Quote:
Originally Posted by mplafleur
The cams lobes should be rounded and smooth. The FSM mentions that flat spots are an indication of cam wear. Flat spots will show up as a point, or line across the face of the cam.
I don't know however how flat an area should be before replacement is necessary.
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As the cam lobe wears, it will be unable to lift the valve fully. I think the FSM provides wear limits based on measuring the long dimension of the cam lobe. If the cam is surface hardened, wear will accelerate as the hard face is worn through. If the rest of your engine is happy, keep an eye out for a parts engine.
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