Crankshaft Main Bearings

Note that main bearing caps are marked for cylinder identification. Arrow on cap points toward front of engine.
When removing rear main bearing cap, note installed position of cap side seals with relation to seal holes. Also, note position of thrust washers.
Check clearances 1 at a time. With all bearing caps tightened (except one being checked), check clearances using Plastigage method.
Using a micrometer, check crankshaft journals for taper. Taper must not exceed 0.002" (0.05 mm).
To check crankshaft for straightness, place "V" blocks under crankshaft journals at both ends. Position dial indicator point on center journal.
Slowly turn crankshaft at least 1 full revolution, while recording crankshaft runout. Maximum runout is 0.0012" (0.030 mm).
When installing thrust washers, be sure oil-grooved sides face thrust sides of crankshaft.
Install side seals between cylinder block and rear main bearing cap as follows: On RWD models, install seals with hole facing sideways. On FWD models, install seals with hole facing front or rear of engine.