Oil Pump Assembly Overhaul

DISASSEMBLY





1. REMOVE DRIVEN AND DRIVE ROTORS
a. Remove the 8 screws and pump body cover.
b. Remove the drive and driven rotors.





2. REMOVE RELIEF VALVE
a. Unscrew the relief valve plug and gasket.
b. Remove the spring and relief valve.

INSPECTION





1. INSPECT RELIEF VALVE
Coat the relief valve with engine oil and check that it falls smoothly into the valve hole by its own weight.
If the valve does not fall smoothly, replace the valve and/or oil pump assembly.





2. INSPECT BODY CLEARANCE
Using a feeler gauge, measure the clearance between the driven rotor and pump body.





Body clearance:

If the clearance is greater than the maximum, replace the oil pump rotor set and/or pump body.





3. INSPECT TIP CLEARANCE
Using a feeler gauge, measure the clearance between the drive and driven rotors.





Tip clearance:

If the clearance is greater than the maximum, replace the oil pump rotor set.





4. INSPECT SIDE CLEARANCE
Using a feeler gauge and precision straight edge, measure the side clearance, as shown.





Side clearance:

If the clearance is greater than the maximum, replace the oil pump rotor set and/or pump body.

REPLACEMENT
REPLACE CRANKSHAFT FRONT OIL SEAL

HINT: There are 2 methods (a and b) to replace the oil seal, which are as follows:

a. If oil pump is removed from cylinder block:





1. Using a screwdriver, pry out the oil seal.





2. Using SST and a hammer, tap in a new oil seal until its surface is flush with the oil pump body edge.
SST 09309-37010
3. Apply MP grease to the oil seal lip.
b. If oil pump is installed to the cylinder block:





1. Using a knife, cut off the oil seal lip.
2. Using a screwdriver, pry out the oil seal.

NOTICE: Be careful not to damage the crankshaft. Tape the screwdriver tip.

3. Apply MP grease to a new oil seal lip.





4. Using SST and a hammer, tap in the oil seal until its surface is flush with the oil pump body edge.
SST 09309-37010

REASSEMBLY





1. INSTALL RELIEF VALVE
Install the relief valve, spring and plug.
2. INSTALL DRIVEN AND DRIVE ROTORS





a. Place the drive and driven rotors into the pump body with the marks facing the pump body cover side.





b. Install the pump body cover with the 8 bolts.
Torque: 10 Nm (105 kgf-cm, 8 ft. lbs.)