44. Camshaft and Bearings Cleaning and Inspection

Camshaft and Bearings Cleaning and Inspection

Special Tools

J 7872 - Magnetic Base Dial Indicator

For equivalent regional tools, refer to Special Tools (Special Tools).

1. Clean the camshaft with cleaning solvent.





Warning

Bodily injury may occur if the cleaning solvent is inhaled or exposed to the skin.

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 - indicator.

1. Mount the camshaft in V-blocks between the centers.
2. Use the J 7872 - indicator in order to measure the intermediate camshaft journal.

5. Measure the camshaft lobe lift using the J 7872 - indicator.

1. Lubricate the camshaft using GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
2. Set the camshaft on V-blocks.
3. Use the J 7872 - indicator in order to measure the lobe lift.

6. If the runout or lobe lift is not within specifications, replace the camshaft.