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Old 01-02-2003, 01:57 PM
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Post .001 oversize main bearings from factory

I am in the process of rebuilding an AMC 258 I6. As far as I know, I am the first person ever to pull the oil pan from this engine. When pulling the crank, I found that the main bearings were .001 oversize. The rod bearings were std. Would the factory have used the oversize bearings to tighten up the clearances? Just wondering, I will be getting the crank turned .010/.010 anyway.

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Old 01-02-2003, 02:53 PM
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Most factory bearings have the mfg. stamp on it somewhere. It's possible the factory did it, it used to be a pretty common practice for the factories to build engines with various undersizes to correct initial machining errors. Now days, I think they are afraid of a law suit from someone claiming they were sold a used engine in a new car.
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Old 01-02-2003, 07:46 PM
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when it comes to AMC motors you will just about anything in the way of bearing sizes from the factory, i've seen .0005-.017" plus and minus size bearings maybe on one journal sometimes on two or three, they want to use all of their cranks and not all are perfect, so you get odd repair sizes. not available in the aftermarket. Later model small block chevys have been getting odd size bearings from the factory also, anything to save the crank casting.
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