Strange Noise

[Stewart Loy]

Throw Out Bearing Noise

I am restoring a 1942 Chevrolet CMP GS truck. The original engine was replaced with a direct swap 261 – a 1962. When the engine was rebuilt, I put the old clutch, pressure plate and throw out bearing behind it. The whole unit dropped into place without a hitch.

The engine was a bit noisy until I got the lifters set up now it runs well.

The problem I have now is when the clutch is depressed it sounds like a bad bearing.

I have replaced the throw out bearing twice in the past 3 days. The first one made no difference, so I asked a mechanic friend about this. His reply was that it was not uncommon to get a bad one – so I swapped it again. The same noise when the clutch is depressed.

I have the transmission out now – the shafts all feel OK, little wear on the input shaft. The clutch fingers are all flat, and everything seems bolted up how it is supposed to be. The bushing in the back of the crankshaft is OK. But it still growls when the clutch is depressed.

Does anybody have any idea what the problem is, and how to fix it?

Thanks,


Stewart