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> Main bearing clearances?
stugray
post Jul 28 2012, 08:56 PM
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I am getting ready to put my short block together and I have what appears to be a fairly new crank.
Main bearing journals: 2.361.
The bearings appear to be new unused STD-STD.

When I put on the main bearing that goes directly beneath the cam gear dry and wiggle it I get ~4 thousandths "wiggle" when measured with a dial indicator stuck to the flywheel.

Does that sound correct?
Would that be considered two thousandths bearing clearance (2 on each side = 4)?

Stu
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ldsgeek
post Jul 29 2012, 07:07 PM
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The only way to check the clearance on those bearings is before they are assembled on the crank, and you need either an inside mic or snap gauges. When the case halves are torqued they compress the bearing shell slightly, meaning the clearance you are seeing is not what it will be when assembled. At this point you can either say "close enough for gov't work" and assemble it or disassemble the crank to check it properly. It all depends on how confident you feel.
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