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Vibration Diagnosis and Correction: Specifications GMC Acadia I рестайлинг

Oem General Information ~1132 words

Tire and Wheel Runout Specifications

ApplicationSpecification
MetricEnglish
Tire and Wheel Assembly - Lateral and Radial
Off-Vehicle1.27 mm0.050 in
On-Vehicle1.52 mm0.060 in
Wheel, Aluminum
Lateral0.762 mm0.030 in
Radial0.762 mm0.030 in
Wheel, Steel
Lateral1.143 mm0.045 in
Radial1.015 mm0.040 in
Wheel Hub/Axle Flange - Guideline0.132 mm0.0052 in
Wheel Stud- Guideline0.25 mm0.010 in

Tire and Wheel Runout Specifications

Propeller Shaft Runout Specifications

ApplicationFront RunoutCenter RunoutRear RunoutStub Shaft Runout
MetricEnglishMetricEnglishMetricEnglishMetricEnglish
1 Piece Propeller Shaft - Guideline1.17 mm0.046 in1.27 mm0.050 in1.40 mm0.055 in
1 Piece Aluminum Graphite Propeller Shaft - Guideline1.17 mm0.046 in1.40 mm0.055 in
2 Piece System Front Propeller Shaft with Slip Yoke - Guideline0.76 mm0.030 in0.76 mm0.030 in0.71 mm0.028 in
2 Piece System Front Propeller Shaft with Stub Shaft - Guideline0.76 mm0.030 in0.76 mm0.030 in0.13 mm0.005 in
2 Piece System Rear Propeller Shaft with Slip Yoke - Guideline0.71 mm0.028 in0.76 mm0.030 in0.89 mm0.035 in
2 Piece System Rear Propeller Shaft with Stub Shaft - Guideline0.76 mm0.030 in0.89 mm0.035 in0.13 mm0.005 in
These guidelines apply only to propeller systems with 2 or 3 U-joints.

Propeller Shaft Runout Specifications

Driveline Runout Specifications

ApplicationSpecification
MetricEnglish
Differential Pinion Input Shaft or Flange Pilot0.05 mm0.002 in
Torque Tube Input Flange0.20 mm0.008 in
Transmission or Transfer Case Output Flange0.20 mm0.008 in
These guidelines apply only to propeller shaft systems with a constant velocity (CV) joint, rubber coupling or bolt-on U-joint yoke.

Driveline Runout Specifications

Driveline Torque-Load Conditions

An drive axle that has internal conditions such as excessive runout of components, misalignment of components, imbalance, etc., can produce vibration concerns which may be transmitted into the propeller shaft or shafts. This sort of a vibration occurrence can increase or decrease in severity based primarily upon torque-load, but can also be affected by cold or hot conditions.

The propeller shaft and other related components may or may not pass inspections for wear or damage, runout, alignment, etc., depending upon whether there is only one vibration source or more than one.

Vibration in Service-Stall Test (Non-Torque Sensitive)

Special Tools

  1. CH-51450-NVH Oscilloscope Diagnostic Kit (w/ NVH) or
  2. EL-38792-A Electronic Vibration Analyzer (EVA) 2

For equivalent regional tools, refer to Special Tools and Equipment .

CAUTIONDo not fill the propeller shaft with foam, oil or any other substance in order to correct a vibration. Filling the propeller shaft is only effective in reducing an unrelated condition called Torsional Rattle. Filling the propeller shaft should only be done in strict adherence to the procedure outlined in corporate bulletins that address Torsional Rattle. Failure to follow the correct procedure will induce a vibration and/or affect the structural integrity of the propeller shaft. The propeller shaft will then have to be replaced.
  1. Turn the ignition ON but do not start the engine.
  2. Place the transmission in NEUTRAL.
  3. Raise and support the vehicle. Support the drive axle or axles at curb height. Refer to «Lifting and Jacking the Vehicle»(ref-610031-S32962375812014042100000) .
  4. Remove the tire and wheel assemblies from the vehicle. Refer to «Tire and Wheel Removal and Installation»(ref-610040-S26047125632014042100000) .
  5. Remove the brake rotors or drums, if equipped, from the drive axle or axles.
  6. Inspect the propeller shaft or shafts. All propeller shafts should be free of undercoating before continuing.
  7. Have an assistant start the engine. CAUTION: Do not depress the brake pedal with the brake rotors and/or the brake drums removed or with the brake calipers repositioned away from the brake rotors or damage to the brake system may result.
  8. Place the transmission in the highest forward gear.
  9. Accelerate and decelerate the vehicle through the speed range at which the vibration was first noted during the Vibration Analysis-Road Testing procedure.
  10. Record whether the vibration was present and at what speed.
  11. If the vibration is present, determine which end of the propeller shaft is vibrating the most. Hold the accelerometer of the CH-51450-NVH Oscilloscope Diagnostic Kit (w/NVH) or the vibration sensor of the EL-38792-A Electronic Vibration Analyzer (EVA) 2, up to the pinion nose and the transmission or transfer case tail shaft housing.
  12. If the vehicle is equipped with a multiple-piece propeller shaft, hold the accelerometer of the CH-51450-NVH Oscilloscope Diagnostic Kit (w/ NVH) or the vibration sensor of the EL-38792-A EVA 2 up to the propeller shaft support bearing assembly or assemblies to inspect for vibration.
  13. If the transmission or transfer case output shaft housing is vibrating, hold the accelerometer of the CH-51450-NVH Oscilloscope Diagnostic Kit (w/ NVH) or the vibration sensor of the EL-38792-A EVA 2 up to the transmission crossmember under the transmission mount. If there is no vibration on the crossmember, then the transmission mount is working properly.
  14. Record which end of the propeller shaft is vibrating the most and how severe the vibration is. The inspection will be a reference by which to judge future progress.

Vibration in Service-Stall Test (Torque Sensitive)

Special Tools

  1. CH-51450-NVH Oscilloscope Diagnostic Kit (w/ NVH) or
  2. EL-38792-A Electronic Vibration Analyzer (EVA) 2

For equivalent regional tools, refer to Special Tools and Equipment .

CAUTIONDo not fill the propeller shaft with foam, oil or any other substance in order to correct a vibration. Filling the propeller shaft is only effective in reducing an unrelated condition called Torsional Rattle. Filling the propeller shaft should only be done in strict adherence to the procedure outlined in corporate bulletins that address Torsional Rattle. Failure to follow the correct procedure will induce a vibration and/or affect the structural integrity of the propeller shaft. The propeller shaft will then have to be replaced.
  1. Turn the ignition ON but do not start the engine.
  2. Place the transmission in NEUTRAL.
  3. Raise and support the vehicle. Support the drive axle or axles at curb height. Refer to «Lifting and Jacking the Vehicle»(ref-610031-S32962375812014042100000) .
  4. Remove the tire and wheel assemblies from the vehicle. Refer to «Tire and Wheel Removal and Installation»(ref-610040-S26047125632014042100000) .
  5. Remove the brake rotors or drums, if equipped, from the drive axle or axles.
  6. Hold the accelerometer of the CH-51450-NVH Oscilloscope Diagnostic Kit (w/ NVH) or the vibration sensor of the EL-38792-A Electronic Vibration Analyzer (EVA) 2, against the pinion nose.
  7. Have an assistant start the vehicle. CAUTION: Do not depress the brake pedal with the brake rotors and/or the brake drums removed or with the brake calipers repositioned away from the brake rotors or damage to the brake system may result.
  8. Place the transmission in the highest forward gear.
  9. Accelerate and decelerate the vehicle through the speed range at which the vibration was first noted during the Vibration Analysis - Road Testing procedure.
  10. If a vibration is present, note the CH-51450-NVH Oscilloscope Diagnostic Kit (w/ NVH) or the EL-38792-A EVA 2 reading during acceleration or deceleration.
  11. Note as to whether or not the pinion nose vibrates under load during acceleration or deceleration.
  12. If the vibration is not reproduced, reinstall the brake rotors and/or drums and the wheel/tire assemblies to put an additional load on the system. Perform steps 7 - 11 and check the components again.
  13. If the vibration is still not reproduced with rotors and/or drums reinstalled, lightly apply the brakes to further load the system while maintaining the vibration concern speed.
  14. If the pinion nose vibrates under acceleration or deceleration and other driveline components have been eliminated as a cause, the vibration may be an internal axle problem.

Torque Tube Input Flange Runout Measurement

Special Tools

GE-7872 Magnetic Base Dial Indicator Set or equivalent

Note. This measurement procedure is intended to measure torque tube runout for systems with a constant velocity (CV) joint, rubber coupling or bolt-on U-joint yoke at the torque tube.

  1. Place the transmission in NEUTRAL.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-610031-S32962375812014042100000) .
  3. If equipped with a CV joint, measure the torque tube input flange radial runout on the machined surface of the prop shaft rear CV joint housing, as close to the flange as possible: Clean the surface of the prop shaft rear CV joint housing just ahead of the torque tube input flange. Mount a dial indicator set, GE-7872 Magnetic Base Dial Indicator Set or equivalent and position the dial indicator to contact the prop shaft rear CV joint housing as close to the torque tube input flange as possible.
  4. If equipped with a rubber coupling or bolt-on U-joint yoke, measure the torque tube input flange radial runout on the machined surface of the flange pilot area: Mark the position of the prop shaft to the torque tube input flange. Separate the propshaft from the torque tube input flange. Clean the surface of the flange pilot area. Mount a dial indicator set, GE-7872 Magnetic Base Dial Indicator Set or equivalent and position the dial indicator to contact the pilot area as close to the end of the pilot as possible.
  5. Rotate the torque tube input flange by hand to locate the low spot.
  6. Set the dial indicator to zero on the low spot.
  7. Rotate the flange by hand and record the amount of radial runout.
  8. Compare the runout of the flange to the runout tolerance specifications guideline.
  9. If the torque tube input flange runout exceeds the specification, the flange requires replacement.

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