Cherokee 4WD L6-4.0L VIN S (1998)
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10. Start the engine and re-check for vibration. If there is little or no change in vibration, move the clamp to one of the other three positions. Repeat
the vibration test.
11. If there is no difference in vibration at the other positions, the source of the vibration may not be propeller shaft.
Two Clamp Screws At The Same Position
12. If the vibration decreased, install a second clamp and repeat the test.
Clamp Screws Separated
13. If the additional clamp causes an additional vibration, separate the clamps (1/4 inch above and below the mark). Repeat the vibration test.
14. Increase distance between the clamp screws and repeat the test until the amount of vibration is at the lowest level. Bend the slack end of the clamps
so the screws will not loosen.
15. If the vibration remains unacceptable, apply the same steps to the front end of the propeller shaft.
16. Install the wheel and tires. Lower the vehicle.
RUNOUT
1. Remove dirt, rust, paint, and undercoating from the propeller shaft surface where the dial indicator will contact the shaft.
2. The dial indicator must be installed perpendicular to the shaft surface.
3. Measure runout at the center and ends of the shaft sufficiently far away from weld areas to ensure that the effects of the weld process will not enter
into the measurements.