Engine Oil Pump Overhaul

Exploded View

 

Oil Pump Removal


1.Remove the cam chain.

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

 

Oil Pump 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.

Inner Rotor-to-Outer Rotor Radial Clearance
Standard (New): 0.02-0.14 mm
(0.001-0.006 in.)
 
Service Limit: 0.20 mm (0.08 in.) 

 

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.

Housing-to-Rotor Axial Clearance
Standard (New): 0.02-0.07 mm
(0.001-0.003 in.)
 
Service Limit: 0.15 mm (0.006 in.) 

 

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 in.)
 
Service Limit: 0.20 mm (0.008 in.) 

 

5.Inspect both rotors and the pump housing for scoring or other damage. Replace parts if necessary.

6.Install the oil pump cover.

Oil Pump Installation


1.Install the dowel pins (A) and new O-ring (B) on the oil pump (C), then align the inner rotor with crankshaft, and install the oil pump.

 

2.Install the oil screen (D) with new gasket (E).

3.Install the cam chain.