Engine whine

[JJDraper]

Worn cam bearings clatter rather than whine! I didn't really appreciate this until I fitted new cams & shells...

Jeremy

[rgh0]

If the rubber on the chain damping pad is worn then it may cause a whine if it is not guiding the chain correctly or if chain is contacting the metal backing strip or screws that hold it

cheers
Rohan

[david.g.chapman]

Well, I have had another look.

The slipper pad rubber looks OK with little wear. There is no bare metal that I can see. The pad fixing screws were well recessed away from the chain, and the chain has no rubbing marks.

As the chain passes very close to the start of the pad (looking down from the top) I bent the top of the pad away from the chain slightly with a long drift and club hammer.

Re-assembled the engine and started up but it made no difference .

I believe I have had this whine for some years, but it is only recently that I have noticed it more. My latest "theory" is that the chain itself is creating the whine, although it is only 25% worn from new.

As it it louder when the engine is hot, I will change the oil (due anyway) and add some Wynns additive - it can't hurt.

Thanks again for all your help.

Dave.