Oil Pump Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.

Fig 1: View Of Oil Pump Gears & Housing

Courtesy of GENERAL MOTORS CORP.

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 gears (427, 428) for the following:
- Scoring
- Chipping
- Galling
- Excessive wear
Inspect the oil pump housing (422) for the following:
- Damaged bolt hole threads
- Worn oil pump driveshaft bore
- Scoring or excessive wear within the housing
- Worn driven gear shaft

Fig 2: View Of Pressure Relief Valve, Spring & Retaining Pin

Courtesy of GENERAL MOTORS CORP.

Inspect for a collapsed pressure relief valve spring.
Inspect the pressure relief valve for scoring or wear. The valve should move freely within the bore of the housing.