Scored Main Cap Bearing - Ouch

pittsburghracer said

It could be the crap from the worn thrust bearing

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I'm sure that's some of it, but the big scoring looked like not enough chamfer on the oil holes.

I always chamfer the main and rod feed holes before grinding. And add extra chamfer because some of it gets ground away.

I will chamfer them if the crank is ground already, but I don't like doing it any more if I can avoid it. My hand isn't as steady as it once was.