Replacing main bearings without removing the crank

nm9stheham said
You just gotta be careful that you don't scrape some metal off the back of the shell on a sharp edge and have it caught in the bearing ends or between the cap and block; or get some crud behind the shell, which will mess up clearances. Personally, I am with Del and would not bother without pulling the crank unless it was an emergency to just get things going.
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Again, not saying this is the best way to do it, nor am I suggesting any certain way. Just showing how to do it without removing the crank, because it's been mentioned in a few threads lately. However, I've replaced mains without crank removal and had no issues