Drive shaft problem

Driveshaft Alignment

Tony:

The misalignment of the driveshaft in both the horizontal and vertical planes can cause this and the alignment procedure should be in the Blue Book shop manual. Basically a straight edge with four equal length tabs sufficient to clear the centre bearing support. The location of the tabs is determined by the centre bearing to contact the driveshaft in pairs on either side. Using this tool align the driveshaft in the horizontal so 100% straight and the vertical as close to straight as possible.

If you want absolute perfection you would align the engine and rear diff first/as well but this gets a little more problematic. I'll try to link the posting from the 2002faq .com on this as it is the same for the 02 as the CS.


Hope this helps,

Doug
 
driveshaft noise/imbalance

No Tony. Mine doesn't have these spacers.

It's likely the u-joints, center bearing, splined joint, or imbalance. Is the noise very fast or half speed? If you can tell the noise, it may help point to one device or another.

It's suggested that you get up underneath and shake the begesus of each of these items and or pry a little. Any play, movement, would indicate a needed repair. ( other than a little flex at the center bearing rubber only).

You can jack up the rear of the car and run it to observe if you carefully follow safety precautions.

Most shops would want you to simply replace the driveshaft or rebuild it at a specialty shop. But some owners rebuild theirs.

The driveshafts changed a little along the way- guibo- two types which gets down to 10mm or 12mm bolts. It will be the first question a specialty shop will ask if you go shopping.

Center bearings- same but lesser known- I guess that automatics had a smaller center bearing. ( good to know if your car was converted over to standard.) That's what I found on mine. It was just completely loose by 1 mm and sheared the retaining ring which was the noise I heard
 
Strange driveshaft vibration--

As 61 Porsche has hinted--one of the most overlooked sources of driveshaft vibration that fresh guibos and center support bearings will not correct or solve in the E-9 or E-3 for that matter--could be--

At 35-40 years of age our drive shaft u-joints original lube has often "dried out"--and there was no provision with the sealed originals to be lubed--the resulting binding or resistance to turn smoothly can introduce and produce strange vibrations--disconnect at the joint then "feel" for any resistance to its 360 degree designed range of motion--if compromised or resistance is present--time to have the shaft rebuilt and re-balanced with "new U's".
 
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The gearbox rubber mounting is 30mm high and on the other car it's 20 mm?

In the parts catalogue the center bearing is the same for auto and manual.

I have jack up the car and there is a "play of 5-10mm" at the center bearing at 40 km/h.

I shall check the alignment again.

Rgds/Tony
 
I replaced the guido and adjusted the bracket for the center bearing and it's OK now.
The gear shifts also feels softer.

Thanks for all help on this forum

Rgds/Tony
 
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