that, I needed access to the hub, so the radiator had to come out and the front sway bar end links needed to be disconnected so I could tip the bar forward and out of the way.

I first set the engine to TDC using the marks on the front pulley and timing belt cover, then undid the four 10mm bolts holding on the front pulley and gently pulled it off. I then put a 36mm socket on a breaker bar and, with the car in gear and the handbrake on, tried to break the nut on the crank hub.

Trying to remove the crankshaft nut with a breaker bar. And failing.

Of course, this didn't work—it moved the car before moving the nut—but it DID succeed in moving the engine away from TDC by an amount I couldn't tell because the TDC mark was on the pulley I'd just removed. D'oh! So I temporarily put the pulley back on, lined the engine back up to TDC, made sure I could see the TDC mark through the bell housing window since the one on the front pulley was about to go away, and painted the flywheel TDC mark with Wite-Out.

Temporarily replacing the front pulley to read the TDC mark

I then thought to look at the index marks on the Kugelfisher pump. The one on the gear should line up with one on the pump body. To my surprise, they were off from each other by a few teeth. This was how I'd been driving the car for four years. I photographed it just in case the car ran like crap when I put it all back together with the marks lined up.

The indexing marks on the Kugelfischer injection pump and its toothed gear

I then did what I should've done the first time and used my impact wrench on the crankshaft nut. It spun right off.

Air tools to the rescue

Next, I put a puller on the crankshaft hub. Like nearly any crank and hub, there's a keyway in both and a little Woodruff key keeping them in line, so if the hub hasn't been off the car in nearly 50 years, things can sometimes be pretty stuck, but it pulled off without a lot of effort.

Extracting the old hub with a puller

I used a Scotch Brite pad to clean off the surface of the a/c hub that runs inside the front main seal, as it had oxidized from sitting. I later also cleaned up the grooved pulley surface as well. I then compared hubs just to make sure nothing looked amiss.

Original tii crankshaft hub (right) and tii-specific a/c hub (left)

Then on went the a/c hub. Unlike trying to take it off, I was able to torque it down to the required 140 ft-lbs by simply having the car in gear and the handbrake on.

And... installed

On a non-tii, you obviously wouldn't have to futz with the hub at all to retrofit or update a/c, and you'd go straight to installing the compressor and bracket. Or, if your tii wasn't air conditioned, you could simply put the injection belt back on and button up the car. But on an air conditioned tii, the steps are intertwined. That is, you have to:

Install the compressor, bracket and belt, and correct any belt alignment or tension issues.

Modify the slots in the plastic lower timing belt cover if they already exist, and cut them if they don't.

THEN put the injection belt back on and button things up.

But I think I'll leave that for the next installment.

--Rob

(My a/c book Just Needs a Recharge: The Hack Mechanic Guide to Vintage Air Conditioning can be purchased here on Amazon, or personally-inscribed copies of it and my other books can be purchased directly from me here.)
Was it helpful?
By thehackmechanic

June 29, 2021
Share
Share
Followers 0
Previous Article Chillin' Louie (Part I: Introduction)

Next Article Chillin' Louie (Part III: The Compressor, Bracket, and Injection Belt Cover)

User Feedback
- 1 Comment
Recommended Comments

442stang 18

Posted October 2, 2021

Share this comment

Installing a Tii crank pulley the easy part. It is finding one to install the challenge Looking to have them re-manufactured for our AC kits www.Dtechparts.com

Link to comment

Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!
Register a new account

Sign in

Already have an account? Sign in here.
Sign In Now

Freeing Stuck Rear Brake Adjusters

thehackmechanic, June 27, 2022

10604 views   21 comments

One of my least favorite jobs on a 2002 is adjusting the rear brake shoes in order to lessen the brake pedal travel. In principle, it's easy—you just pull off the rear wheels, take a 17mm open-end wrench, put it on each of the two adjusting nuts on the backing plate behind each brake drum, rotate the drum, turn the adjuster until you can hear and feel the shoe rubbing against the drum, back the adjuster off a tiny bit, do the other adjuster, then move to the other side and do the same on the other drum. Boom, done. If you have the dog-leg brake adjuster wrench, in theory you even can do it without taking the wheels off, as the dog-leg shape reaches around the tire. The problem is that it's very common for the adjusters to be seized, and because there's not enough clearance on the nuts on the back to fit a box-end wrench, you have to use an open-end wrench, and if the adjuster is seized, the open-end wrench will round the corners off the nut right quick, and then you're boned. The dog-legged special brake adjusting wrench doesn't change that one whit. If anything, it may speed up the rounding process, as typically I'll try to tap on the end of the wrench with a hammer to budge the adjusters, and I think that a regular straight open-end wrench is more likely to deliver the torque squarely to the nut than the offset-angle shape of the dog-leg wrench. So what do you do? Here's my recipe: Heat, wax, and a stud remover. If you don't know what a stud remover is, they work sort of like the chuck on a drill. Twist the locking ring on the outside counter-clockwise, and the three internal jaws move together and lock around whatever is inside them. You typically can tighten them either with a big crescent wrench, or better yet, a 3/8-inch ratchet or breaker bar stuck into the end. You can buy them on Amazon for about twenty bucks. Just make sure that they'll handle up to a 1/2-inch stud, as the fat part of the adjuster that they need to grab is just a shade under that. As far as heat and wax, I've written multiple articles about it, and how it's waaaaaaaaay better than any penetrating oil, even SiliKroil. Remember that heat does not mean a propane torch. Propane usually doesn't get things hot enough to un-seize fasteners. If you have an oxy-acetylene setup, great, but if not, Home Depot and Lowe's carry MAPP gas torches. They're the same compact size as propane torches, and they produce a hotter flame. There's a bit of a debate as to exactly how heat works to free stuck fasteners. The "metal expands when it's heated" theory tells you to heat the part around the stuck fastener, not the fastener itself (e.g., if a nut is stuck on a bolt, heat the nut cherry red, not the bolt). The other theory is that expansion is less important than the heat breaking the bond of corrosion. Whichever, using heat, and lots of it, is a proven method of removing fasteners that laugh at your application of PB Blaster or SiliKroil. As far as wax goes, my friend Lindsey Browne, one of the admins of the Facebook BMW 2002 group and shop foreman at The Little Foreign Car Garage in Waltham MA, wrenches on a whole variety of old metal and turned me on to the use of wax years ago. There used to be a product called Goodson Oil Gallery Wax Sticks. Unfortunately they're no longer made. Goodson now sells beeswax instead. Whatever wax you use, the trick is to heat up the stuck fastener to the point where it begins to glow, let it cool for a minute or two, apply the wax and let it wick into the thread or the crevice you're trying to free up, wait a few minutes, and then give a go at loosening it. If it doesn't work, repeat the process. It may still take several attempts. Patience is a virtue and all that. Back to the brake adjusters. You can try putting the torch on the nuts on the back of the backing plate and applying the wax there, but it's much more effective if you do it on the front-facing side of the adjusters, and to do that, you have to pull off the brake shoes. I know, it's a little bit of a pain, as you have to deal with that bloody spring at the bottom. But if your adjusters are stuck, it's what you have to do. And it's really not that bad. Pop off the spring on the bottom, spread the bottoms of the shoes apart, and with care, you can spread the tops of the two shoes from around the wheel cylinder and swing them off with the top spring and the little bracket still attached. Once you have the shoes off, use the MAPP gas torch to heat the protruding part of the adjusters (okay, the areas around the protruding parts of the adjusters) nice and hot. Then apply the wax and let it wick in. Then put the stud remover on the protruding part of the adjuster and put a ratchet wrench handle on it and tighten it down until it grabs. Once it's freed, the adjuster should be free to turn in either direction (left or right), but because the stud extractor is meant to remove threaded studs, it tightens around the stud when you turn it left so it can grab a stud and unthread it, so you need to turn the handle to the left. DO NOT PUT SO MUCH LEVERAGE ON IT THAT YOU RISK SNAPPING THE ADJUSTER OFF! If it doesn't begin to give, repeat the heat and wax application. I have never had this method fail. The beauty of it is twofold. First, it'll free up the adjuster without continuing to round the corners off the nut on the back. Second, once the adjuster frees up, you can keep spinning it around while you spray penetrating oil front and back (or, if necessary, use more heat and wax) until it's so free that you can easily turn the nut on the back, even if a few of the corners have already rounded. I recommend positioning the adjusters so the protruding dowel pins are at the top of their arc of travel. That way, once the brake drums are back on and you can't see the adjuster pins, you'll know that you need to turn the adjusters to move the dowels to the outside. That's more intuitive than having to remember that the left rear adjuster needs to be turned clockwise, the left front counter-clockwise, etc. Reassemble, adjust (perhaps easily for the first time in your life), and enjoy the low travel of the brake pedal. --Rob
Read more

Front Strut Replacement The Hack Mechanic Way

thehackmechanic, November 3, 2021

20920 views   12 comments

Front Strut Replacement Overview Okay. It's time to replace your front struts. Maybe you're doing it as part of a shocks-and-struts job. Maybe you're updating the entire suspension—shocks and struts, springs, and sway bars. Maybe you're doing a full front end refresh including ball joints, tie rods, center track link, and idler bushings. Maybe you're doing an undercarriage refresh and are sandblasting and repainting the subframe and strut housings at the same time. Whatever the reason, if you've never done this before, there are a few things to know. Rear shocks are trivial—jack up the back of the car, pull the wheels off, undo the 19mm nut at the bottom, bang the shock off the slanted stud with a rubber mallet, undo the two 14mm nuts at the top, drop out the old shock, pop in the new shock, done—but front struts aren't. If no other related parts are bad, you can easily get both struts done in an afternoon. But the strut directly or indirectly touches many other components, so it's easy to slide down the slippery slope. If you want to, that's fine. And sometimes, when you get partway into it and find that other parts are bad, you have no choice. But you also can stay on task, get 'er done, and enjoy the fruits of your labors. Parts New strut cartridges New strut tower bushings ("hats") if they're bad New upper and lower perch rubber if they're bad Tools Spring compressor Two big pipe wrenches 13mm socket and wrench 14mm socket and wrench 19mm socket Rubber mallet, hammer, and chisel Wire cutters and needle-nose Vise Grips Possibly a MAPP gas torch The Big Picture When we say "front struts," we're talking about the replaceable front strut cartridge that threads into the tube that's part of the strut assembly. But the larger context is that this is a Macpherson strut assembly, which is a type of front suspension where the springs and shock absorbers are mounted along the steering axes. That is, when you turn the steering wheel, it actually rotates the springs and shock absorbers (struts), which in turn moves the front wheels and tires tire. Note that the other major sportscar front suspension is a double-wishbone or double-A-arm, where the springs and shocks are not attached to the wheels and have no role whatsoever in the steering. The left front strut assembly. You can see how it not only suspends the car and absorbs shock, but also turns the wheel. It's helpful to understand that BMW used two primary MacPherson strut designs. On the 2002 and up through, I believe, the E30, the design had the strut housing (the tube) and the spindle (the stub axle that the wheel bearing, hub, and rotor spin on) as a single lifetime-of-the-car unit. The strut cartridge was the replaceable part that threaded into the top of the tube. The steering knuckle to which the ball joint is attached bolts to the bottom of the strut assembly. In contrast, beginning I believe with the E36, this changed to a different design—the strut cartridge and the housing became a single replaceable unit, and instead of the spindle being a permanent part of the housing, the spindle was integrated into steering knuckle, and this lifetime-of-the-car component bolted to the bottom of the housing. None of this changes anything with regard to doing the struts on a 2002, but it will help you if you're daily driver is, say, an E46, you order front struts for it, they arrive, you open up the box and think "what the hell am I looking at?" The strut cartridge being slid out of the tube in the strut assembly. This is actually off my 635CSi, but the configuration on a 2002 is similar. Stock photo of a set of Bilstein front struts for an E46, showing how the replaceable part is no longer a "cartridge" but is instead a structural housing as well. Back to the 2002 struts. The lower spring perch is an integral part of the top of the strut assembly. The spring sits on top of it. On top of the spring is the upper perch, which is a plate with a hole in the middle. A piece of perch rubber sits between the spring at the perch at both the top and bottom. The strut cartridge has a piston that extends upward through the hole in the middle of the upper spring perch. On top of the upper perch is a small spacer (really, a washer), and the strut tower bushing/bearing (sometimes called "the hat") sits on top of that, with the threaded tip of the strut cartridge's piston sticking up through the bearing in the center. A washer, a cylindrical spacer, and another washer slide over the top of the piston, and a Nyloc nut threads into the tip, holding it all in place. I'll get lazy for a moment and just pilfer one of c.d.iesel's illustrations that can be found here on the FAQ, as all of the components are plainly visible in it. c.d.iesel, we miss you.. . To be clear, when I refer to the "strut housing" or the "strut tube," I'm referring to the major life-of-the-car component consisting of the tube, the lower perch, and the spindle. When I refer to the "strut assembly," I'm referring to the entire assembled unit with the strut cartridge, spring, hat, hub, and rotor all installed. This is what I'm referring to as the strut assembly. But here's the thing: The spring is under compression. It's being squeezed by the "hat" that's held on by the Nyloc nut that's threaded onto the piston extending from the strut cartridge through the middle of the hat. So if you undo that nut, as soon as its threads no longer engage those on the tip of the piston, the compressed spring will un-compress and launch the hat and the spacers, possibly right into your face. This is extremely dangerous. Because of this, you never, ever, under any circumstances should undo that nut without first compressing the spring. Got it? Good. (Having said that, I should also walk it back just slightly. If the car has lowering springs and gas shocks, once the strut assembly is removed from the car, the combination of there no longer being weight on the spring from the car, and the gas shock extending and thus pushing the hat up as far as it'll go, can make it so there's not any tension on the spring. But with stock springs, this is never the case.) So, to replace front strut cartridges, the big picture is that you have to first: Remove the strut assembly from the car and lay it on the floor. Use a spring compressor to compress the spring to take the tension off the hat. Remove the hat. Remove the spring. Then and only then you can remove the cartridge from the tube of the strut housing. Now, it is sometimes possible to do this without completely removing the strut assembly from the car—and I'll get to that—but it risks damage to the paint on the fender lap, and it doesn't always work. The Spring Compressor You'll read two extremes online regarding using a spring compressor. One extreme is that some people are too cheap to buy or rent a real spring compressor and instead will use hose clamps or even zip ties. I, in my persona as The Hack Mechanic, will certainly scrounge my way around not having every special tool, but this is absolute idiocy. Any AutoZone, O'Reilly's, or Advance Auto Parts will rent you a spring compressor at zero cost (buy it and return it for a full refund). The simplest "claw"-style compressor is less than twenty bucks on Amazon. Why anyone would go to all the extra work, much less accept the inherent safety risk, of something like hose clamps and zip ties when using something purpose-built is either free or costs less than a pizza is beyond me. (Note that, for the springs on my Lotus Europa, I did have to build my own spring compressor with hooks and turnbuckles because there is no commercially-available compressor for springs that small and whose coils are that tightly stacked—not even a motorcycle spring compressor would work—and when I asked a Lotus parts supplier what they used, he described something home-built and virtually identical to mine. But I digress.) But the other extreme is where people caterwaul that using a spring compressor is an inherently dangerous activity where one false move will kill you, and thus you're crazy to even attempt replacing front struts yourself and are better off leaving strut replacement to a professional. This is a massive overreaction. Use the spring compressor as it's intended, don't use a $20 compressor meant for a little itty bitty spring on a Toyota Yaris to compress massive springs on an F350, pay attention every step of the way, and as an added safeguard, just in case something happens, don't ever aim the compressed spring at your head. That's really about it. If you look on Amazon or eBay, you'll see four main types of spring compressors: 1) The Claw: The simplest and cheapest. These are a pair of threaded rods, each of which has two opposite-facing two-pronged claws. One claw is fixed at the end of the rod. The other moves up and down as you tighten or loosen its nut. You put the pair of them at 6:00 and 12:00 on the spring and tighten their nuts round-robin to compress the spring. The main advantages of The Claw are low price and light weight. The main disadvantage is that it doesn't compress the spring evenly. At best, you need to alternate tightening one, then the other, to keep the both sides of the spring evenly compressed. At worst, it's possible for one of them to "walk" along the spring until it slides down next to the other one, creating a huge bulge-out on one side of the spring. Some but not all claw compressors have safety dowel pins to prevent the spring from accidentally slipping out from under the claw. Your typical eBay $20 claw-style compressor. This one has no safety dowel pins. A $32 eBay claw compressor with safety dowel pins. 2) The Clamshell: This design looks a bit like Pac-Man or like an A-frame house on its side. It uses a threaded rod to pull together two assemblies that are hinged at one end. Hooks and metal pins are used to secure the spring. I believe that the original tool is from the respected tool house OTC, and is not cheap; Amazon sells them for almost $350. As is often the case, Chinese-made knockoffs appeared a few years back. A quick look shows that those appear to be largely gone from eBay. I can't say that I've ever used the clamshell, as it never appeared to be terribly substantial to me or to have a great amount of range. OTC clamshell compressor. 3) Plate or Fork-Style Compressors: In 1984, I bought the spring compressor that BMW CCA co-founder Michel Potheau at the legendary Circle Tire Corporation (CTC) sold in the centerfold ad he had for years in Roundel magazine. I still have it. It looks like a 2002 tire jack onto which someone has welded a pair of angled or slightly twisted plates that slide between the coils of a spring. You then turn the crank, and a threaded rod in the backbone of the "jack" raises the lower plate, thus compressing the spring. My ancient battle axe of a compressor, purchased from the hand of Michel Potheau himself. You can see the angled twist in the plates to allow them to slide between the angled coils of the spring. The little tabs on the end help ensure that the spring won't slide out. This is an example of what I call a plate compressor, but apparently they're referred to commercially as fork compressors. A variety of them, mostly Chinese-made, are now available on eBay and Amazon for $120 and under. But instead of having a hand-turned crank, they have the head of a bolt at the bottom of the backbone that can be turned with a wrench or a socket (or, if you want to shorten its life, an impact wrench). And they generally come with two or three different-sized plates to accommodate springs of different diameters. The huge advantage of these is that, unlike the claw or the clamshell that only contacts the spring at two points, the plate makes contact with the spring essentially all the way around, virtually eliminating the chance of slippage. There's another advantage that I'll get to when I discuss the alternate removal method. The disadvantages are cost and weight. I give a strong recommendation to this style of compressors. My recently-purchased plate-style compressor comes with three different sized plates. The assembled plate compressor. 4) Upright compressors: Commercial shops have long used heavy duty upright spring compressors. Some bolt to a wall. Others are free-standing. Some simply have a long lever arm that you pull to compress the spring. Others have a drill-press-like three-armed spindle wheel and gearing for mechanical advantage. A third type has an integrated bottle jack, letting a rising hydraulic cylinder do the work for you. As with so many tools, what was once only available to pros has been copied and stamped out. The main advantage is that they hold the strut assembly securely and compress the spring quickly. The main disadvantage is size and cost. I've never used one. Of the above four types, I strongly recommend the plate or fork-style compressor. But, again, even a rented set of claws or one purchased on eBay for $17 is going to be so much better and safer than hose clamps. Don't go there. The 2002 Strut Cartridge Grossly speaking, 2002 strut cartridges fall into three categories: Oil-filled. I don't know if all 2002s originally had oil-filled strut cartridges, but I believe all the round tail light cars did. These are "wet" cartridges. The cartridge is not the full diameter of the strut tube. When you remove the cartridges, oil streams out the bottom. And when you tip the strut assembly upside down, more oil runs out. An original oil-filled strut cartridge. Note how much smaller it is than the diameter of the strut housing. Hydraulic. These are oil-filled as well, but they're "dry" cartridges. They're the diameter of the strut tube. If they're leaking oil, they're bad. Gas-filled. Oil-filled struts and shocks don't really have a preferred direction. When they're out of the car, it takes about equal effort to compress or to expand them. In contrast, the natural resting state of gas-filled or gas-pressurized struts and shocks is fully extended. When they're out of the car, if you compress them, they'll immediately expand back to their extended state. The pressurization and internal valving is or should be tuned to a car's weight so that, once weight is on them, they're more or less neutral with regard to up or down motion, but all other factors being equal, a car with gas shocks such as Bilsteins may sit a little higher at rest than a car with fluid-filled shocks. A Bilstein strut cartridge whose diameter essentially fills the strut tube. In terms of removal and replacement, it doesn't really matter which type you have. They're all held in place in the tube with a collar nut that may have required a special tool back in the day, but after decades, it usually takes a pipe wrench to get it off. Just be aware that, when you undo the collar nut and start to lift the old strut cartridge out, if it's narrow instead of filling up the entire tube, it's a "wet" cartridge and it's going to dump oil all over your garage floor if you're not careful. The Standard Procedure Now that you understand what a Macpherson strut is, what portion of it in a 2002 is the standard replaceable part, and what the spring compressor does, here are the steps for the standard procedure to remove the strut assembly and replace the strut cartridge. There are a total of 11 nuts/bolts on each side—14 if you count the lug nuts. Removing The Strut Assembly Jack up the nose of the car and set it securely on stands. Work on one side at a time. Remove the wheel (so, unless you have an impact wrench, crack the lug nuts before you jack up the car). Use a 13mm socket and wrench to undo the bolt and nut holding the brake lines to the retaining plate on the strut assembly. Use a 19mm socket to undo both of the bolts holding the caliper to the strut assembly. They're usually pretty tight. A pipe on the end of a breaker bar makes short work out of them. Pull the caliper off the rotor and out of the way. I usually just set it on the control arm. The caliper removed and set on the control arm. Use a 13 or 14mm socket and wrench, depending which size the car has, to remove the two nuts at the bottom of the sway bar link, and then remove the retaining plate and the rubber bushing. This isn't absolutely necessary, but it allows the control arm to dip lower, which helps you get the strut out. The sway bar end link locking nuts. Look at the very bottom of the strut assembly where the steering knuckle is attached and identify the three 14mm bolts with little holes in their protruding heads. The one that's above the center of the control arm is easy to see, but will be hard to remove. The other two are practically against the brake backing plate. The bolts with their safety wire holding the steering knuckle to the bottom of the strut housing. Originally there was safety wire running through the holes. It may or may not still be there, as some folks rely on Loctite instead. If the safety wire is there, use wire cutters to cut it between all three bolts, and pliers or needle nose Vise Grips to pull it out. If it's rusted in place in the holes, penetrating oil such as Silikroil may help free it. Position the steering wheel so the wheels are facing straight ahead, and remove the key so the steering locks in this position. Use a good six-pointed 14mm socket and a short extension (or a long socket) to remove the two bolts that are against the backing plate. You really, really don't want to break or round the corners off these bolts, so make sure the socket is square with the bolt. If it doesn't break free, don't force it by putting a pipe on the end of a breaker bar. Instead, use a scratch awl and some brake cleaner to clean off the top of the bolt hole (the bolt threads all the way through the knuckle), then spray penetrating oil like SiliKroil on it, wait a bit, and try again. If you have a MAPP gas torch, heat up the part of the steering knuckle the bolt goes through. Safety wire removed, one bolt partially out. For the third bolt, the one that's over the control arm, there's not enough space to get a socket on it, so instead you need to use a 14mm box-end wrench. There's not even enough space for that, so what you have to do is take a small floor jack, put it under the end of the control arm, and jack it up until you've created enough clearance to access it. Be careful that, in jacking up the control arm, you don't lift the car off the jack stand on that side. Due to the fact that a wrench is generally shorter than a ratchet handle, you may have trouble getting sufficient leverage to loosen this bolt, but again, be very careful not to round the corners off the bolt head. Jacking up the end of the control arm to increase access to the middle bolt. Reaching that middle bolt with a box-end wrench. If you do strip one of the bolt heads, particularly the middle one above the control arm, I've gotten out of it by disconnecting the tie rod from the steering knuckle and unbolting the lower control arm with the tension strut attached, and removing the strut assembly from the car with the knuckle and lower control arm attached. Then, with it on the ground, you can rotate the lower control arm on the ball joint and get better access to the head of the middle bolt. But it's a pain. This is why you really don't want to round off the corners on those bolt heads. With all three of the steering knuckle bolts removed, separate the knuckle from the bottom of the strut housing. It's held in place with a notch and a slot. Banging on the extended portion of the knuckle—the part the tie rod attaches to—with a rubber mallet usually frees it. If that doesn't work, tap gently anywhere on the seam between the two components using a hammer and a chisel. The steering knuckle freed from the bottom of the strut assembly, showing the notch as well as the castellated nut for the ball joint . Once the knuckle is free from the bottom, the only thing holding the strut in place is the "hat" at the top, where the three studs protrude through the underside of the strut tower. Undo the three nuts on the three studs and take off their thin wavy washers so you don't lose them. If the bottom of the strut assembly is still sitting on top of, though no longer fastened to, the steering knuckle, it should gently settle down on it, forcing it and the control arm lower, but just to be sure (you don't want the strut assembly crashing to the ground), have a hand on the strut assembly while you remove the last nut. Just three nuts between the strut assembly and freedom. The whole assembly, with the brake rotor on it, weights about 30 pounds. It's not that difficult to maneuver around. With everything disconnected, pull the bottom of it off the steering knuckle and toward you, then guide the top of it out from under the fender, taking care that the studs on the hat don't scratch the fender lips. Lay the strut assembly on the ground. Pat yourself on the back. Yeah baby. Evaluate The Strut Tower Bushings I call them "strut tower bushings," and many in the community refer to them as "hats," but realoem.com calls them "guide supports," and many vendors label them as "strut mounts." Whatever you call them, the part number is 31-33-1-110-195. Since you're about to remove the hats, now is a good time to evaluate them. If the rubber is cracked anywhere, replace them. They should spin freely without noise or binding. There should be little to no play in the bearing. And remember what it feels like when you spin it, because if you're reusing it, when you put the strut back together, it should feel about the same, maybe a little tighter but not binding. If there's nothing obviously wrong with them, I don't have any qualms about reusing them, but some folks prefer prophylactic replacement. Genuine BMW OE hats are about $140 each. There's a large range of aftermarket parts down to about $35 each; look here on the FAQ for recommendations. If you do reuse them, you might want to pick the old caked grease out with a fine pick and repack them. The rubber for the "hats" is oven cracked. If it is, replace them, but if it's not and the bearing spins free and smooth, it's not a sin to reuse them. The Headlight Spacer If your car still has the original aluminum spacers between the hats and the underside of the shock tower, remove them. Their sole purpose was to satisfy U.S. federal headlight height requirements. With them gone, it'll settle down the front suspension so the car doesn't show as much wheel well above the front tires. And despite the note on c.d.'s illustration, do NOT relocate it to the top of the shock tower under the hood. They look stupid there. Seriously. Removing The Spring Okay. Onto the business end of the business. Lay the strut assembly on the floor. Insert your spring compressor between the coils, with the upper plate or claw as close to the upper perch as possible, and the lower plate or claw as close to the lower perch as possible. Preparing to compress. Compress the spring until you can see and feel the tension taken off the hat. If you're using something other than a plate compressor, be mindful that you're compressing the spring as evenly as possible. When you're certain there's no spring tension on the hat, it's now need to loosen the 19mm Nyloc nut at the top of the strut piston. The problem is that if you simply crank down on it with a wrench or a socket, the whole piston will turn. This is a job that's made for an impact wrench, as it'll whacketa-whacketa-WHEEEEE that nut right off. If you don't have an impact wrench, you need to hold the top of the piston still. The original struts have a little square boss at the top of the piston that you can get a little wrench on. Bilsteins have a hole for an Allen key. Note that to use either of these, you can't block the top of the piston, so you can't use a socket and ratchet handle; you need to use a wrench instead. Really, go buy yourself an electric impact wrench or an air compressor and an air impact wrench. I'm serious. Don't take the nut completely off until you've made absolutely certain that there's no tension on the hat. You can tell because should be able to move the hat freely. If you're certain, undo the nut, withdraw the three spacers from the top of the piston and take a photo of them in the proper order, then slide the hat off the top of the piston, and collect the bearing dust cap from underneath, and the spacer on the top of the upper spring perch. It's a good idea to then arrange all of these in the correct order on a paper towel and photograph them. All the spacers and washers as they came off Hampton, my 49,000-mile 2002. I don't think they'd ever been apart. Slide the upper spring perch up and over the piston. The upper perch rubber will probably come off with it. The upper spring perch just slides off. If you're going to be reassembly the strut with a new cartridge almost immediately, you can just slide the compressor and spring as a unit (with the compressor still compressing the spring) off the lower perch and set it aside somewhere safe. If doing this gives you the willies, or if you're going to use the compressor on the other side and then, say, sandblast and paint both strut housings, you can release the tension on the spring before removing it. It really doesn't matter. But I wouldn't recommend that you leave the spring compressed for days or weeks. Ready to remove the strut cartridge. Another pat on the back is appropriate. Removing The Strut Cartridge The strut cartridge is held in the tube by a collar nut (also referred to as a gland nut) at the top. If the struts still have the original oil-filled cartridges in them, there'll be what looks like a big hex nut at the top, but it's just a false cover. Pry it off and it'll reveal the circular collar nut. The false cover on the original collar nut. The original collar nuts have two holes in them intended for a special tool with two pins. The Bilstein collar nuts have two notches in them enabling use of the Bilstein 30mm ring tool, part # E4-MS09/7, with two tabs in it. The Bilstein gland nut with the notches in it. In either case, the common method of removing the collar nut is to use two big pipe wrenches, the ones with the thumb ring adjusters and the serrated jaws that bite into the material. Why two ? One to twist the nut, and the other to hold the body of the strut assembly still. Make no mistake, this will dig into and mar the outside of the strut tube. I don't really care about a few serrated gouge marks in places I won't ever see. If you do care, instead of using a second wrench, you can take a long piece of angle iron, drill two holes in it the same spacing as the holes on the tab on the strut housing that holes the brake lines, bolt it on, and secure it that way. Me, I put the second wrench between the collar nut and the spring perch, as the gouge marks aren't plainly visible there. You need to flip the second wrench in the opposite direction of the first so it bites into the tube, presses against the ground, and prevents the thing from turning while you use the other wrench on the collar nut. Soooooo... Lay the strut assembly, which no longer has the spring and hat on it but still has the brake rotor, on the ground. Get yerself two big-assed pipe wrenches. Position one on the collar nut, the other on the body of the tube below the nut, both facing to the right, flipped in opposite directions, so the second wrench braces the tube against the ground and prevents it from turning. The two-monkey-wrench method of collar nut removal. Lean on the first wrench with all your weight. If the collar nut doesn't come off, heat it with a MAPP gas torch and try it again. I've never had one not come off, but some of them have been astonishingly recalcitrant. This collar nut on my 635CSi required multiple applications of heat and torque before it gave it up. If the struts are the original oil-filled ones (which you'll know instantly because, when you start to withdraw them, they're narrow instead of filling up the entire tube), grab a tray or basin to catch the oil that is going to drip/gush from it when you withdraw it. You'll also want to tip the tube upside down to drain the oil out, then run a pole or wand with a wad of paper towels wire-tied to the end to give the bottom of the tube a cursory cleaning. You may engage yourself in the third self-back-pat. Inspection Inspect the strut tower bushings and perch rubber. If you have reason to replace them, do it. Also take this opportunity to inspect the ball joint and its rubber boot. If you need to replace the ball joint, you have to go through this same procedure to undo the steering knuckle from the bottom of the strut assembly, so if there's anything wrong with it, now's the time to deal with it. Other Slippery Slope Stuff Hey, if you want to use this as an opportunity to remove the hub, replace the brake rotor and wheel bearings, and sandblast and repaint the strut housing, go for it. But that's not my jam. The undersides of my cars are never going to look like anything other than the heavily-used cars that they are. Reassembly I could act like a repair manual and say that "assembly is the reverse of disassembly," but it never quite is. Strut Cartridge Thread the new strut cartridge into the tube and tighten it down. The torque spec I see here on the FAQ is 87 ft-lbs. That is tight. In comparison, the wheel lug nut torque is 59-64. And, unless you have Bilsteins and the tabbed ring tool, you're doing it with a pipe wrench, not a torque wrench . So... tight. Lean on it with a good portion of your body weight. You'll feel when it stops turning. I've never stripped one. Note that these collar nuts can loosen up, and they make one hell of a sharp banging over bumps when they do. Spring And Hat Installation Slide the lower perch rubber back into the lower perch, taking care to seat the recess in the rubber properly in the perch. Slide the still-compressed spring and compressor back onto the lower perch, taking care to seat the lower tail of the spring properly in the recess in the perch and the rubber. Slide the upper perch and its properly-placed rubber over the strut piston, taking care to seat the upper tail of the spring properly in the recess in the perch and the rubber. (By the way, this is where a plate-style compressor really shines. Because the plates compress the spring squarely, getting the spring to seat properly requires zero work. With claw-style compressors, the spring is distorted, and this step is non-trivial.) Verifying that the top of the spring is correctly seated in the perch and its rubber. Slide the spacer onto the strut piston. Slide the hat onto the strut piston, first making sure that the dust cap that protects the bearing underside is in place. Slide the three spacers (large, then tube, then small) over the strut piston and into the center recess of the hat. Thread on the new Nyloc nut. When you tighten it, you'll have the same problem as removing it, which is that the piston will want to spin. Either use an impact wrench (on its lowest setting) to spin it on, or hold the top of the strut still with the appropriate wrench or Allen key. The torque spec I see here on the FAQ is 52 ft-lb. For comparison, that's less than a lug nut, so it doesn't have to be tightened with a pipe and a dying strain or anything. Double-check that the spring tails are in their proper recesses in the perch. Undo the spring compressor. Spin the hat to make sure that it turns freely. It may be more difficult to spin than it was initially simply because the dust cap on the bottom is in a new position, but it shouldn't grind or bind. Pat on your own back #4 is now in order. Strut Assembly Reinstallation As I said, the strut assembly doesn't really weigh that much. It's not that difficult to just grab it, rotate the hat so the studs are correctly oriented (the two closer-spaced ones facing to the outside of the car), guide it into position under the fender, put the studs through the holes, and reach up and slide on a washer and thread a nut on one of the studs. Then you can let go and thread on the other washers and nuts. The FAQ lists the torque for the nuts as 18 ft-lbs. Guide the bottom of the strut onto the steering knuckle so the slot and notch are aligned. There is some debate about using Loctite Blue (medium strength) on the 14mm bolts. Some folks use safety wire but no Loctite. Others, Loctite but no safety wire. Some folks use both. Personally, I use a dab of Loctite Blue on the threads of the bolts. Thread the outer two bolts—the ones next to the brake shield—first, as they're the easiest to reach. Tighten them enough that they pull the steering knuckle and the notch square with the underside of the stud. Then you need to center the steering wheel (if it's moved) and do the trick with the little floor jack under the end of the control arm to raise it enough to be able to, with your two index fingers, position the 3rd bolt in the recess of the control arm, guide it into the hole, and finger-tighten it. Then snug all three bolts down. The torque on these 14mm bolts is only 18 ft-lbs. You can easily put a torque wrench on the two next to the brake shield, but the one above the control arm you need to tighten with a box-end wrench, so you have to do it by feel. The safety wire and the tool to twist it to make it look pretty are available on Amazon and any number of other places. Clean off the brake rotor with some brake cleaner, and reinstall the caliper. The FAQ lists the torque for the two 19mm bolts as 58 ft-lbs, fairly close to the lug nut torque. Put the bolt, nut, and washer back on the plate holding the brake hoses to the strut housing. Reinstall the sway bar end link bushing, retaining plate, and the two lock nuts. Put the wheel back on and take the car down off the stands. That's it. You may self-administer the 5th self-back-pat. Alternate Method Above, I teased that it is possible to replace the strut cartridges without removing the strut assembly from the car—specifically, without unbolting the bottom of the strut housing from the steering knuckle. It is possible. I've done it. I wrote about it in detail here. You can leave the steering knuckle attached, but you still need to remove the caliper and unbolt the sway bar end link. The key is that the kind of plate-style compressor I've been using enables the possibility of doing this because the tightening mechanism is at the bottom. You can't do this with either my crank-style compressor or with the claws because, in both cases, the tightening mechanism is at the top. If you turn the claws over so the tightening bolt is at the bottom, the extending length of the threaded rod hits the underside of the shock tower. Compressor on spring on still-installed strut. Strut assembly swung out from under fender while still being attached to steering knuckle. The problem with this is two-fold. First, it is challenging to compress the spring, strut cartridge, and the hat so much that the studs on the hat clear the underside of the fender lip without scratching them. If you look carefully at the photo above, you can see that I've repositioned the compressor so that the lower plate isn't on the spring—it's actually below the lower perch. This was necessary to squeeze the spring down as much as possible to clear the fender lip. The other problem is that, once you swing the strut assembly out, you still need to undo the collar nut, and that is more challenging with the assembly hanging out in space than it is with it laying securely on the garage floor. In the above photos, I did it in my '72 tii. I was willing to try because, well, it's kind of a ratty car, so if I scratched the fender lips (which I didn't), I wouldn't have really minded. I was successful, but when I had to do the strut replacement in Hampton, my 49,000-mile 2002 (which is where the rest of the photos are from), I didn't want to take the chance, so I just removed the strut assemblies. Conclusion If you do other wrenching, it's not really a big jump to replacing front struts. It's nothing to be afraid of. Borrow or buy a spring compressor, follow the directions, use common sense, and you're highly unlikely to hurt yourself. Now go forth and strut your stuff. --Rob
Read more

Chillin' Louie: To Coldly Blow (Part IX: Firing it up, buttoning it up)

thehackmechanic, July 11, 2021

16817 views   5 comments

Okay, with the compressor and bracket, condenser and fan, evaporator assembly, receiver-drier, hoses, and wiring installed, it was time to fire it up, then button it up. Similarly, with the project itself complete, it's time to button up this series of articles. As such, this is a long piece that touches on a number of topics. Leak detection There's a whole chapter in my a/c book devoted to leak detection, and specifically to the use of nitrogen or other dry inert gas to pressure-test. My philosophy of a/c rejuvenation in vintage cars is that if you flush out the evaporator, use new components for everything else, build new hoses, fill the compressor with the correct amount of oil, put it all together, and leak-test it, you know you're starting off with a clean, leak-free system, and it'll simply come up running. That little blue adapter between the pressure regulator and the yellow service hose in the photo below is a ¼" NPT to ¼" 7/16-20 SAE adapter. You can find it on Amazon. Connect the manifold gauge set to the charging fittings of your car, the yellow hose to the nitrogen bottle, open up both valves on the service port fittings, open up both the blue and red knobs on the gauge set to allow nitrogen to flow into both the high and low sides of the system, slowly raise the pressure to 100 psi (or 120, which is the limit on most low-side gauges), then close both knobs on the gauge set and on the nitrogen bottle and let it sit overnight. If it drops by more than one psi overnight, you're deluding yourself if you don't think there's a leak. But if it doesn't budge, it's tight. Consult the book for reams of detail. Nitrogen bottle and manifold gauge set for pressure-testing I had a nice example of the utility of pressure-testing with Louie. I hooked up the nitrogen bottle to the manifold gauge set and slowly increased the pressure. When it was at about 80 psi, I heard a loud hissing from the larger of the two brand-new just-installed bulkhead connectors. I grabbed the wrench, checked it, and found that I'd forgotten to tighten it. D'oh! I took a moment and checked the connector on every fitting on the a/c. Nope, it was just that one that I'd forgotten. I pressure-tested it again and found that it still leaked. I pulled it apart and found that, when it leaked the first time, it had blown out and misshapen its o-ring. Another o-ring, a fresh coating of Nylog Blue sealant (which I use on all o-rings and threads), and it was tight. I pressurized it to 100 psi and let it sit overnight. I the morning it hadn't moved one iota. That's pressure-testing. That's how you know you've got a tight system. That's what you want to see. Evacuation Once you've got a tight system, you need to pull a vacuum for at least 90 minutes on it with a good vacuum pump. This serves two purposes. First, it removes ambient air so that, when you begin to charge the system, air isn't displacing the refrigerant. Second, by lowering the pressure, it makes sure that any moisture in the system is boiled off and sucked out. This is particularly important with R134a because moisture is absorbed by both PAG and ester oil and reacts with R134a to produce hydrofluoric acid, which can corrode the innards of your beautiful new a/c system. As with pressure-testing, connect the manifold gauge set to the charging fittings of your car and the yellow hose to the vacuum pump, open up both valves on the service port fittings, start the pump, then open up both the blue and red knobs on the gauge set to allow suction to pull a vacuum from both the high and low sides of the system. After 90 minutes, close both knobs on the gauge set, then shut off the pump. Some people use the vacuum as a leak test, but really it makes far more sense to pressurize, as when it's under pressure, you can find leaks by hunting for the sound, and, if necessary, spray soap solution and look for bubbles. You can't do either of those things when it's under vacuum. Vacuum pump connected to manifold gauge set Charge! Not to sound like a broken record, but, as with pressure-testing and evacuation, there's a whole chapter in my book devoted to charging, but I'm not a certified a/c technician. I use a combination of: Watching the gauges to see the high-side pressure rise Watching the discharge line from the evaporator to see the metal fitting begin to sweat Watching the vent temperature thermometer placed in the evaporator blower vent to see when it drops to a reasonable setting Driving the car This time, with Louie, there was an additional variable: I'd bought a case of cans of R134a on Amazon ($68, less than six bucks a can) without knowing what that meant for them to be "self-sealing cans." These cans are compliant with a recent California mandate that small cans of refrigerant must be self-sealing. R134a is not an ozone-depleting agent like R12, but it is certainly a greenhouse gas, and the self-sealing feature makes it so that the cans aren't single-use like they used to be and just leak out the refrigerant after they're punctured. This is actually a good thing for both the environment and for you the user, as previously, there wasn't an easy way to use just a portion of a can. But it does take a little getting used to. I spent the $14.99 and bought the proper Johnsen's California-compliant R134a dispensing valve that screws onto the top of the self-sealing cans. You need to read the instructions that come with the valve. First, the spigot is reverse-threaded, so you turn it left (counter-clockwise) to open it, which on the one hand makes sense because it's like opening a faucet, but on the other hand it's unlike every other dispensing valve where you turn it clockwise to extend the pin that punctures the top. Rather than puncturing metal, though, the California-compliant valve moves a flap in the self-sealing can that, once the pin is withdrawn, swings back into position and seals the can. Again, this is a good thing, but the can takes much longer to empty than it used to, which makes the charging process longer. I followed the instructions for the dispensing valve for the self-sealing cans to the letter, and it worked perfectly As I said way back in the introduction, part of the reason I bought this Clardy system is that I resurrected the one on Jose Rosario's car, and was very impressed with how, after shooting just one can of R134a into it, it blew cold. That was pretty much the case with mine. After just one can, I was seeing 200 psi head pressures, saw the connector to the bulkhead fitting start to sweat, and read 40-degree vent temperatures on the gauge I had sticking out of the evaporator vent. That was enough to make me drive the car (there's only so much you can tell in the garage with the car at idle). Under load around town, in 90-degree heat and high humidity, I continued to see 40-degree vent temps, and on the highway at constant throttle, it dropped to 36. It might well go lower with a little more R134a (ideally you want the evaporator core to get to freezing and the temperature probe/switch cycle the compressor on and off), but I've let it be for now. As the president said at the end of Independence Day, "Not bad. Not bad at all." Drilling drain holes The Behr system I'm used to requires a single drain hole in the center of the transmission hump under the evaporator assembly. In contrast, the Clardy box has two drains, one at each side corner, requiring the drain holes to be cut pretty conspicuously closer to the sides of the hump. They're hidden by the console's side panels, but I wanted to be certain the system was working, and that it actually needed both of the holes before I cut them. I temporarily ran each rubber drain hose into a seltzer can and ran the car in the garage for ten minutes, making the system look like a frat boy wearing one of those hats that hosts two cans of beer. The amount of water in both cans was substantial (it was very humid). Okay, two drain holes it is. My 5/8-inch hole saw made nice clean cuts through both the original carpet and the floor. If you have a replacement carpet kit, I wouldn't recommend this, as I've had strands of wool pull out of cheap carpet kits like the drawstring on a big bag of dog food. One hole... ...and its attendant drain hose. Wrapping the sweating fittings and expansion valve Of course, in addition to the bulkhead fittings sweating in the engine compartment, they also sweated inside the car, so, as I said in that installment, it was crucially important that I wrap them with that tarry cork tape that prevents humid air from coming in contact with them. Which leads me to the following story. Getting the metal fittings on the suction line wrapped was a pain. In 1983, when we were living in Austin, just after I'd gotten my first 2002 running well and looking good, I happened into a second one that had a/c. Unfortunately, though, it wasn't blowing cold. In my first book, there's a chapter titled "Redneck Wind Chimes" in which I describe how Tom, a friend of mine from work and a first-rate shade tree mechanic, diagnosed it for me as a bad expansion valve. I removed the evaporator assembly, opened it up, and replaced the valve. Some of the components and copper tubes inside of and coming out of in the evaporator assembly are wrapped in sticky tarry cork tape whose purpose is to adhere to the metal to prevent humidity in the air from condensing on them and dripping on the rug. I remember going to an a/c specialty shop to buy the tape, and finding that the roll was a little pricey. The proprietor said "Yeah, but if you're not a pro and don't do a lot of cars, it'll last you forever." Fast-forward to Louie. In wrapping the fittings, I used up the last of the roll of cork tape. I can't recall another consumable that took me 38 years to consume. I ordered another roll. Using the last one as a benchmark, the new one should take me to 2059. I'll be 101. Like sand in the big cosmic hourglass, when that roll is done, I'll know that my time on this plane is through. This roll served me well. We shall not see its likes again. I obviously still needed to wrap the fitting on the other end of the suction line, the one that comes out of the expansion valve. But I wondered if I needed to wrap the expansion valve itself. I didn't see any cork tape on the old valve when I took it off. I took the car for a short drive in hot humid weather, then checked the valve. Condensed water was streaming off it onto the rug to the right of the accelerator pedal. No doubt of what was needed here. It's a wrap, wrap-wise. Hose rubbing While running the hoses behind the zero-clearance-room area behind the evaporator assembly, I found that the little metal plate on the right side of the heater box was digging right into the suction hose. Without giving it a second thought, I drilled out the rivets (or the tops of them anyway) holding the plate to the heater box to remove the little plate. Plate gone! Problem gone! This could not remain. One problem solved, but another one was created. But when I went to button the system back up and reinstalled the glove box, I discovered a problem. I hated the way that the hoses and fittings looked, emerging through the center of the footwell like they did. Then I remembered: There was a thin trim piece that lived under the glove box. I test-fit it, and found that its left side screws into that metal plate I'd removed. D'oh! Even once I reinstalled the glovebox, those hoses and fittings were still visible beneath it. I drilled the rivets that previously held the metal plate completely out, and after verifying that I wasn't about to screw into the heater core, was able to screw the trim piece directly to one of the holes on the side of the heater box and hide the hoses. Rivets gone Oh god that's much better. Buttoning up the console Spinning vents: The vents in my faceplate had no resistance to them, spinning freely without holding a specified aiming angle, so before I installed the faceplate, I did a little surgery. Risking shattering the 45-year-old plastic, I carefully pried the little dowel out of where one end of each of the vents went into the faceplate, inserted a little rubber grommet over the dowel, and put it back together. One at one end of each vent was sufficient to hold them in place when aimed. I was proud of this bit of hack engineering. Bracket and ashtray: I said earlier that buying the full-up Clardy system also bought me the part I didn't know I needed—the bracket that screws to the underside of the dash and hosts the faceplate. I installed the bracket early in the process, not understanding its interaction with the original assembly that holds the ashtray, the hazard switch, and the rectangular surrounding faceplate. This assembly must first be screwed to the bracket, then the pair attached to the underside of the dash. Bracket attached to ashtray assembly. The plastic tabs that would normally host slide-on nuts shown at the top were broken, but the intact captured nuts for the machine screws shown at the bottom held it on fine. Ashtray assembly and bracket test-fit into console faceplate. Revisiting the anatomy of the Clardy "console": I talked about this in one of the other installments, but it bears repeating. Both the original 2002 non-a/c console and the Behr console are hard-sided pieces of rigid particle board-like structure, the two sides of which are attached to each other with a metal bracket which is then screwed to the transmission tunnel. This rigid structure then supports the ashtray assembly, the radio, and in the case of the a/c console, the faceplate. But the Clardy system simply isn't like that. There's not a rigid structural console like the Behr system. Instead, the faceplate itself is the closest thing to a rigid structural member. The two side pieces that hide the evaporator assembly are flimsy plastic that simply screw to the sides of the faceplate and each have a single retaining screw preventing them from literally flapping back and forth. And, unless I'm missing something, the shift surround isn't attached to the "console" in any way. Faceplate and shift surround without driver's side piece... ...and with side piece. Without the screw in the bottom, it flaps into the accelerator pedal. It's really pretty flimsy. The retaining screw for the right side panel literally screws into the housing of the blower motor. Don't use a screw that's too long. I'm totally not kidding. If this is beauty, it's less than skin-deep. I raise this because it's necessary to understand it in order to understand... Installation of the shift surround: When I threw the "console" into the car, I mounted the faceplate in the bracket. It's basically held there by its curved bottom resting on the transmission hump, the rectangular area for the vents sliding into in the rectangular evaporator outlet, and the fan and temperature controls going through the holes in the bracket and, when tightened, squeezing the two together. But I didn't understand the attachment of the shift surround. It was the last piece that I installed. The Clardy console reuses the original shift surround (the trapezoidal piece that the rubber boot attaches to) just as the Behr console does. But unlike the Behr console where the side pieces go all the way to the back of the shift surround, the Clardy console uses two short pieces that screw to the sides of the surround. But there's absolutely no attachment between the console and the shift surround and its side pieces. This is visible in the photos above and below. So when I first drove the car, the shift surround moved all over the place, and the back of it lifted up when I shifted into 1st and 3rd. I don't have the pages from the Clardy manual describing the installation of the surround, but I assume that the slot in the front of the surround is supposed to be screwed to the transmission tunnel just like it is with the non-a/c console, The problem is that that the 10mm-head screw that holds the front of it down is underneath the part of the part of the faceplate that juts out. So in terms of assembly order, really, the shift surround should be installed first and screwed down in front, and then the faceplate should be installed and slid on top of it. As I'd just gotten the faceplate installed and everything, including the radio, wired up, I didn't want to backtrack, so I tightened the front shift surround screw down partway, then slid the surround forward in its slot. That worked well enough. This was a bit of a surprise. But the back of the surround still lifted up when shifting. Without having the Clardy installation instructions, I cobbled something together. I took the bracket off the original non-a/c console and screwed it to the transmission hump using its original hole location. If this looked like it was meant to be there, it's because it was and it had been. Now, on the original non-a/c console and the Behr a/c console, remember that the console side pieces are rigid, they screw to this bracket or one like this, and the shift surround in turn screws to the rigid side pieces, but the Clardy "console" just doesn't have that structure. I test-fit the shift surround over the bracket I'd screwed to the hump, saw that its slots and slide-on nuts were directly above the ends of the bracket, and fabricated some short intermediate bracket pieces out of a leftover universal condenser bracket. I nut-and-bolted them at the bottom to the bracket, and used the same screw holes that the short Clardy surround side pieces use at the top. This did a perfect job of holding the back of the shift surround down. I was quite proud of this as well. If someone can tell me how this is done on a dealer-installed Clardy system, or on the ICE AC system, or on the KoggleWerks console, I'd love to know. Patina: My goal in this was to have the end product look like it's always been there—to have its patina match that of the car—and I think I succeeded in that goal. It's done, it's installed, and I think it looks pretty good. If I had a beautiful car in which I was doing an a/c install, I might be swayed by the newer-looking KoogleWerks console, but in Louie, it'd look too new. I still think the sweeping curved lines of the Behr console are more in harmony with the lines of the dash, and that the Clardy looks a bit oddly angular and blocky, but at least it looks aged-in. I am pleased. Post-Installation Issues Low vents: The vents on the Clardy evap assembly aren't at the top like they are on the Behr system. They're in the middle. As such, it really doesn't aim at your face; it more hits you in the chest. It's manageable. Someone commented on an earlier post about installing a triangular wedge to force the air up. If I have to pull the system apart, I might try that. Spitting: Because of the close proximity of the evaporator core to the vents, this Clardy system spits a fair amount of humidity. I don't find it problematic—hell, it's almost even refreshing—but it is unusual. No other vintage a/c system I've ever had has done this. If I drove around wearing expensive linen suits, I might be concerned about staining. A piece of screen installed on the inside of the vent would probably solve the problem. Alternator: I haven't directly measured the draw of the Spal 30101505 condenser fan, as I still haven't found my old VDO ammeter, but its published spec is 13 amps, so it doesn't surprise me that, with the a/c on and the engine idling, the alternator is totally dragged down by the load, getting as low as 11.6 volts according to my el-cheapo cigarette lighter voltmeter. At highway speeds, though, it seems to keep up okay, with voltage in the low thirteens. The alternators on tiis are a pain to replace, as the injection pump is mounted where the alternator usually is, so the alternator is mounted low, requiring you to either disconnect the sway bar or remove the battery tray to get it out. I have a higher-amperage rebuilt tii alternator. Prior to the next long trip, I'll probably bite the bullet and install it. Waaaaaaay too low at idle, but it came up to fairly normal levels with the engine RPM up. The money Projects like this always cost more than you think they will. Even if you get the major components inexpensively (as I did with the $250 full-up Clardy system, and re-using an old Seltec compressor), in order to get it installed and working, it needs what it needs, and it adds up. Just for fun, here's the total. The bill for hose and fittings is higher than was required because I bought 10 feet of #10, #8, and #6 hoses, and I bought extra fittings in case I ruined some, and so far I've only used one can of R134a from the case of 12. So maybe you could say the total is closer to a thousand bucks. And, if you don't have to deal with retrofitting a/c into a tii and absolutely needing that tii-specific a/c crankshaft hub pulley (if you can find one), that was a quarter of it right there. used Clardy system $250 tii a/c hub $250 ester oil $16 flush $18 expansion valve $10 spal 30101505 fan $84 misc hardware $7 condenser and brackets $79 plastic sheet to fix faceplate $9 derale mounting $8 another mounting $8 hose and fittings $145 grommets $14 drier $19 case of R134a $70 California can tap $14 bulkhead fittings $34 #10 short drop fitting $12 more fittings $37 nylog $11 radiator port reconfig $65 cork tape $19 total $1,180 To Coldly Blow... So that's it. Louie is chill. I can jump into the car and either go for a stress-busting drive, or run out to pick up take out or a quart of milk, and not come back feeling like I've just done 20 minutes on the elliptical machine. And that was the whole idea. If you enjoy your simple, non-air-conditioned 2002, more power to you. But to me, having working a/c in these vintage cars substantially extends my use of them during the summer, which in turn dramatically increases my enjoyment of the cars. --Rob (My a/c book Just Needs a Recharge: The Hack Mechanic Guide to Vintage Air Conditioning can be purchased here on Amazon, or personally-inscribed copies of it and my other books can be purchased directly from me here.)
Read more
Books by The Hack Mechanic
- The Best of the Hack Mechanic
  By Rob Siegel
- Memoirs of a Hack Mechanic
  By Rob Siegel
- Just Needs a Recharge
  By Rob Siegel

×

×

Create New...