Oil Pump: Service and Repair

OIL PUMP

Removal and Installation
REMOVAL
1. Remove oil pans (lower and upper) and oil strainer. Refer to "OIL PAN AND OIL STRAINER".
2. Remove front timing chain case and timing chain (primary). Refer to "TIMING CHAIN".
3. Remove oil pump assembly.

INSTALLATION
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. Check the engine oil level. Refer to "ENGINE OIL".
2. Start engine, and check there is no leaks of engine oil.
3. Stop engine and wait for 10 minutes.
4. Check the engine oil level and add engine oil. Refer to "ENGINE OIL".

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 - 0.260 mm (0.0045 - 0.0102 inch)
- Tip clearance between oil pump inner rotor and oil pump outer rotor (Position "2")
Standard: Below 0.180 mm (0.0071 inch)





^ 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 inch)
- Side clearance between oil pump outer rotor and oil pump body (Position "4")
Standard: 0.050 - 0.110 mm (0.0020 - 0.0043 inch)
^ Calculate the clearance between oil pump inner rotor and oil pump body as follows:

OIL PUMP BODY INNER DIAMETER





- Measure the inner diameter of oil pump body with inside micrometer. (Position"5")

OIL PUMP INNER ROTOR OUTER DIAMETER
- Measure the outer diameter of protruded portion of oil pump inner rotor with micrometer. (Position "6")

OIL PUMP INNER ROTOR 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 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 the calculated value is 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 oil pump inner rotor with the groove faced to oil pump cover side.