Oil Pump: Service and Repair

OIL PUMP





Removal and Installation
REMOVAL
1. Remove oil pans (lower and upper) and oil strainer.
2. Remove front timing chain case and timing chain (primary).
3. Remove oil pump assembly.

INSTALLATION

CAUTION: Before installation, apply new engine oil to the parts as instructed in the figure.

Note the following, and install in the reverse order of removal.
^ When installing, align crankshaft flat faces with inner rotor flat faces.

INSPECTION AFTER INSTALLATION
1. After warming up engine, check for engine oil leakage.
2. Check the engine oil level and adjust engine oil.

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

INSPECTION AFTER DISASSEMBLY
Clearance of Oil Pump Parts





^ Measure the clearance with feeler gauge.
- Clearance between outer rotor and oil pump body (position 1)
Standard: 0.114 - 0.260 mm (0.0045 - 0.0102 inch)
- Tip clearance between inner rotor and outer rotor (position 2)
Standard: Below 0.180 mm (0.0071 inch)





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





^ Calculate the clearance between inner rotor and oil pump body as follows:
- Measure the inner diameter of oil pump body with inside micrometer (Position 5)
- Measure the outer diameter of protruded portion of inner rotor with micrometer (Position 6)
- (Clearance) = (Inner diameter of oil pump body) - (Outer diameter of inner rotor)
Standard: 0.045 - 0.091 mm (0.0018 - 0.0036 inch)
^ If measured/calculated values are out of the standard, replace oil pump assembly.

Regulator Valve Clearance





(Clearance) = (Valve hole diameter) - (Regulator valve outer diameter)
Standard: 0.040 - 0.097 mm (0.0016 - 0.0038 inch)
^ If out of the standard, replace oil pump assembly.

CAUTION:
^ Coat regulator valve with engine oil.
^ Make sure that it falls smoothly into valve hole by its own weight.

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





^ Install inner rotor with the groove faced to oil pump cover side.