Oil Pump: Inspection
- Clean all parts in solvent and dry thoroughly with compressed air. Be sure that all dirt or metal particles are removed from pressure relief valve chamber.
- Check inside of pump housing, outer race and rotor for excessive wear or damage. Check mating surface of pump cover for wear. If pump cover mating surface is excessively worn, scored or grooved, replace pump assembly.
- Measure rotor tip clearance. See Fig 1 . If rotor tip clearance exceeds specification, pump assembly must be replaced.
- With rotor assembly installed in pump housing, place a straight edge across pump housing. Using a feeler gauge, measure clearance between straight edge and both inner and outer rotors.
- Maximum rotor end play should not exceed .005" (.13 mm). If clearance limit is exceeded, pump must be replaced.
- Check oil pump driveshaft to housing clearance by measuring outside diameter of shaft and inside diameter of housing bearing. Clearance should be .0015-.0030" (.038-.076 mm). If not, replace pump assembly.
- Check pressure relief valve to bore clearance. Check tension of pressure relief valve spring. Spring tension should be 15.2-17.2 lbs. (6.9-7.8 kg) when spring is extended to 1.2" (30.4 mm). If spring tension is not correct, replace pump assembly.