Oil Pump Cleaning and Inspection

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.

Clean the oil pump components in cleaning solvent.
Dry the components with compressed air.
Inspect the oil pump for the following conditions:
- Scoring on the top of the gears (1)
- Damaged gears (2) for the following:
  - Chipping
  - Galling
  - Wear
- Scoring, damage or casting imperfections to the body (3)
- Damaged or scored gear shaft (4)
- Damaged or scored gear shaft (5)
- Damaged bolt hole threads
- Worn oil pump driveshaft bore
- Damaged or sticking oil pump pressure relief valve (minor imperfections may be removed with a fine oil stone)
- Collapsed or broken oil pump pressure relief valve spring
If the oil pump is to be reused, install a NEW oil pump pressure relief valve spring.
During oil pump installation, install a NEW oil pump driveshaft retainer.

Fig 1: Oil Pump Inspection Areas
Courtesy of GENERAL MOTORS CORP.