W108 two peice drive shaft - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 05-26-2013, 10:18 AM Thread Starter
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Date registered: Jun 2012
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W108 two peice drive shaft

I had my drive shaft rebuilt(new u joints and center bearing and such) and for my my 280se 4.5 v8 auto. now I have a subtle vibration from 30-35mph. now if they got it together misaligned are there marks to realign everything or am I going to have to get the shafts rebalanced??

David
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post #2 of 3 (permalink) Old 05-26-2013, 11:55 AM
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David,

Are you able to take it off yourself and inspect it? I personally don't trust "professionl" mechanics because I have seen the messes they make.

I have not personally seen a MB 2-piece driveshaft, but one of my domestic vehicles, a Dodge van, has one. I have personally replaced the U-joints and center support bearing and here are some of the things that could have been done wrong:

1. Driveshaft halves not put back together in the proper phasing.

2. Needles in U-joint cross displaced if U-joint was handled roughly during cross end cap installation into yoke(s) and/or hammered together. If even one of those needles is dislodged the cap cannot be fully installed. Those caps have to be pressed apart and together, no hammering. I don't know what the "professionals" use but I use a large C-clamp and that works well.

3. Snap rings that retain cross end caps not correctly seated in grooves in yoke(s).

4. Yoke(s) deformed by excessive force in removing/installing cross end caps. When the caps are pressed out, the side of the yoke where the cap is being pressed from must be supported or it will be damaged.

Driveshafts and universal joints are extremely durable but precision parts however careful assembly is required. My bet is that if you remove it and carefully inspect the U-joint phasing and cross end cap and retaining snap ring installation you will see the problem.

Ray W
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post #3 of 3 (permalink) Old 05-26-2013, 08:43 PM
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while you have the driveshaft off check the front flex coupling for distortion or uneven compression shape ,as this lets the end wobble .
Reinstall everything finger tight , roll the car forward and back a couple of times , final roll in forward position then tighten the centre drive mounting nuts followed by rest.This resets the correct length of the drive shaft slide ,if done on the ramp the driveshaft will have a vibration.
best
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