Oil Pump: Testing and Inspection

NOTE: Internal components are not serviceable, if any component is not within specifications, replace pump assembly.

1. Inspect inside of pump housing and inner and outer gears for damage or excessive wear.
2. Inspect pump cover surface for excessive wear. Minor scuff marks are normal.
3. Inspect rotor for nicks, burrs or score marks. Remove minor imperfections with suitable oil stone.

Fig. 35 Oil Pump Rotor Tip Inspection:

4. Using suitable feeler gauge, inspect inner and outer rotor tip clearance.

Fig. 38 Oil pump rotor endplay inspection:

5. With rotor installed, place suitable straightedge over rotor assembly and housing, measure rotor endplay between straightedge and inner rotor and outer race, clearance should not exceed 0.005 in
6. Inspect relief valve spring for collapse or wear.
7. Inspect relief valve for free operation.