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Replace Rod Bearings in Car?

 
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Old 02-28-2015, 02:19 PM
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Replace Rod Bearings in Car?

Well my plan to rebuild my b20a5 just went super low budget. Other expenses just ate up my budget plus some.
Can you replace the rod bearings without pulling the motor? I think I heard once that you can pull the oil pan and if you are careful, you can change the rod bearings without disassembling anything else. Is this possible?
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Old 02-28-2015, 05:51 PM
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Re: Replace Rod Bearings in Car?

YES! You can! I did on my car. Now, I had the head off, so I was able to push the piston back down from the top, but if you devise a way to pull the piston back down (Like using a slide hammer with a threaded fitting like the cap bolts) you can pull it back down into place. You MAY be able to pull the piston back down with your hands too. Just depends on the ring tension and lube on the cylinder walls.

All you have to do is remove the pan (And everything blocking you from removing it), remove the oiling assembly, rotate the engine to where that journal is down, unscrew the nuts, remove the cap, push up the piston with a brass punch or a hard wood stick... The handle of a quality hammer works well too, knock the old ones out, put the new one in the rod, pull it down in place, make sure it is aligned, then put the one in the cap and put it into place and then torque the nuts to spec. Then rotate the crank to the next piston and repeat the steps.

SO... Why do you want to replace them? I do need to mention that you need to check the journal for wear. Make sure none of them have spun.
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Old 02-28-2015, 08:03 PM
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Re: Replace Rod Bearings in Car?

I have developed a slight rod knock and my oil light flashes at me every now and then. While I'm in there I'll replace the oil pump too. I just need to keep it running and derivable until I get my truck moved here in May. Then, I can take all the time I need to do it on a slow budget.
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Old 02-28-2015, 10:43 PM
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Re: Replace Rod Bearings in Car?

Well then I think you are on the right track. I would do the same thing in your case. As long as the rod bearings are just worn and not spun, it should fix your knocking issue. If they ARE spun, maybe if the alignment/retention grooves are still good, the new bearings will stay put. Do you have the manual downloaded on how tight to tighten the nuts on the caps? I believe that the spec is 34 ftlbs but please verify.

I would like to suggest that you clean the oil pan out and the oil "galley" as well. (The oil feed tube assembly) because mine was all stopped up with "crud". I used brake cleaner and an air hose to flush it all out, back and forth, until the brake cleaner came out clear.

So that is my suggestion.
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Old 03-02-2015, 01:37 PM
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Re: Replace Rod Bearings in Car?

another tip would be to remove the spark plugs so you are not fighting compression
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