Oil Pump: Service and Repair

OIL PUMP





Removal and Installation

REMOVAL
1. Remove engine assembly from vehicle.
2. Remove front cover.
3. Remove oil pump drive spacer.





^ Set bolts in the two bolt holes [M6 x pitch 1.0 mm (0.04 inch)] on the front surface. Using suitable puller, pull oil pump drive spacer off from crankshaft.

NOTE: The dimension between the centers of the two bolt holes is 33 mm (1.30 inch).

In the figure, a commercial steering puller is used.
4. Remove oil pump.

INSTALLATION
1. Install the oil pump.
2. Install oil pump drive spacer as follows:





a. Insert oil pump drive spacer according to the directions of crank shaft key and the two flat surfaces of oil pump inner rotor.
^ If the positional relationship does not allow the insertion, rotate oil pump inner rotor with a finger to allow spacer.
b. After confirming that the position of each part is in correct condition to allow for spacer, force fit spacer by lightly tapping with plastic hammer until it contacts and does not go further.
3. Install in the reverse order of removal after this step.

INSPECTION AFTER INSTALLATION
1. Check the engine oil level.
2. Start engine, and check there is no leak of engine oil.
3. Stop engine and wait for 15 minutes.
4. Check the engine oil level and adjust 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 - 0.200 mm (0.0045 - 0.0079 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 : 0.030 - 0.090 mm (0.0012 - 0.0035 inch)
^ Calculate the clearance between oil pump inner rotor and oil pump body as follows:

OIL PUMP INNER ROTOR OUTER DIAMETER





^ Measure the outer diameter of protruded portion of oil pump inner rotor with micrometer. (Position 5)

OIL PUMP BODY INNER DIAMETER

7F�:

^ Measure the inner diameter of oil pump body with inside micrometer. (Position 6)

OIL PUMP INNER DIAMETER 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 the measured/calculated values are out of the standard. replace oil pump assembly.

Regulator Valve Clearance








(Clearance) = Do (Valve hole diameter) - Do (Regulator valve outer diameter of valve)
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 regulator valve hole by its own weight.

ASSEMBLY
Note the following and assemble in the reverse order of disassembly.
^ Install oil pump inner rotor and oil pump outer rotor with the punched marks on the oil pump cover side.