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Hi to all , i have a 1985 coupe quattro b2 with a drivetrain related vibration.
The story so far :
Initial fault was a Dry squealing centre bearing on the prop .
Work done ,
Replace centre bearing , uj joint as notchy, both end cv joints and sent away to be professionally balanced. I've now got a big vibration from 25mph upwards with various degrees of severity as speed increases.
The centre support carrier brackets on the body have been mullered and at some time has been repaired so i have no original points to recall for reattachmnent, although i have tried different positions left right and spacing from body with no change.
When the car is on the ramp with the wheels removed and the rear driveshafts out /disconnected so only the prop and diff spinning i still get the vibration through the car . I can actually feel it through the seat !
If i listen with a stethoscope the front prop area seems relatively calm but as i move to the rear especially on the diff body centre area i can detect a very prominent thudding at various frequencies and the diff physically moves about suggesting that the diff is causing the problem . The prop appears straight and when it was refitted it was refitted using a homemade jig .
The diff oil level was correct and there was no swarf
Could something in the diff cause this ?
Would driving the car at high speed with the rear wheels locked on tarmac damage the diff which could cause this ? ( possibiilty that the mechanic did this but wont admit it !)
Oh and while this work was being carried out the gearbox was dropped to gain access to a stuck slave cylinder in the gearbox housing .
Its a real shame as the car actually had very little vibration before i messed about with it !
The story so far :
Initial fault was a Dry squealing centre bearing on the prop .
Work done ,
Replace centre bearing , uj joint as notchy, both end cv joints and sent away to be professionally balanced. I've now got a big vibration from 25mph upwards with various degrees of severity as speed increases.
The centre support carrier brackets on the body have been mullered and at some time has been repaired so i have no original points to recall for reattachmnent, although i have tried different positions left right and spacing from body with no change.
When the car is on the ramp with the wheels removed and the rear driveshafts out /disconnected so only the prop and diff spinning i still get the vibration through the car . I can actually feel it through the seat !
If i listen with a stethoscope the front prop area seems relatively calm but as i move to the rear especially on the diff body centre area i can detect a very prominent thudding at various frequencies and the diff physically moves about suggesting that the diff is causing the problem . The prop appears straight and when it was refitted it was refitted using a homemade jig .
The diff oil level was correct and there was no swarf
Could something in the diff cause this ?
Would driving the car at high speed with the rear wheels locked on tarmac damage the diff which could cause this ? ( possibiilty that the mechanic did this but wont admit it !)
Oh and while this work was being carried out the gearbox was dropped to gain access to a stuck slave cylinder in the gearbox housing .
Its a real shame as the car actually had very little vibration before i messed about with it !
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