GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 7872 Magnetic Base Dial Indicator Set


    Object Number: 193223  Size: SH
  1. Clean the camshaft in solvent.
  2. Caution: Wear safety glasses in order to avoid eye damage.

  3. Dry the camshaft with compressed air.
  4. Inspect the camshaft retainer plate for damage.

  5. Object Number: 188095  Size: SH
  6. Inspect the camshaft for the following conditions:
  7. • Camshaft bearing journals (1) that are:
       - Worn
       - Scored
       - Damaged
    • Worn camshaft lobes (2)
    • Damaged sprocket bolt threads (3)
    • Damaged sprocket pin (4)

    Object Number: 35212  Size: SH
  8. Measure the camshaft journals with a micrometer. Refer to Engine Mechanical Specifications .
  9. Measure for a bent camshaft or excessive camshaft runout using J 7872 .
  10. 6.1. Mount the camshaft in a suitable fixture.
    6.2. Use the J 7872 in order to measure for a bent camshaft. Refer to Engine Mechanical Specifications .
  11. Replace the camshaft if runout exceeds specifications.

  12. Object Number: 452376  Size: SH
  13. Inspect the camshaft bearings (1-5) for serviceability.
  14. Replace the camshaft bearings if necessary. Refer to Camshaft Bearing Removal and Camshaft Bearing Installation .