Engine Oil Pump - Inspection

INSPECTION

1. Disassemble oil pump. Engine Oil Pump - Disassembly
2. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. Replace pump cover if scratched or grooved.









3. Lay a straightedge (1) across the pump cover surface. If a 0.025 mm (0.001 in.) feeler gauge blade (2) can be inserted between cover and straight edge, cover should be replaced.





4. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 14.299 mm (0.563 in.) or less, or if the diameter is 79.78 mm (3.141 inches.) or less, replace outer rotor.





5. If inner rotor measures 14.299 mm (0.563 in.) or less replace inner rotor.










6. Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body. If measurement is 0.39 mm (0.015 inch.) or more, replace body only if outer rotor is in specifications.










7. Install inner rotor into body. If clearance between inner (3) and outer (2) rotors is 0.20 mm (0.008 inch.) or more, replace both rotors.










8. Place a straightedge across the face of the body, between bolt holes. If a feeler gauge of 0.077 mm (0.003 in.) or more can be inserted between rotors and the straightedge, replace pump assembly ONLY if rotors are in specs.

9. Inspect oil pressure relief valve plunger for scoring and free operation in its bore. Small marks may be removed with 400-grit wet or dry sandpaper.









10. The relief valve spring (2) has a free length of approximately 49.5 mm (1.95 in.) it should test between 101-110 N (23-25 lbs.) when compressed to 34 mm (1-11/32 in.). Replace spring that fails to meet specifications.

11. Assemble oil pump. Engine Oil Pump - Assembly