Main Bearings

Measure crankshaft runout at center bearing journal. If runout exceeds .004" (.10 mm), replace crankshaft.
Inspect all journals for wear or scoring. Out-of-round or taper limit is .0004" (.010 mm). If crankshaft is worn excessively, grind journals for undersize bearings.
Measure bearing clearances using Plastigage method. Observe correct tightening sequence. See Fig 1. If clearance exceeds specification, grind journals for undersize bearings.
Maximum bearing clearance is .0031" (.078 mm). Main bearings are available in .25 mm undersize. Main journal finish diameter for undersize bearings is 2.3504-2.3508" (59.700-59.710 mm).

Fig 1: Main Bearing Tightening Sequence