Quote:
Originally Posted by JasonAndreas
Do you still have the damaged camshaft? Do you know any tribologists? Would you be opposed to sending it to one? I know they won't give you a diagnosis from a single photo but there doesn't appear to be any scuffing to go along with the pitting?
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I've seen this type of camshaft spalling/pitting in several different engines and have been told by engine design engineers that this is typical failure of the hardened surfaces. I tore a 2004 Jeep engine apart that had this pattern on several lobes but had a couple that were almost completely flat and totally worn through the hardened material on both the cam and the followers. Two lifters had worn so much they had holes in the bottom. There was no sign of scuffing on that cam either. Once the hardened material was completely gone, everything looked nice and smooth - almost polished.