Valve Train Analysis - Engine Running, Camshaft Lobe Lift - OHC Engines
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Check the lift of each camshaft lobe in consecutive order and make a note of the readings.
- Remove the valve covers.
- Remove the spark plugs.
- Install the Dial Indicator Gauge with Holding Fixture so the rounded tip of indicator is on top of the camshaft lobe and on the same plane as the valve tappet.
- 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.
- 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).
- 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.
- Remove the Dial Indicator Gauge with Holding Fixture.
- Install the spark plugs.
- Install the valve covers.
NOTE:
If the lift on any lobe is below specified service limits, install a new camshaft, and new camshaft roller followers.