Re: Spun bearing

Posted by captaink on June 22, 2005 at 07:24:51 from (66.115.214.56):

In Reply to: Spun bearing posted by Johann on June 22, 2005 at 04:55:50:

I’ll give you a few thoughts to ponder as you make your decision. First and foremost I believe is to determine why that bearing spun. You noted that you suppose that it was not installed correctly, but you really need to make sure. I say this because I found a spun bearing in an engine once and came to find out that it had a cracked block and anti-freeze was getting into the oil. The bearing was put in correctly, but I believe that since this was in a low usage engine the antifreeze caused the bearing to “stick” once and then it spun. I would suggest you have the rods checked at a machine shop to make sure that the bearing area in the rod is not out of round or otherwise distorted.

Those freckle faced bearings are that way from foreign material being imbedded into the soft bearing material. This foreign material was pumped throughout the engine including the cam bearings and oil pump. If only the softer bearing material was in the oil, there was probably no damage to the pump or other steel parts like the crankshaft, but if some of the backing shell of the bearing came loose, then harder steel filings may have caused damage elsewhere in the engine. Another thing to consider is that there may still be pieces of foreign material floating around in the oil galleys somewhere. I would also be suspect of the camshaft bearings looking like the crankshaft bearings.

I strongly suggest (especially if this is a newer rebuild) that you completely tear the engine back down and thoroughly clean and inspect the parts especially the cam bearings for filings or have it done at a machine shop. I would also strongly recommend having the crankshaft at least polished by a machine shop to ensure that there are no nicks in it from the material passing through it. I would consider these expenses cheap insurance so that your engine runs a long time after you are done. I had a bad experience once when I tired to “cut a corner” on an engine rebuild and lived to regret it…I like working on engines but not enough to do it over again right away! :>)

My nickels worth…good luck!

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