Bearing Replacement

NOTE: Engine bearings are precision insert bearings, which are available for service use in standard and 0.001 in undersize.

CAUTION: Do not scrape, shim, or file bearing inserts. If the bearing surface of the insert is touched with bare fingers, the skin oil and acids will etch the bearing surface.





1. Inspect the bearing surfaces for the following conditions:
^ Wear
^ Gouges
^ Embedded foreign material. If foreign material is present, determine the nature and the source of the foreign material. Inspect the oil pan sludge and residue.
^ Uneven side-to-side wear, resulting from a bent crankshaft or tapered bearing journals.
2. Inspect the outer surfaces for the following conditions:
^ Spot wear, resulting from insert movement or high spots in the surrounding material
^ Discoloration, resulting from overheating
^ Flattened tangs and wear grooves, resulting from looseness or rotation

NOTE: Carefully inspect bearing failure, other than normal wear. Inspect the crankshaft or the connecting rod and the bearing bores. Use the following procedure, in order to inspect the connecting rods or main bearing bores:
^ Torque the bearing cap to specifications.
^ Measure the bore for taper and out of round.
^ Ensure that taper or out of round does not exist.

3. Inspect the thrust surfaces of the main thrust bearing for the following conditions:
^ Wear
^ Grooving, as a result of irregularities in the crankshaft thrust surface
4. Inspect the bearing cap bolts.
^ In order to determine if a bolt is stretched, compare it to a new bolt.
^ Replace the bearing cap bolts, as necessary.