Strong bumps in the cardan shaft - Alfa Romeo Forum
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Strong bumps in the cardan shaft

Hello to everyone.

I've started breaking in period on my Q4 transmission.

The problem is a few strong bumps in the area of cardan shaft (it's rear part mostly) when starting. Only when releasing the clutch softly.

What I did already:
1) Clutch checked - everything's ok, flywheel and cover are balanced and good. The clutch itself is new

2) I've cheked the first shaft suppot (closer to the distribution box) - no play, rubber is mint etc...

What I can see is old rubber in the second support (located on the solid part of the shaft, that's inside a pipe). There's some play (up and down) in it. Could it be the reason?

The play on the shaft itself is few degress (when rotating with hand), the slots on the shaft's end are good... Usually when the play on diff is too big - it should be on big bump, and I have few and only when softly releasing the clutch.

I'm still fear that is can be the rear diff itself, but want to eliminate other suspects before ripping the diff...

And sorry for my english.
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As you said, probably the 2nd support is to blame, rear diffs can make lots of noises but if you have play on the shaft vertically that is unlikely to be the problem.

On the other hand all q4's do a small bump when starting slowly, you notice it mostly while parking (going forward and reverse), i doubt it but maybe that is what you are talking about?
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