Engine Running, Camshaft Lobe Lift-Push Rod Engine

Check the lift of each lobe in consecutive order and make a note of the readings.
1. Remove the valve covers.
2. Remove the rocker arm seat bolts, rocker arm seat and rocker arms.





Typical Engine With Push Rods

3. Make sure the valve tappet is seated against camshaft. Install (1) Dial Indicator with Bracketry so the ball socket adapter of the indicator is on top of the valve tappet or (2) Cup Shaped Adapter is on top of push rod and in same plane as valve tappet push rod movement.
4. Remove the spark plugs.
5. Connect an auxiliary starter switch in the starting circuit. Crank the engine with ignition switch in OFF position. Bump crankshaft over until valve tappet is on base circle of camshaft lobe. At this point, valve tappet will be in its lowest position. If checking during engine assembly, turn crankshaft using a socket or ratchet.
6. Zero the dial indicator. Continue to rotate crankshaft slowly until valve tappet is in fully-raised position (highest indicator reading).

7. Note: If lift on any lobe is below specified service limits, a new camshaft and valve tappet must be installed.

Compare total lift recorded on dial indicator with specifications.
8. To check the accuracy of the original dial indicator reading, continue to rotate the crankshaft until indicator reads zero.
9. Remove the dial indicator, adapter and auxiliary starter switch.

10. Caution: After installing rocker arms, do not rotate crankshaft until valve tappets have had sufficient time to bleed down. To do otherwise may cause serious valve damage. Manually bleeding-down valve tappets will reduce waiting time.

Install rocker arm seats, rocker arms and rocker arm seat bolts.
11. Install valve covers.
12. Install spark plugs.