Bearing crush is only used when installing new bearings.


To examine used bearings, measure the clearance using the plastigauge. If the measured clearance is within the spec range, they are good. Too much clearance and the oil pressure drops. Too little clearance and they could bind.

Datsun Factory Service Manual (see Bearings)


Also give them a quick visible inspection. No scoring, no pits, no scratches, no heat marks ... they can be reused

Some shade-tree mechanics don't want to use plastigauge -- in that case they measure the journals and bearings directly using micrometers then subtract the difference to get the clearance. Or if you are checking a crank that is not in the engine, you can measure it directly. Otherwise you can ignore the measurement specs and only use the clearance figures.