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Old 06-16-2010, 04:56 AM
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spun bearing fix????

Hi
I have a 304 Australian v8 which has spun a bearing the crank will need replacing but the rod measures up ok so i will reuse it. What Iím wondering is if i can get away with just cleaning the engine without removing the lifters, cam heads etc... and then drop a new crank in or do i need to strip down to a bare block.
Whatís the normal practice for a spun bearing???

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Old 06-16-2010, 07:05 AM
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Stripping it all the way down and cleaning out the oil galley`s to make sure all the metal from the bearing is gone is what I would do. When the particles get in the oil they go everywhere the oil goes and they can take out parts with it. Since you have to tear it down all the way, you may as well rebuild it. Even if the rod checks out okay I would still have it resized and checked.
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Old 06-16-2010, 08:50 AM
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Yep thatís about what i thought i would have to do.
I was hoping there was an easier way, apart from the spun bearing the rest of the engine if fine, just changed the cam and went to solid lifters before it let go. I guess i will have to strip each lifter down and clean them out as well or is that going too far?
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Old 06-16-2010, 09:45 AM
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Might as well go all the way so it's done right. Really, how much more work is it to take out the cam, lifters and what not?
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Old 06-16-2010, 02:54 PM
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There is no way that a spun bearing doesn't hurt the rod, no ifs, ands, or buts. It may look fine but you can bet it is oversize or out-of-round, or both, now. If you are lucky it is intact enough to resize.

You are asking to have it happen again if you don't have the rod resized.. I would have all the rods checked and resized, one has had a problem so now all are suspect. Could be another that is almost ready to fail now, and you put it back together only to have it fail.

Bearings don't just spin for no reason, have you determined the root cause of the problem?? Lack of oil , dirt or debris damage, rod out-of-round or without enough bearing crush, bolt stretch or fatigue, or ??.
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