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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1216 (Vibration Symptoms Diagnosis And Correction) >> Diagnostic Information and Procedures >> Hub/Axle Flange and Wheel Stud Runout Inspection >> Tools Required

Tools Required

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

J 8001  Dial Indicator Set, or equivalent

  1. Raise and support the vehicle. Refer to LIFTING & JACKING THE VEHICLE .
  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. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION .
  4. Remove the brake rotors from the vehicle. Clean the mounting surfaces of the brake rotors and the hub/axle flanges of any loose debris, rust, and corrosion. Refer to FRONT BRAKE ROTOR and REAR BRAKE ROTOR .
    Fig 1: Measure Wheel/Hub Axle Flange Runout
    G02697028Courtesy of GENERAL MOTORS CORP.
  5. Position the J 8001  , or equivalent, on the machined surface of the wheel hub/axle flange outside of the wheelstuds.
  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.

    Specification - Guideline 

    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. Refer to the appropriate procedure:
    Fig 2: Measuring Stud Runout Using J 8001 (Dial Indicator)
    G02697029Courtesy of GENERAL MOTORS CORP.
  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.

    Specification - Guideline 

    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. Refer to the appropriate procedure:
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