Overhaul

Oil Pump: Disassembly and Assembly

Disassembly

1) Remove oil pump cover.
2) Remove inner rotor and outer rotor from oil pump body.
3) Remove the regulator valve plug, regulator valve spring and regulator valve.

Inspection after Disassembly

Clearance of Oil Pump Parts

- Measure radial clearance using a suitable tool.

[1][2]Engine Lubrication

- Measure side clearance using suitable tools.

[1][2]Engine Lubrication

- Calculate the clearance between inner rotor and oil pump body as follows.

1) Measure the inner diameter of oil pump body to brazed portion (position 5) using suitable tool.
2) Measure the outer diameter of protruded portion of inner rotor (position 6) using suitable tool.
3) Calculate the clearance using the following formula.
- (Clearance) = (Inner diameter of oil pump body) - (Outer diameter of inner rotor)
[1][2]Engine Lubrication

Regulator Valve Clearance

Check regulator valve to oil pump cover clearance using the following formula.

- (Clearance) = D1 (Valve hole diameter) - D2 (Outer Diameter of valve)

[1][2]Engine Lubrication

CAUTION:

- Coat regulator valve with engine oil.

- Check that it falls smoothly into the regulator valve hole by its own weight.

Assembly

Installation is in the reverse order of removal.

NOTE:

- Install oil pump inner rotor with the groove facing the oil pump cover side.
- Install the oil pump outer rotor with the punch mark facing the oil pump cover side.