Inspection

INSPECTION

NOTE: DO NOT remove oil pressure relief valve. If the oil pressure relief valve is suspect, replace the oil pump assembly.




1. Disassemble the oil pump.
2. Clean all oil pump components.
3. Inspect mating surface of the oil pump housing and cover. Replace oil pump if deeply scratched or grooved (minor surface scratches and polishing is normal).
4. Lay a straightedge (1) across the pump cover (3) surface. If a 0.025 mm (0.001 in.) feeler gauge (2) can be inserted between cover and straight edge, cover should be replaced.




5. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.954 mm (0.392 in.) or less , or if the diameter is 89.174 mm (3.5108 in.) or less, replace outer rotor.




6. Measure the inner rotor, if inner rotor measures 9.954 mm (0.392 in.) or less replace inner rotor.




7. Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body (2). If measurement is 0.39 mm (0.015 in.) or more, replace body only if outer rotor is in specifications.




8. Install inner rotor (3) into body. If clearance between inner rotor (3) and outer rotor (1) is 0.20 mm (0.008 in.) or more, replace both rotors.




9. Place a straightedge (1) across the face of the body, between bolt holes. If a feeler gauge (2) 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 specification.
10. Assemble oil pump.