Oil Pump: Service and Repair

OIL PUMP

Removal and Installation
1. To remove the oil pump, remove the front cover. Refer to TIMING CHAIN.
^ Only perform the steps necessary to remove the front cover.
2. Installation is in the reverse order of removal.






Disassembly and Assembly

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

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

INSPECTION AFTER DISASSEMBLY





1. Measuring the internal clearance of the oil pump components.
^ Measure the clearance with a feeler gauge.
Clearance between outer rotor and oil pump body (position 1):
Standard clearance: 0.114 - 0.179 mm (0.0045 - 0.0070 inch)
Tip clearance between inner rotor and outer rotor (position 2):
Standard clearance: Less than 0.220 mm (0.0087 inch)





^ Measure clearance with feeler gauge and straightedge.
Side clearance between inner rotor and oil pump body (position 3):
Standard clearance: 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
^ Side clearance between outer rotor and oil pump body (position 4):
Standard clearance: 0.060 - 0.110 mm (0.0024 - 0.0043 inch)
^ Calculate the clearance between inner rotor and oil pump body as follows.





2. Measure the outer diameter of protruded portion of inner rotor (Position 5).





3. Measure the inner diameter of oil pump body with an inside micrometer (Position 6).
(Clearance) = (Inner diameter of oil pump body) - (Outer diameter of inner rotor):
Standard clearance: 0.035 - 0.070 mm (0.0014 - 0.0028 inch)





4. Measure the regulator valve clearance.
(Clearance) = D1 (Valve hole diameter) - D2 (Outer diameter of valve):
Standard clearance: 0.040 - 0.097 mm (0.0016 - 0.0038 inch)

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

ASSEMBLY





^ Assembly is in the reverse order of disassembly.
^ Install the inner rotor and outer rotor with the punched marks on the oil pump cover side.