TQ: Engine vibration

[PaulHere]

Can anyone offer any further assistance to Neal?

My 1984 924 suffers from a knocking noise over bumpy roads (especially when turning) which appears to be due to the exhaust manifold hitting the steering column. I can see the wear marks on the column and have tried the other obvious solutions (new shocks, ball joints, bushes etc.). Could you possibly advise me what is required to replace these - ie will my mechanic be able to do it or does it require the engine to be removed ?

Neal Williams

 

[frankydoom]

Motor mounts is the culprit .................not sure how easy it is on a 924 - to long ago i did mine but had the same problem ............

 

[vincematthews]

Yes the engine mounts are the problem and probably only the one on the driver's side (RHD). It can't stand the heat of the exhaust manifold and the spring inside the mount fatigues and breaks. However it is worth replacing both if you are doing the job anyway.

Replacement of the mounts can be done with the engine in the car, you'll just need to support (all precautions observed of course) the engine on a trolley jack so you can move it side to side as necessary to gain access. Driver's side one is a bit of a pig to do and you'll need access both from above and below. Passenger's side is easy [].

Have a close look at the steering shaft to make sure any damage is only superficial. I've had the UJs on the shaft lock up on me while going into a parking bay - I could only go where the car wanted to go after that . . . which is not good and potentially embarrassing.
-

 

[vincematthews]

ORIGINAL: Berks924

I have checked the engine mounts and the rubber on the RHS one has split, presumably because of it's proximity to the exhaust. Is it possible to access it without removing the exhaust manifold or does that need to be removed first ?

The Haynes manual does not mention the engine mounts or how to replace them.

Neal Williams

Yes, you can change RHS mount without removing the exhaust manifold. See my comment above about putting the engine on a jack to move it to the side enough for access. I wouldn't recommend taking off the manifold as the chances of doing so without shearing a stud and having to remove the head to remove whats left, are not very good.

Let us know how you get on . . . ?