Valve Train Components Clean and Inspect

^ Tools Required
- J 8520 Camshaft Lobe Lift Indicator, Or Equivalent





^ Inspect the following areas
- Inspect the valve rocker arms and ball at the mating surfaces. These surfaces should be smooth and free of scoring or other damage.
- Inspect the valve rocker arm valve pushrod sockets and valve stem mating surfaces. These surfaces should be smooth with no scoring or exceptional wear.





- Inspect the valve pushrods for scored ends or bends.
- The camshaft and crankshaft sprockets for wear
- One edge of worn teeth or that are no longer concentric
- The valley between worn teeth
- The key and crankshaft keyway for wear
- The crankshaft timing chain for binding





- Measure the camshaft lobe lift.
1. Position the camshaft lobe lift indicator with the ball socket adapter on the valve pushrod. Be sure that the valve pushrod is in the valve lifter socket.
2. Slowly rotate the crankshaft until the valve lifter roller is on the heel of the cam lobe. The valve pushrod will be in its lowest position.
3. Set the camshaft lobe lift indicator on zero.
4. Slowly rotate the crankshaft until the valve pushrod is raised fully.
5. Compare the total lift shown on the camshaft lobe lift indicator with the specifications.
6. Remove the camshaft lobe lift indicator.