if its not to bad you might be able to turn the crank down at a machine shop if you are trying to produce a lot of power thow that would not be a good ideal the more you turn a crank down the weaker it gets plus you would have to use oversizes bearings.you rod id(inside diameter)might not be rite or you bearings are to thin.i have seen some wired shit when i used to work at a machine shop.is the crank dark like it spun a bearing or no oil(plugged oil hole).hope it all gos good.shit never mind you posted all that info up top.so you just going to get a new crank then hu.