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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Flex Plate/Torque Converter Vibration Test >> Isolating Vibration

Isolating Vibration

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CAUTION:

Some engine/transaxle combinations cannot be balanced in this manner due to restricted access or limited clearances between the torque converter bolts and the engine. Ensure that the bolts do not bottom out in the lug nuts or the torque converter cover which could dent and cause internal damage.

To isolate and correct a flywheel or torque converter vibration, separate the torque converter from the flywheel to determine if vibration is in the engine or transmission.

  1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.
  2. Turn the engine OFF.
  3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  4. Remove the transmission converter cover bolts and the cover.
  5. Mark the relationship of the converter to the flywheel.
  6. Remove the bolts attaching the converter to the flywheel.
  7. Slide the torque converter away from the flywheel.
  8. Rotate the flywheel and torque converter to inspect for defects or missing balance weights.
  9. Lower the vehicle.
  10. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to Diagnostic System Check - Vehicle (with HP2) , Diagnostic System Check - Vehicle (without HP2) .
  11. Turn the engine OFF.
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