Oil Pump: Service and Repair

Oil Pump Overhaul

Oil Pump:

Removal
1. Remove the cam chain.





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





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





9. Check the housing-to-outer rotor radial clearance between the outer rotor (A) and pump housing (B). If the housing-to-outer rotor radial clearance exceeds the service limit, replace the oil pump assembly.
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), oil pump chain (B), and 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 crankshaft with the pointer (B) on the engine block.





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





18. Install the oil pump chain guide (A) and 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.