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Home >> Pontiac >> 2002 >> Grand AM L4-2.2L VIN F >> Repair and Diagnosis >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Vibration Diagnosis and Correction >> Diagnostic Information and Procedures >> Hub/Axle Flange and Wheel Stud Runout Inspection

Hub/Axle Flange and Wheel Stud Runout Inspection



Hub/Axle Flange and Wheel Stud Runout Inspection

Tools Required

J 8001 Dial Indicator Set, or equivalent

1. Raise and support the vehicle. Refer to vehicle Lifting.
2. Mark the location of the wheels to the wheel studs and mark the specific vehicle position on each tire and wheel - LF, LR, RF, RR.
3. Remove the tire and wheel assemblies from the vehicle.
4. Remove the brake rotors and/or brake drums from the vehicle. Clean the mounting surfaces of the brake rotors, the brake drums, if equipped, and the hub/axle flanges of any loose debris, rust, and corrosion. Refer to the following procedures:

* Brake Rotor Replacement - Front in Disc Brakes
* Brake Rotor Replacement - Rear, if equipped, in Disc Brakes
* Brake Drum Replacement, if equipped, in Drum Brakes




5. Position the J 8001, or equivalent, on the machined surface of the wheel hub/axle flange outside of the wheel studs.
6. Rotate the hub one complete revolution in order to find the low spot.
7. Set the J 8001, or equivalent, to zero at the low spot.
8. Rotate the hub one more complete revolution and measure the total amount of wheel hub/axle flange runout.

Wheel hub/axle flange runout tolerance guideline: 0.132 mm (0.005 in)

9. If the runout of the wheel hub/axle flange IS within specification, proceed to step 12.
10. If the runout of the wheel hub/axle flange is marginal, the wheel hub may or may not be the source of the disturbance.
11. If the runout of the wheel hub/axle flange is excessive, replace the wheel hub/axle flange. Measure the runout of the new wheel hub/axle flange.




12. Position the J 8001, or equivalent, in order to contact the wheel mounting studs.
Measure the stud runout as close to the flange as possible.
13. Turn the hub one complete revolution to register on each of the wheel studs.
14. Zero the J 8001, or equivalent, on the lowest stud.
15. Rotate the hub one more complete revolution and measure the total amount of wheel stud - stud circle - runout.

Wheel stud runout tolerance guideline: 0.254 mm (0.010 in)

16. If the runout of the wheel studs - stud circle - is marginal, the wheel studs may or may not be contributing to the disturbance.
17. If the runout of the wheel studs - stud circle - is excessive, replace the wheel studs as necessary. Measure the runout of the new wheel studs.
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