Wheel Bearings Diagnosis (Tapered): Galling

Fig 1: Identifying Galling

Courtesy of GENERAL MOTORS CORP.

The metal smears on the roller ends are due to overheating, lubricant failure, or lubricant overload.

1. Check the seals.
2. Check for proper lubrication.
3. Clean all of the parts and the housings.
4. Replace the bearing. Refer to WHEEL HUB, BEARING, AND SEAL REPLACEMENT in Front Suspension.