Heater Hose Routing

[82BMW633]

We have the engine and transmission in the car, finally. This is a build from a body shell and spare parts.  Have a hose kit from FCP Euro. Everything fits with the exception of the driver’s side hose from the heater box to the intake manifold. I know the hose is correct but it seems too long. It also seems to interfere with the throttle linkage. At least I think it goes to the side of the intake.  Any photos would help. Searches here and in Google don’t show what I need. Thanks. 

[man_mark_7]

I will be watching this thread with great interest. I recently installed dual DCOEs on an IE manifold. I used the IE manifold heater bypass kit w/ a silicone hose that connects to the driver side outlet of the heater core. I ended up having to install a 3" extension, hidden in the windshield plenum, to find a heater hose routing that didn't interfere with either the DCOE fuel lines and/or the @halboyles Ti-style throttle linkage.

[Mike Self]

If you have a standard one or two barrel (OEM) intake manifold, and if you have the proper heater hoses, the main trick is to place the throttle linkage's vertical rod and its return spring so the spring's hook doesn't foul the hose.  

 

Since you are doing an "assembled from parts" car, be aware that there were two different heater cores, each with different-sized nipples, and thus the hoses are different diameters.  Also the two barrel manifold and one barrel manifold have the return hose takeoffs in slightly different locations as well as the diameter difference, so you need to insure that manifold and heater core are compatible, or you'll have to do some jury rigging.

 

mike 

[82BMW633]

Two-barrel manifold with a Weber. Hose fits the heater core and the manifold. 

[Son of Marty]

If all else fails maybe you need this part.

 

[John76]

Return hose from heater should be tight against firewall so it does not interfere with the throttle linkage.

Also make sure the hook on the spring does not pierce the hose.

 

[82BMW633]

It seems I might have the wrong hose. When routing it according to the info here there are some slight kinks. Other sources have said the hose I have is an earlier model and that’s why it’s too long (the early one also connects to the manifold in a different location).  I’m sure we checked for fitment on a ‘75 when the kit was ordered.  

[calw]

I bought heater hoses from W&N.  The return line matches online photos of just the hose when you search by P/N 64211354306 - and it is not like what's shown in the photo above.  It is flat in one plane, with two 90 degree bends and is listed as for all carb cars from 1971 onward (I assume the date relates to when the heater core in/outlets were enlarged).  It really doesn't work without some un-natural bending, and is too long.

 

I also have an IE kit of silicon hoses that I got with a craigslist parts lot, which included a hose which DOES look like the photo, with additional bends to get 'round the throttle linkage.  I have no idea what it's corresponding BMW P/N would be or even which IE kit/vintage it came from.  

 

The hose in the photo is marked with the P/N 1356170, which shows up online also, including by number in realoem.  BUT, when you drill down in realoem, it never shows in one of the diagrams.  No idea what this means either.  You can find that P/N by it's full name 64211356170 from some of the usual online vendors.

 

Perhaps the extra length of  64211354306 is to allow us to force it into a functional position, but when I tried it every which way the best of orientations produces a pronounced kink in the lower curve to the back of the manifold.  I was able to find a photo somewhere online of an installation that looks like it had done the same thing.  I'm going to use the IE hose, it fits better... 

[2002iii]

When ordering parts for a 45 year old car you will run into a lot of parts that aren't quite right or completely wrong. Always double check before buying. I look up all part numbers on realoem.com . it also helps to buy from 2002 specialists like Blunttech.com , ireland engineering, 2002ad.com , Maximilian importing,  walloth nesch , etc.

[jp5Touring]

I have 40 DCOE's with the Ireland Eng.Water Bypass kit and halboyles ti throttle linkage.  

The connection at the throttle linkage and the long vertical rod is very tight fit for sure.

I had to tweek the ti linkage,the long rod and the lever at the pedal box .

For me I wish the hose was a half inch longer out of the firewall then make the 90° turn would give you plenty of clearance.

Pictures show how tight it is.  Its been installed all Summer and shows no sign of rubbing on the hose,wich seems hard to believe.

 

 

 

[man_mark_7]

12 hours ago, jp5Touring said:

I have 40 DCOE's with the Ireland Eng.Water Bypass kit and halboyles ti throttle linkage.  

The connection at the throttle linkage and the long vertical rod is very tight fit for sure.

I had to tweek the ti linkage,the long rod and the lever at the pedal box .

For me I wish the hose was a half inch longer out of the firewall then make the 90° turn would give you plenty of clearance.

Pictures show how tight it is.  Its been installed all Summer and shows no sign of rubbing on the hose,wich seems hard to believe.

 

 

Exactly the same issue I had. I installed a male/male coupler with an extra 3" of hose inside the plenum to bump the bend of the IE silicone hose away from the linkage.

[jp5Touring]

2 hours ago, man_mark_7 said:

Exactly the same issue I had. I installed a male/male coupler with an extra 3" of hose inside the plenum to bump the bend of the IE silicone hose away from the linkage.

Post a picture if you could please.  

[John76]

16 hours ago, jp5Touring said:

Its been installed all Summer and shows no sign of rubbing

 

Did you try the "rub test" with the heater on?  That hose might swell a bit when flowing hot coolant...just a thought!

[jp5Touring]

5 hours ago, John76 said:

 

Did you try the "rub test" with the heater on?  That hose might swell a bit when flowing hot coolant...just a thought!

Valid concern I think, no I haven't.  My biggest concern is the engine movement of just driving the car.

I would think a hose coupler could add a half inch and that would be plenty of room.  

Add that to my winter to do list.🙂

[man_mark_7]

20 hours ago, jp5Touring said:

Post a picture if you could please.  

 

I slapped this rig together rather quickly. I needed to get the car inspected before the end of Dec. and had to squeeze in the inspection between snowstorms with salt on the roads!

 

Too much going on in this small area. I need to fix the fuel line / heater hose contact but for now it's streetable. Pic of coupling in heater plenum (with way too long hose clamps) follows.