Oil Pump: Service and Repair

OIL PUMP

Removal and Installation

Exploded View LU-13:

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

INSTALLATION
Installation is in the reverse order of removal, paying attention to the following.
^ When installing, align crankshaft flat faces with inner rotor flat faces.

INSPECTION AFTER INSTALLATION
1. Check the engine oil level.
2. Start engine, and check there are no leaks of engine oil.
3. Stop engine and wait for 10 minutes.
4. Check the engine oil level and add 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 springs 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: 0.120 - 0.195 mm (0.0047 - 0.0077 in)
- Tip clearance between oil pump inner rotor and oil pump outer rotor (position "2")
Standard: 0.06 - 0.16 mm (0.0024 - 0.0063 in)





^ 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: 0.05 - 0.09 mm (0.0020 - 0.0035 in)
^ 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 in)
^ 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: 0.025 - 0.070 mm (0.0010 - 0.0028 in)
^ 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 and oil pump outer rotor with the punch mark to oil pump cover side.