Overhaul

OIL PUMP


Disassembly and Assembly


DISASSEMBLY
1. Remove oil pump cover.
2. Remove oil pump inner rotor and oil pump outer rotor from oil pump body.
3. After removing regulator valve plug, remove regulator valve spring, and regulator valve.

INSPECTION AFTER DISASSEMBLY

Oil Pump Clearance
- Measure the clearance with feeler gauge.





- Clearance between oil pump outer rotor and oil pump body (Position 1)

Standard : 0.114 - 0.200 mm (0.0045 - 0.0079 in)m

- Tip clearance between oil pump inner rotor and oil pump outer rotor (Position 2)

Standard : Below 0.180 mm (0.0071 in)

- If out of the standard, replace inner rotor and outer rotor.
- Measure the clearance with feeler gauge and straightedge.





- Side clearance between oil pump inner rotor and oil pump body
(Position 3)

Standard : 0.030 - 0.070 mm (0.0012 - 0.0028 in)

- Side clearance between oil pump outer rotor and oil pump body
(Position 4)

Standard : 0.030 - 0.090 mm (0.0012 - 0.0035 in)

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

OIL PUMP INNER ROTOR OUTER DIAMETER
- Measure the outer diameter of protruded portion of oil pump inner rotor with micrometer. (Position 5)






OIL PUMP BODY INNER DIAMETER
- Measure the inner diameter of oil pump body with inside micrometer. (Position 6)

OIL PUMP INNER DIAMETER TO OIL PUMP BODY CLEARANCE
- (Clearance) = (Oil pump body inner diameter) � (Oil pump inner rotor outer diameter)






Standard : 0.045 - 0.091 mm (0.0018 - 0.0036 in)

- If the measured/calculated values are out of the standard, replace oil pump assembly.

Regulator Valve Clearance
(Clearance) = D1 (Valve hole diameter) � D2 (Regulator valve outer diameter of valve)






Standard : 0.040 - 0.097 mm (0.0016 - 0.0038 in)

- If the calculated value is out of the standard, replace oil pump assembly.

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

ASSEMBLY
Note the following, and assemble in the reverse order of disassembly.





- Install oil pump inner rotor and oil pump outer rotor with the punched marks on the oil pump cover side.