Disassembly and Assembly

OIL PUMP

Disassembly and Assembly












CAUTION:
Before assembly apply new engine oil to the parts as shown above.

DISASSEMBLY

1.Remove the oil pump cover.
2.Remove inner rotor and outer rotor from oil pump housing.

CAUTION:
The outer rotor has directional vanes in relation to the rotation of the oil pump shaft. Note the outer rotor vane direction for assembly.
3.Remove oil strainer from oil pump housing.
4.After removing regulator plug, remove spring and regulator valve.

INSPECTION AFTER DISASSEMBLY

Clearance of Oil Pump Parts





- Measure clearance with feeler gauge.
- Clearance between outer rotor and oil pump body (position 1).
Standard Oil Pump
- Tip clearance between inner rotor and outer rotor (position 2).
Standard Oil Pump





- Measure clearance with feeler gauge and straightedge.
- Side clearance between inner rotor and oil pump body (position 3).
Standard Oil Pump
- Side clearance between outer rotor and oil pump body (position 4).
Standard Oil Pump
- Calculate the clearance between inner rotor and oil pump body as follows.





1.Measure the outer diameter of protruded portion of inner rotor (position A).
2.Measure the inner diameter of oil pump body with inside micrometer (position B).
(Inner rotor to brazed portion of housing clearance) = (inner diameter of oil pump body B) - (outer diameter of inner rotor A)
Standard Oil Pump
Regulator Valve





1.Visually inspect components for wear and damage.
2.Check oil pressure regulator valve sliding surface and valve spring.
3.Coat regulator valve with engine oil. Check that it falls smoothly into the valve hole by its own weight.
If damaged, replace regulator valve set or oil pump body.
Regulator Valve Clearance





(Regulator valve to oil pump cover clearance) = D (Valve hole diameter) - E (Outer diameter of valve)
Standard Regulator Valve
LU
If it exceeds the standard, replace the oil pump body.

CAUTION:
Coat regulator valve with engine oil.
Check that it falls smoothly into the valve hole by its own weight.

Assembly






Assembly is in the reverse order of disassembly.
- Assemble the outer rotor in the correct vane orientation to rotation as noted during disassembly, and the inner rotor with the groove on the oil pump cover side.

CAUTION:
Before assembly apply new engine oil to the parts as specified.