Inspection

DISASSEMBLE
1. Remove relief valve plug and gasket, then the spring and relief valve.
2. Remove oil pump attaching bolts and cover.
3. Remove pump rotors.

INSPECTION
1. Clean all parts thoroughly in a suitable solvent. Mating surface of oil pump should be smooth. Replace pump cover if scratched or grooved.
2. Lay a straightedge across pump cover surface. If 0.003 inch feeler gauge can be inserted between cover and straightedge, replace cover.
3. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 0.301 inch or less, or if diameter is 3.148 inches or less, replace outer rotor.
4. If inner rotor measures 0.301 inch or less, replace inner rotor.
5. Place outer rotor into pump housing and press to one side. Measure clearance between rotor and housing. If measurement is 0.015 inch or more, replace housing.
6. Install inner rotor into pump housing. If clearance between inner and outer rotors is 0.008 or more, replace rotors.
7. Place a straightedge across face of pump housing, between bolt holes. If a feeler gauge of 0.004 inch or more can be inserted between rotors and straightedge, replace pump assembly, only if rotors are in specification.
8. Inspect oil pressure relief valve plunger for scoring and free operation in its bore. Small marks may be removed with 400 grit wet/dry sandpaper.
9. Oil pump relief valve spring is approximately 2.39 inches in length and should indicate 18-19 lbs. resistance when compressed to 1.6 inches. Replace spring if it fails to meet specification.