replacing rod bearing through oil pan... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-04-2008, 08:23 PM   #1
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i believe i isolated the lower end noise to be the #1 cylinder rod bearing. i pulled the pan and all the main caps and the bearings and crank looked fine. i did not see too much metal in the pan so i cleaned everything back up and put the pan back on and filled it with oil.

the knock, only present when reving the engine, was not present when i pulled the plug wire for cyl #1.

i am going to pull the pan again this week and pull the cap for cyl #1 rod. if the crank and rod itself look decent what are the chances of slapping a new stock sized bearing in it and getting some mileage out of it?
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Old 05-04-2008, 10:59 PM   #2
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was there anything abnormal in the oil pan?
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Old 05-05-2008, 10:25 PM   #3
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I've done that trick with other cars.

Why not replace all the rod bearings?
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Old 05-06-2008, 04:45 AM   #4
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If the rod is knocking, there is usually damage to the journal or the big end of the rod. In my younger days, I tried what you are contemplating with little success. Now, I pull the engine, put it on the stand where I can clean it well, and work in clean conditions. I let professionals polish or grind the journals and I take a lot of care fitting the bearings. That has worked out a lot better for me.
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Old 05-06-2008, 04:52 AM   #5
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I tried that and it failed horribly after....30 seconds of runtime I think. I would think replacing rod bearings PRIOR to failure will work out alot better...but not after one.

Still...if the knock was present with all plugs firing, and not when #1 is unplugged, that would indicate (to me anyways) the bearing itself is fine...it'* the connecting pin in the piston that'* the issue.
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