Oil Pump: Service and Repair

Removal and Installation
REMOVAL





1. Remove front cover. Refer to "TIMING CHAIN".
2. Remove the oil pump drive spacer.
3. Remove the oil pump.

INSTALLATION
Installation is in the reverse order of removal, paying attention of the following:





^ When inserting the oil pump drive spacer, align the crankshaft key and the flat face of the inner rotor.
^ If they are not aligned, rotate the oil pump inner rotor by hand.
^ Make sure that the each part is aligned and tap lightly until it reaches the end.

INSPECTION AFTER INSTALLATION
^ Start the engine, and check for leaks of engine oil.
^ Stop engine and wait 10 minutes.
^ Check level and add engine oil as required. Refer to "ENGINE OIL".

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

INSPECTION AFTER DISASSEMBLY
Clearance of Oil Pump Parts





^ Measure radial clearance using a suitable tool.
Body to outer rotor (position 1) : 0.114 - 0.200 mm (0.0045 - 0.0079 inches)
Inner rotor to outer rotor tip (position 2) : Below 0.180 mm (0.0071 inches)





^ Measure side clearance using suitable tools.
Body to inner rotor (position 3) :0.030 - 0.070 mm (0.0012 - 0.0028 inches)
Body to outer rotor (position 4) : 0.030 - 0.090 mm (0.0012 - 0.0035 inches)





^ Calculate the clearance between inner rotor and oil pump body as follows.
1. Measure the outer diameter of protruded portion of inner rotor (position 5) using suitable tool.





2. Measure the inner diameter of oil pump body to brazed portion (position 6) using suitable tool.
3. Calculate the clearance using the following formula.
^ (Clearance) = (Inner diameter of oil pump body) - (Outer diameter of inner rotor)
Inner rotor to brazed portion of housing clearance : 0.045 - 0.091 mm (0.0018 - 0.0036 inches)

Regulator Valve Clearance
Check regulator valve to oil pump cover clearance using the following formula.





^ (Clearance) = D1 (Valve hole diameter) - D2 (Outer Diameter of valve)
Regulator valve to oil pump cover : 0.040 - 0.097 mm (0.0016 - 0.0038 inches)

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

ASSEMBLY





Installation is in the reverse order of removal.

NOTE: Install the inner rotor and outer rotor with the punched marks on the oil pump cover side.