Oil Pump: Service and Repair

Engine Oil Pump Overhaul

Exploded View





Removal

1. Remove the cam chain. Cam Chain Removal

2. Remove the oil pump chain tensioner.






3. Remove the baffle plate.






4. Remove the three bolts securing the oil pump.






5. Remove the oil pump (A), the oil pump chain (B), and the crankshaft sprocket (C).






Inspection

6. Remove the bolts from the pump housing, then separate the pump housing and the pump cover.

7. Check the inner-to-outer rotor radial clearance between the inner rotor (A) and the outer rotor (B). If the inner rotor-to-outer rotor radial clearance exceeds the service limit, replace the oil pump assembly.

Inner Rotor-to-Outer Rotor Radial Clearance










8. Check the housing-to-rotor axial clearance between the rotors (A) and the pump housing (B). If the housing-to-rotor axial clearance exceeds the service limit, replace the oil pump assembly.

Housing-to-Rotor Axial Clearance










9. Check the housing-to-outer rotor radial clearance between the outer rotor (A) and the pump housing (B). If the housing-to-outer rotor radial clearance exceeds the service limit, replace the oil pump assembly.

Housing-to-Outer Rotor Radial Clearance





10. Inspect both rotors and the pump housing for scoring or other damage. Replace the oil pump assembly, if necessary.

11. Check that the oil pump turns freely.






Installation

12. Squeeze the new oil pump chain tensioner (A), then install the set clip (B) on it as shown.
NOTE: The set clip is supplied with the oil pump chain tensioner.






13. Install the crankshaft sprocket (A), the oil pump chain (B), and the oil pump (C).






14. Tighten the bolts on the oil pump.






15. Install the baffle plate.






16. Set the crankshaft sprocket so that the No. 1 piston is at top dead center (TDC). Align the key (A) on the sprocket and the crankshaft with the pointer (B) on the engine block.






17. Move the cam chain so that the colored piece (A) aligns with the punch mark (B) on the crankshaft sprocket.






18. Install the oil pump chain guide (A) and the oil pump chain tensioner (B) with the seat clip (C).






19. Remove the set clip from the oil pump chain tensioner.

20. Install the cam chain. Cam Chain Installation