Valve Train Analysis - Engine Running, Camshaft Lobe Lift - OHC Engines

Check the lift of each camshaft lobe in consecutive order and make a note of the readings.

1. Remove the valve covers.
2. Remove the spark plugs.
3. Install the Dial Indicator with Bracketry so the rounded tip of indicator is on top of the camshaft lobe and on the same plane as the valve tappet.
4. Rotate the crankshaft using a breaker bar and socket attached to the crankshaft pulley retainer bolt. Rotate the crankshaft until the base circle of the camshaft lobe is reached.
   Fig 1: Identifying Base Circle Of Camshaft Lobe

   Courtesy of FORD MOTOR CO.
5. Zero the dial indicator. Continue to rotate the crankshaft until the (1) high-lift point of the camshaft lobe is in the fully-raised position (highest indicator reading). See Fig 1.
6. To check the accuracy of the original indicator reading, continue to rotate crankshaft until the (2) base circle is reached. The indicator reading should be zero. If zero reading is not obtained, repeat Steps 1 through 6. See Fig 1.
NOTE: If the lift on any lobe is below specified service limits, install a new camshaft, and new camshaft roller followers.
7. Remove the Dial Indicator with Bracketry.
8. Install the spark plugs.
9. Install the valve covers.