Oil Pump: Service and Repair

Removal
1. Remove the cam chain.





2. Remove the oil screen (A), then remove the oil pump (B).

Inspection
1. Remove the pump cover.





2. 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.





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





4. 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.
Housing-to-Outer Rotor Radial Clearance
Standard (New): 0.10 - 0.18 mm (0.004 - 0.007 inch)
Service Limit: 0.20 mm (0.008 inch)
5. Inspect both rotors and the pump housing for scoring or other damage. Replace parts if necessary.
6. Install the oil pump cover.

Installation





1. Install the dowel pins (A) and new O-ring (B) on the oil pump (C), then align the inner rotor with the crankshaft, and install the oil pump.
2. Install the oil screen (D) with new gasket (E).
3. Install the cam chain.