Bearing Noises & Program Reporting Form Information

WHEEL BEARING NOISE

^ Drive the vehicle at low speed on a smooth road.
^ Turn the vehicle to develop left and right motions, traffic permitting.
^ Noise should change due to cornering loads.
^ Jack up the wheels to verify roughness at the wheels.

DIFFERENTIAL BEARING NOISE

^ Drive the vehicle at low speed on a smooth road.
^ Constant low pitch bearing noise may be heard.
^ Noise should not change in reversing turns.
^ The noise pattern should vary with the wheel speed.

PINION BEARING NOISE

^ Rough running or a whine noise should increase with wheel speed.
^ Noise pitch should be higher than differential noise.
^ Perform the test on a smooth road to minimize tire noises.
^ Perform the test at various speeds in drive, float and coast.
^ Rear pinion bearing noise may be louder on acceleration.
^ Front pinion bearing noise may be louder on deceleration.
^ Gear noise tend to peak in a narrow speed range.



1988 PONTIAC 6000 STE
ALL-WHEEL-DRIVE REAR DIFFERENTIAL EXCHANGE PROGRAM REPORTING FORM