Re: More crank bearings

Posted by scott#2 on January 11, 2005 at 20:37:38 from (138.88.108.196):

In Reply to: More crank bearings posted by CNKS on January 11, 2005 at 18:19:12:

Cranks need to be ground whenever you feel uncomfortable putting it back together the way it is. I dont know the wear limits on the journals, but if you want an engine to run HARD all day, the bottom end needs to be precise for obvious reasons. Shims can be used at times but unless its a "hard" brass or other material, over time it can "beat out". If it were me and I wanted a work horse that I didnt have to think about, I would grind/replace if possible. If its on the wear limit and wasnt doing much HARD work, I would let it go. An out of round journal will increase wear, especially if you have more than one. A loose, rotating mass will eventually beat the bores in the block out of round as well. Then an align bore is in order. Yet another expense. You can pay now or pay later. There are fine lines between new, ok and broken. New and ok about .003 - .006" as you say (limits). Ok and broken/spun can be as little as .00015".

Its a tough decision.

scott#2

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