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Need Help-2002 half shafts


chad

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As far as I know there is no inner/outer CV joint and no directionality to the half-shaft itself. I had a box of CV's and never kept track of which one went where. My 320i half-shafts are asymmetric in that they have some raised ribs on the shafts that are more toward one end than the other, but the car does not care about this.

--Fred

'74tii (Colorado) track car

'69ti (Black/Red/Yellow) rolling resto track car

'73tii (Fjord....RIP)

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I was once warned about re-using CV joints that were swapped for reverse rotation from their original position. The inner balls get worn in a certain pattern to the inner and outer "cages" and may fail prematurely if used on the opposite axle side (rotation).

I recommend marking them before removal from the car for disassembly and cleaning. Use plenty of disposable gloves before attempting this job.

Jim Gerock

 

Riviera 69 2002 built 5/30/69 "Oscar"

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Interesting point, I had never heard that. Based on some quick Internet research, it does make sense to keep all the components of each CV together, and not mix and match. When I rebuilt mine I pulled each CV apart and carefully inspected them--all of the balls looked fine on the ones I re-used. Putting the balls and cage back together is a bit like doing a rubics cube, there seems to be only one orientation that makes it all go back together easily.

Here a a few interesting articles from the web:

....some people recommend switching the joints from left to right and vice versa on a periodic basis. This is due to the fact that wear on the joints tends to be directional, based upon the loading imposed during forward travel. By swapping the joints to even the wear their life can be extended. Since new CV joints from Porsche cost approx. $150 each and there are four CV joints this seems like a worthwhile idea

http://connact.com/~kgross/FAQ/944faqcv.html

Here's an interesting article that does not address the question at hand, but indicates there are off-roaders that are scouring parts lots for used 2002 CV's!

...With second hand CV joints, you can never be certain whether a joint has been reconditioned or not (unless you measure the balls with a micrometer). CV reconditioners typically retro fit 0.50mm oversize balls into reground cross grooves, so you don’t want these parts getting mixed up with the balls from untouched CVs. For this reason, you should place all the parts from each CV into its own ice cream container, and work on only one CV at a time.

...Race CVs are fine tuned by lightening the exterior of the housing, and polishing and relieving the internals....The depth of the case hardening of the tracks is in the vicinity of 1.2mm to 2.5mm, so some grinding to a depth of 0.25mm by specialist CV reconditioners (to accept 0.50mm oversize balls) is possible, and light honing by racers is perfectly acceptable.

http://www.rorty-design.com/content/CV_joints.htm#Fine%20tuning%20the%20CV%20joints.

Another article on CV joint reconditioning:

....According to several rebuilders, roughly half the CV joints they rebuild are salvaged and reconditioned by grinding. Another 20 to 30 percent can be rebuilt using sightly oversize (.001 to .003 inch) balls and cages. An equal number often do not need much of anything except cleaning and reassembly with fresh grease. And only about ten percent are unrebuildable because they are broken, cracked or damaged beyond repair.

http://www.aa1car.com/library/cvgrind.htm

Fred

'74 tii

--Fred

'74tii (Colorado) track car

'69ti (Black/Red/Yellow) rolling resto track car

'73tii (Fjord....RIP)

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Not on a street car, no...

For highly- stressed applications, it's good to keep the twist

going in the same direction, because the stress reversals

'could' cause failures.

Given how understressed a 2002 halfshaft is, I never worry about it.

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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I'm sure you've heard of "axle wrap" where the axle twists from the torque applied between the two ends. This mainly applies to racing cars, but a 30+ year old car with questionable ownership may weaken the axles, stub axles and CV joints. I've seen this happen on FWD cars that have not had proper CV joint maintenance ("clack, clack, clack" when turning a corner).

Even a (relatively) low HP VW Beetle with similar I.R.S. set-up can break an axle. This exact thing happened to a good friend at an 1/8th mile drag race in the '80's. The lightweight car (69 pan with gutted 67 body) only had about 100hp and 5.5" wide slicks, but it snapped the left axle just beyond the inner CV joint on the starting line.

IIRC, the engine was 1700cc 10:1 CR with single Holley "BugSpray" 300cfm center mount carb.

Jim Gerock

 

Riviera 69 2002 built 5/30/69 "Oscar"

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