Crankshaft And Bearings (Unit Repair) Removal: Removal

1. Remove crankshaft from block.
2. Remove crankshaft rear oil seal.
   Fig 1: Remove Crankshaft From Block And Crankshaft Rear Oil Seal

   Courtesy of GENERAL MOTORS CORP.
3. Remove bearing inserts from block.
   Fig 2: Removing Bearing Inserts From Block

   Courtesy of GENERAL MOTORS CORP.
4. Clean oil, sludge, and carbon.
5. Inspect oil passages for obstructions.
6. Inspect all threads.
7. Inspect bearing journals and thrust surfaces for the following conditions:
   • Cracks
   • Chips
   • Gouges
   • Roughness
   • Grooves
   • Overheating (discoloration)
8. Inspect the corresponding bearing inserts for imbedded foreign material. If foreign material exists find the cause and repair it.

   IMPORTANT:  Replace the crankshaft if cracks, severe gouges or burned spots are found. Slight roughness may be removed with a fine polishing cloth soaked in clean engine oil. Burrs may be removed with a fine oil stone.

9. Measure crankshaft journals. Use a micrometer or dial indicator to measure the taper and runout. Note the result for the later selection of bearing inserts. If journal is worn beyond the limits, the crankshaft must be machined for undersize bearings.

Note the location of the main bearing high spots. If journal is worn beyond the limits the crankshaft must be machined for undersize bearings.

Fig 3: Inspecting The Corresponding Bearing Inserts

Courtesy of GENERAL MOTORS CORP.