Mystery noise in 156 JTD following clutch & flywheel replacement
Fellow Alfa lovers & owners,
My 2003 156 JTD 1.9L has been performing beautifully (& I love it) until I needed to have the clutch replaced. I go to a reputable Alfa garage which charges 75 pounds/hour labour so I thought I was in good hands. Sadly the replacement clutch was found to be faulty (it juddered in first gear) and was recently replaced for the second time. I was advised to get the fly wheel replaced on it at the same time (at 750 pounds cost for the parts) and did so. Ever since then there has been a fairly solid knock that comes from the engine when I take my foot off or put it on the accelerator and it only occurs when I am doing about 50-60MPH and after the car has warmed up.
My mechanics initially advised me it was an engine mount which they replaced and it was not the cause of the problem. Then they advised me it was the wishbones which were also replaced and while this diminished the knock to some degree it is still present. The garage accepted they may have been at fault and pulled out the gear box again and checked over their work and have not found anything that could suggest why this is happening.
To explain the noise/knock more clearly - it only happens when the car is doing about 50-60MPH and only after I push on or pull off the accelerator. The knock is a single knock and it feels like something has come seriously loose with a lot of movement/play. There is no other rattle or noise and the car corners and handles really well. I have also had the roll bar replaced so it should not be that?
The garage now tells me that the steering rack is in question and there is some play in the steering wheel when the car is idle. However I can't get my head away from the coincidence of the noise with the coincidence of the clutch/flywheel replacement.
Any advice on the possible cause of the knock/noise would be greatly appreciated.