Camshaft: Testing and Inspection

Camshaft Inspection

1. Remove the camshaft sprocket Camshaft Sprocket Removal.

2. Remove the rocker arm assembly Rocker Arm Assembly Removal, then disassemble the rocker arm Rocker Arm And Shaft Disassembly/Reassembly.

3. Put the rocker shaft holder bridge on the cylinder head, then tighten the bolts to the specified torque.









4. Seat the camshaft by pushing it toward the rear of the cylinder head.

5. Zero the dial indicator against the end of the camshaft. Push the camshaft back and forth, and read the end play. If the end play is beyond the service limit, replace the thrust cover and recheck. If it is still beyond the service limit, replace the cylinder head. If it is still beyond the service limit, replace the camshaft.

Camshaft End Play









6. Remove the camshaft Camshaft Removal.

7. Wipe the camshaft clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, scored, or excessively worn.

8. Measure the diameter of each camshaft journal.






9. Zero the gauge (A) to the journal diameter.






10. Clean the camshaft bearing surfaces in the cylinder head. Measure the inside diameter of each camshaft bearing surface, and check for an out-of-round condition:

- If the camshaft-to-holder clearance is within limits, go to step 12.
- If the camshaft-to-holder clearance is beyond the service limit, and the camshaft has been replaced, replace the cylinder head.
- If the camshaft-to-holder clearance is beyond the service limit, and the camshaft has not been replaced, go to step 11.

Camshaft-to-Holder Oil Clearance










11. Check the total runout with the camshaft supported on V-blocks:

- If the total runout is within the standard, replace the cylinder head.
- If the total runout is not within the standard, replace the camshaft, and recheck the oil clearance. If the oil clearance is still out of tolerance, replace the cylinder head.

Camshaft Total Runout










12. Measure the cam lobe height.

Cam Lobe Height Standard (New)