Valve Train Analysis-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 

   Fig 1: Measuring Camshaft Lobe Lift - Push Rod Engine

   Courtesy of FORD MOTOR CO.
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).
NOTE: If lift on any lobe is below specified service limits, install a new camshaft, and new valve tappets.
7. Remove the Dial Indicator with Bracketry, adapter, and auxiliary starter switch.
8. Install rocker arm seats, rocker arms and rocker arm seat bolts.
9. Install valve covers.
10. Install spark plugs.