Vibration Analysis - Engine Balance
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2. If sufficient clearance exists to separate the transmission torque converter from the engine flywheel/flexplate, then further tests can be used to isolate the transmission from the engine.
- 3. An engine flywheel/flexplate that has excessive lateral runout, when combined with the mass of the transmission torque converter, can produce a disturbance.
- 4. An engine flywheel/flexplate that is loose at the engine crankshaft or that is cracked or damaged, when combined with the mass of the transmission torque converter, can produce a disturbance.
- 5. This step is designed to isolate the transmission from the engine to determine if the disturbance is related to the engine ONLY.
- 7. Re-indexing the transmission torque converter to the engine flywheel/flexplate alters the balance relationship between the torque converter and the rear of the engine.
- 9. Placing the J 38792-A sensor onto the underside of the engine oil pan along the FRONT and the REAR edge allows for a determination to be made, which will help to narrow down the cause of the disturbance.
- 10. An engine flywheel/flexplate that is damaged, misaligned, and/or imbalanced, can produce a disturbance.
- 11. An engine crankshaft (harmonic) balancer that is damaged, misaligned and/or imbalanced, can produce a disturbance.