Propeller Shaft Diagnosis (Runout Measurement)
^ Tools Required- J 8001 Dial Indicator Set
IMPORTANT: The driveline components on this vehicle have been factory balanced. System balancing provides a smoother running driveline operation.
Be sure to observe and accurately reference mark the positions of all of the driveline components relative to the propeller shaft and to the rear axle before disassembly.
The following components must be reference marked before disassembly:
^ The propeller shaft
^ The rear axle
^ The drive pinion gear yoke
Be sure to reassemble all of the components in the exact relationship to each other that existed before disassembly.
Be sure to follow the following specifications during reassembly in order to maintain the factory balance of the components:
^ The published specifications
^ The torque values
^ Any measurements made prior to disassembly
IMPORTANT: A bent propeller shaft may cause noise or vibrations at high speeds.
Rough handling or a collision may cause damage to the propeller shaft.
Inspect for propeller shaft straightness
1. Place the transmission range selector lever in the NEUTRAL position.
2. Raise the vehicle on a twin point hoist. Suitably support the vehicle.
Ensure that the following conditions are met:
^ The vehicle is supported on the rear axle housing
^ The rear wheels can rotate freely
3. Use one of the following arrangements in order to prepare the J 8001 for use:
^ Mount the J 8001
Ensure that the moveable support is high enough in order to permit contact of the indicator button with the propeller shaft.
^ Mount the J 8001 onto a magnetic base.
Attach the base to a smooth place on the underbody of the vehicle.
4. For a one-piece propeller shaft, take the readings at the following points:
^ The center runout measurement point (1)
^ The rear runout measurement point (2)
^ The front runout measurement point (4)
5. For a two-piece propeller shaft, take the readings at the following points:
^ The center runout measurement point (1)
^ The rear runout measurement point (2)
^ The front runout measurement point (3)
6. Turn a rear wheel in order to rotate the propeller shaft.
Inspect for runout.
7. If the runout exceeds 1.40 mm (0.055 inch), complete the following steps:
7.1. Disconnect the propeller shaft at the differential drive pinion gear yoke.
7.2. Rotate the propeller shaft 180 degrees.
7.3. Reinstall the propeller shaft.
8. Inspect for runout.
If the runout still exceeds 1.40 mm (0.055 inch), measure the differential drive pinion gear yoke runout.
9. If the runout still exceeds 1.40 mm (0.055 inch), inspect for vibrations or noise.
If necessary, replace the propeller shaft.
10. Lower the vehicle.