45. Camshaft and Bearings Clean and Inspect

Camshaft and Bearings Cleaning and Inspection

^ Tools Required
- J 7872 Magnetic Base Dial Indicator Set

1. Clean the camshaft with cleaning solvent

Caution: Refer to Cleaning Solvent Caution in Service Precautions.





2. Inspect the camshaft for the following conditions:
^ Scored camshaft bearing journals (1)
^ Damaged camshaft lobes (2)
^ Damaged camshaft sprocket locator pins (3)
^ Damaged threads (4)
^ Damage to the camshaft reluctor tooth (5)





3. Measure the camshaft journals using a micrometer. If the camshaft journals are not within specifications, replace the camshaft.





4. Measure the camshaft runout using the J 7872.
4.1. Mount the camshaft in V-blocks between the centers.
4.2. Use the J 7872 in order to measure the intermediate camshaft journal.
5. Measure the camshaft lobe lift using the J 7872.
5.1. Lubricate the camshaft using GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
5.2. Set the camshaft on V-blocks.
5.3. Use the J 7872 in order to measure the lobe lift.
6. If the runout or lobe lift is not within specifications, replace the camshaft.