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Cam Wear
I am building a '42U engine and would like to use the cam set that came with. I am confused by what is considered acceptable wear/pitting on the cam lobes themselves---the shafts and gear teeth are fine. Basically , when are the lobes considered unusable? Thanks.
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It will always be a judgement call. How much springpressure will you run? How much hard service do you expect to put it to?
I use a common ***eler's eye loupe to look at the pits and see if there are any sharp lines of spalling: Kind of like crystal edges where the metal has fractured, rather than digested away from rust. Fine beadblasting must be used to clean it first, but the difference is apparent.
I do not believe that minor rustpits render a cam unserviceable.
But where do you draw the line at what is "minor"?
Please replace worn bushings and tappet rollers of course.
(Oi Vey! they bleeped "chew" from "chewelers") -
Opps sorry. Sons of David. My appologies.
It's a strange thing and needs refinement. I appreciate your patience.
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