Visual Inspection

WARNING: This page is about a different variant/trim than selected.

Perform a visual inspection of the crankshaft for damage.

Fig 1: View Of Crankshaft Position Reluctor Ring
Courtesy of GENERAL MOTORS COMPANY
The crankshaft position reluctor ring may be replaced if damaged.
Tighten the crankshaft position reluctor ring bolts to 15 N.m (11 lb ft).
CAUTION: Refer to Fastener Caution .
Inspect the crankshaft journals for wear (1). The journals should be smooth, with no signs of scoring, wear or damage.

Fig 2: Identifying Different Crankshaft Journal Wear Patterns
Courtesy of GENERAL MOTORS COMPANY
Inspect the crankshaft journals for grooves or scoring (2).
Inspect the crankshaft journals for scratches or wear (3).
Inspect the crankshaft journals for pitting or imbedded bearing material (4).

Inspect crankshaft bearings for craters or pockets. Flattened sections on the bearing halves also indicate fatigue.

Fig 1: Identifying Crankshaft Bearing Craters Or Pockets
Courtesy of GENERAL MOTORS COMPANY
Inspect the crankshaft bearings for excessive scoring or discoloration.

Fig 2: Identifying Connecting Rod Bearing Scoring Or Discoloration
Courtesy of GENERAL MOTORS COMPANY
Inspect the crankshaft bearings for dirt or debris imbedded into the bearing material.
Inspect the crankshaft bearings for improper seating indicated by bright, polished sections of the bearing.

Fig 3: View Of Crankshaft Bearing Improper Seating
Courtesy of GENERAL MOTORS COMPANY

If the lower half of the bearing is worn or damaged, both upper and lower halves should be replaced.

Generally, if the lower half is suitable for use, the upper half should also be suitable for use.