Camshaft Inspection

Camshaft Inspection

NOTE:
^ Do not rotate the camshaft during inspection.
^ Remove the rocker arms and rocker shafts.





1. Put the camshaft and the camshaft holders on the cylinder head, then tighten the bolts to the specified torque.

NOTE: Apply new engine oil to the bolt threads.

2. Seat the camshaft by pushing it away from the camshaft pulley end of the cylinder head.





3. Zero the dial indicator against the end of the camshaft, then push the camshaft back and forth and read the end play.
4. Unscrew the camshaft holder bolts 2 turns at a time, in a crisscross pattern. Then remove the camshaft holders from the cylinder head.
5. Lift the camshaft out of the cylinder head, wipe it clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, scored, or excessively worn.
6. Clean the camshaft journal surfaces in the cylinder head, then set the camshaft back in place. Place a plastigage strip across each journal.
7. Install the camshaft holders, then tighten the bolts to the specified torque as shown in step 1.





8. Remove the camshaft holders. Measure the widest portion of plastigage on each journal.
^ If the camshaft-to-holder clearance is within limits, go to step 10.
^ 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 9.





9. Check the total runout with the camshaft supported on V-blocks.
^ If the total runout of the camshaft is within the service limit, replace the cylinder head.
^ If the total runout is beyond the service limit, replace the camshaft and recheck the camshaft-to-holder oil clearance. If the oil clearance is still out of tolerance, replace the cylinder head.





10. Measure cam lobe height.