## 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.