Tools Required

J 7872 Magnetic Base Dial Indicator

1. Using a soft cloth and clean solvent, clean the camshaft. Do not scratch the camshaft bearing journals or lobes.

Caution: Wear safety glasses in order to avoid eye damage.

2. Using compressed air, dry the camshaft.
3. Using a soft cloth and clean solvent, clean the camshaft bearing inserts. Do not scratch the camshaft bearing inserts.
4. Inspect the camshaft for cracks using the Magnaflux Spot-check dye method or the equivalent.



5. Inspect the camshaft for the following conditions:

•	Scoring (1)

•

Nicks (1)

•	Worn camshaft lobes (2)

•	Damaged sprocket bolt threads (3)

•	Damaged sprocket pin (4)

•	Damage caused by lack of lubrication

6. Inspect the camshaft bearing inserts for the following conditions:

•

Scoring

•

Nicks

•	Damage caused by lack of lubrication




7. Inspect the camshaft retainer plate for damage.



8. Using a suitable measuring device, measure the camshaft journal diameter and taper in several places, approximately 90 degrees apart. Refer to Engine Mechanical Specifications .
9. Measure for a bent camshaft or excessive camshaft runout using J 7872 .

9.1.	Mount the camshaft in V-blocks at camshaft journals one and five.

9.2.	Using theJ 7872 Magnetic Base Dial Indicator, measure camshaft journal runout at camshaft journal three. Refer to Engine Mechanical Specifications .

10. Replace the camshaft if runout exceeds specifications.