Component Tests and General Diagnostics

1. Clean crankshaft journals. Inspect journals and thrust faces for nicks, burrs or roughness that would cause premature bearing wear.
2. If crankshaft main journals are not damaged or worn excessively, use select-fit codes on cylinder block and crankshaft with the select-fit grade chart to determine appropriate replacement grade for the crankshaft main bearings.

CAUTION: To maintain proper main bearing bore alignment, the lower cylinder block must be loosened and tightened as a unit.

3. If crankshaft journals are worn or damaged, replace crankshaft and use select-fit grade chart to determine appropriate replacement grade for the crankshaft main bearings.