Jeep Grand Cherokee, Limited, Laredo Repair Manual 1993-2004

Refer to illustration 11.3

1. In order to determine the extent of cam lobe wear, the lobe lift should be checked prior to camshaft removal. Remove the valve cover (see Section 4).
2. Position the number one piston at TDC on the compression stroke (see Section 3). Remove the rocker arms (see Section 5).
3. Beginning with the number one cylinder, mount a dial-indicator on the engine and position the plunger in-line with the pushrod and resting on the end of the pushrod (see illustration).
4. Zero the dial indicator, then very slowly turn the camshaft in the normal direction of rotation until the indicator needle stops and begins to move in the opposite direction. The point at which it stops indicates maximum cam lobe lift.
5. Record this figure for future reference, then reposition the piston at TDC on the compression stroke.
6. Move the dial indicator to the next number one cylinder pushrod and repeat the check. Be sure to record the results.
7. Repeat the check for the remaining camshaft lobes. Since each piston must be at TDC on the compression stroke for this procedure, work from cylinder-to-cylinder following the firing order sequence.
8. After the check is complete, compare the results to this Chapter's Specificatioins. If camshaft lobe life is less than specified, cam lobe wear has occurred and a new camshaft should be installed.