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Old 06-28-2005, 03:00 PM
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Rod bearing clearence?

If I use the EXACT bearing to replaced the worn bearing.

Is there a clearence issue I need to know about? Or do I just pop them in and torque to specs?

Sorry if this is a dumb question.

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Old 06-28-2005, 03:16 PM
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In most cases you`ll likely land on your feet and be fine, however, not knowing the specs can lead to disaster as well, especially if you don`t know the history of the engine. Anytime a engine is built, the specs should be checked, you can check the bearing clearences with plastigauge, anything under .001 is not enough and anything over .003 is too much.
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Old 06-28-2005, 04:05 PM
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question: why does the bearing need to be replaced?

wha happend?

tbw
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Old 06-28-2005, 04:35 PM
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messed up

Long story short. I have solid lifters, and didnt adjust them after initial startup. The nuts came loose on int and exh on cyl #3. Neither valve was opening. Limped it home, which I shouldnt have done. Retightened of course.

So I think the excessive cylinder pressure hurt the bearing.

300 miles later I get the knocking sound. Pulled the bearing. Its bad.

But no damage to crank or rods. So can I just replace it? The engine has 400 miles on it.
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Old 06-28-2005, 09:38 PM
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If the bearing is bad, then it is VERY likely that the crank is damaged. You need to take it to a machine shop and have it checked out. It will likely need the rod journal to be turned down.

Chris
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Old 06-28-2005, 10:46 PM
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bearings

Drag your finger nail across the crank. If you can feel any imperfections you have damage. Also mic out the rod hole. It may have went oblong. It might be taller than wider now. If it is, it needs to be resized.
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Old 06-29-2005, 09:10 AM
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Doesn't sound like the nut's cam loose. Sounds like the piston hit the valve and bent a push rod or something. Loose lash and a bad bearing on the same cylinder would not be coincidental.
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