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Babbit flakes and cracks..babbit is tinned to the bearing caps but pinned to the block,dont be alarmed if the babbit is 'loose' on the block side.
The hydrodynamic principle applies,.001 inch clearance per inch of journal, so an oil clearance of .0015 is optimal, though .002 to .0025 will work. Shims can be used if the bearing is tight, main caps can be sanded (evenly) if the bearing is loose. Plastigage is easy to use to check the clearance. When fitting mismatched bearings is important to use prussian blue or impression fluid to determine high spots across the bearings, and scrape them to true..
Fitting bearings is an art, not a science.. don't ship a bound crank, keep check and fitting till it turns free.by the same token, dont ship a crank thats too loose,if its above .003 it needs sanding at the minimum, repoured at the worst..mains poured by a reputable shop price varies,out here in the peoples republic of california it cost 750 the last time I had it done.
I have 6 a engines, 1 b and 2 diamond b's..the diamonds stay,the rest can go..
