Oil Pump: Service and Repair

OIL PUMP





Removal and Installation

REMOVAL
1. Remove the timing chain. Refer to "Removal and Installation".
2. Remove the oil strainer.
3. Remove the oil pump.

INSTALLATION
Installation is in the reverse order of removal.





Disassembly and Assembly

INSPECTION AFTER DISASSEMBLY

Clearance of Oil Pump Parts





^ Measure the rotor clearance with a feeler gauge as shown.
- Clearance between outer rotor and oil pump body (position 1).
Position 1 : 0.114 - 0.200 mm (0.0045 - 0.0079 inch)
- Tip clearance between inner rotor and outer rotor (position 2).
Position 2 : less than 0.180 mm (0.0071 inch)





^ Measure the rotor clearance with a feeler gauge and straightedge as shown.
- Side clearance is between the inner rotor and the oil pump body (position 3).
Position 3 : 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
- Side clearance is between the outer rotor and the oil pump body (position 4).
Position 4 : 0.050 - 0.110 mm (0.0020 - 0.0043 inch)





^ Calculate the clearance between inner rotor and oil pump body as follows.
- Measure the outer diameter of protruded portion of inner rotor (position A).
- Measure the inner diameter of oil pump body with inside micrometer (position B).
- Clearance 5 = (inner diameter of oil pump body B) - (outer diameter of inner rotor A).
Clearance 5 : 0.045 - 0.091 mm (0.0018 - 0.0036 inch)

Regulator Valve





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

Regulator Valve Clearance





^ Clearance 6 = (regulator valve hole diameter D) - (outer regulator valve diameter E).
^ If the calculated clearance 6 exceeds the standard, replace the oil pump body.

Clearance 6 : 0.040 - 0.097 mm (0.0016 - 0.0038 inch)

CAUTION:
^ Coat the regulator valve with clean 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 inner rotor and outer rotor with the punch marks on the oil pump cover side.