Crankshaft Clean and Inspect

1. Clean the crankshaft of the following elements:
^ Oil
^ Sludge
^ Carbon
2. Probe the oil passages for obstructions.
3. Inspect the keyway for nicks or wear.
4. Inspect the threads.

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

5. Inspect the bearing journals and thrust surfaces for the following conditions:
^ Cracks
^ Chips
^ Gouges
^ Roughness
^ Grooves
^ Overheating (discoloration)
6. Inspect the corresponding bearing inserts for embedded foreign material and determine its source.

CAUTION: Note the location of main bearing high spots. If they are not in line, the crankshaft is bent and must be replaced.

7. Measure the crankshaft journals. Use a micrometer in order to measure taper and out-of-round. If the readings are within specifications, note the results for later selection of bearing inserts. If the crankshaft journal are not within limits, replace the crankshaft.