Quote:
Originally Posted by Carlo(s)
Thanks Benztech. Another ?; can scratches on camshaft be polished? no cam lobe wear at all just some scratches from past lack of lube. Engine oil pump screen and cranckshaft in beautifully clean condition after 141,000 miles.
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The cam lobes have a very thin what I believe is called a 'case hardened' surface, which means that you cannot polish out the unscratched surface area without going through this thin outer layer of hardened metal. To do so would obviously remove the hardened surface and expose the lobe to greatly accelerated wear as the rocker (also hardened) bears against it.
Having said that, I once tried this on a former 450SE cam, which had ground a huge gouge in the rocker (tic tic as the lobe passed over the 2 edges of the gouge). I put a new rocker in and lots of aggressive moly break-in lube on the new rocker and worn cam lobe. It did solve the problem, but for how long I can't say as the car was sold not many miles after.....