Quote:
Originally Posted by cruisen_15
well before the rebuild the crank had seen some high temps and eventually i spun a bearing so me and a buddy rebuilt it but we took the crank to a machine shop and once i picked it up they said it was bent so they balanced and straightend it... so im guessing between the wear before the rebuild and having it worked on at the shop this is probably why it broke
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I wouldn't ever reuse a crank from a motor with a spun main bearing unless there was no other choice. A spun rod bearing is usually fine, but when a main bearing goes it puts all kinds of weird stresses on the crank. I've heard it described as a "jump rope" effect by some builders.