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  #1  
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Maxdog2 Maxdog2 is offline
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Default Replace crank bearings

Back again for some guidance. Rebuilding my first ironhead engine and when reading through the HD service manual I realized the crank run out check was forgotten during teardown. The bearings look good and I have always been taught a proven bearing that has been running is a good bearing, quality, installation, etc. are all good.

The engine and bike have 16,300K miles. While the cases are split should I replace the bearings or run what I have?

Thanks,

David
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man that thing is hardly broken in.
you can have a machine shop check the crank in a lathe. that is what i do when i put one together.
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put the assembold wheels on a bench and check for up & down play and side to side play with the rods straight up and down,crank pin on the top since they're already out out of the cases,any up & down play is a bad thing,side to side a bit is ok

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Presumably, the engine wasn't torn down due to an oil pump failure, seized piston, clanking noises etc. ie not a catastrophic failure.
Normally I replace bearings as a matter of course. But the crankpin is an exception because of the time/labor involved.
It certainly would have been easier to check before you pulled the crank but you can still do it now. There should be NO up and down movement. If you can feel it, it's too much.
If the mains are good the crank probably is OK as well.
Inless your doing a complete rebuild on an engine you intend to keep for another 50,000 miles I'd probably leave it. Just my opinion of course.
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Thanks for the suggestions. There was no up and down play and the side to side for the rods were in spec.
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