45. Camshaft and Bearings Cleaning and Inspection

Camshaft and Bearings Cleaning and Inspection

Tools Required

J 7872 Magnetic Base Dial Indicator

1. Remove and discard the camshaft position actuator filter (1).
2. Clean the camshaft with cleaning solvent.




Caution: Refer to Cleaning Solvent Caution .

3. Inspect the camshaft for the following conditions:

* Scored camshaft bearing journals (5)
* Damaged camshaft lobes (4)
* Damaged camshaft position sensor reluctor area (3)
* Damaged threads (2)




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




5. Measure the camshaft runout using the J 7872 .

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

6. Measure the camshaft lobe lift using the J 7872 .

1. Lubricate the camshaft using GM P/N 12345501 (Canadian P/N 992704) or the equivalent.
2. Set the camshaft on V-blocks.
3. Use the J 7872 in order to measure the lobe lift.

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





Important: Always install a NEW camshaft position actuator filter anytime the camshaft position actuator is removed or installed.

8. Install a NEW camshaft position actuator filter (1).