Lobe Lift Test

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

PROCEDURE
1. Remove valve covers (6582).
2. Remove spark plugs.
3. Install Dial Indicator with Bracketry TOOL-4201-C or equivalent so that the rounded tip of the indicator is on top of camshaft lobe and on the same plane as hydraulic lash adjuster (HLA).

NOTE: Crank engine with ignition switch in OFF position.

4. Rotate the crankshaft (6303) using a breaker bar and socket attached to the crankshaft pulley retainer bolt. Rotate the crankshaft until base circle of camshaft lobe is reached
5. Zero the dial indicator.
6. Continue to rotate crankshaft slowly until camshaft lobe is in fully-raised position (highest indicator reading). Record reading.
7. To check accuracy of original indicator reading, continue to rotate crankshaft until indicator reads zero. If zero reading is not obtained, repeat Steps 3 through 7.

NOTE: If lift on any lobe is below specified service limits, the roller follower operating on that camshaft (6250) must be replaced.

8. Compare total lift recorded with specifications.
9. Repeat procedure for each lobe.
10. Remove dial indicator, adapter and auxiliary starter switch.
11. Install valve covers.
12. Install spark plugs.