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Debbie collins Posted on Mar 15, 2016
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Which rod bearings???????

I have a 2002 Chevy impala 3.8l v6. I need to know what are the best choices for rod bearings. I see standard, .o20, .030, ,01. Not sure

1 Answer

Bill Boyd

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  • Cars & Trucks Master 53,816 Answers
  • Posted on Mar 15, 2016
Bill Boyd
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What you are seeing are under sizes for bearings available for when the crankshaft is ground
you have to measure the journals with a micrometer to see it it is standard size or has been ground
or if you are just putting new bearings in during a quick engine rebuild then the bearing size will be stamped on the back of the shell
it will be either std or the .010" etc and you need the bearings with that size on them
anything else but std on a std crank journal will jam the shaft up--or .010" means that the crank has been ground .010" and needs bearings of that size
conversely if you put std shells on a .030" ground shaft , the bearings will flog out and oil pressure will be low to non existant

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I dont know wich bearing to get for my 2002 chevy impala 3.8l v6. Some are standard, some 0.0010, 0.0020, 0.0030 ??

You want to have approximately 0.001-inch of bearing clearance for every inch of journal diameter. So for a 2.100-inch rod journal, it’s always a good idea to shoot for 0.0021 or 0.0022 bearing clearance.Too little bearing clearance can mean a spun bearing, we always aim to wind up too high rather than too low.

If the crank has not been turned and is stock with no wear I would go with standard bearings. With wear you may be able to do the .0010 over. If the crank has been resurfaced then I would suggest measuring the diameter with a caliper or request the resurface specs from the machine shop.

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Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!
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