Oil Pump Assembly Overhaul

DISASSEMBLY





1. REMOVE RELIEF VALVE
a. Using snap ring pliers, remove the snap ring.
b. Remove the retainer, spring and relief valve.





2. REMOVE DRIVE AND DRIVEN ROTORS
Remove the 2 bolts, pump body cover, O-ring, the drive and driven rotors.
Torque: 8.8 Nm ( 90 kgf-cm, 78 inch lbs.)

HINT:
- Place the drive and driven rotors into pump body with the marks facing the pump body side.
- Use a new O-ring.

INSPECTION





1. INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls smoothly into the valve hole by its own weight.
If it doesn't, replace the relief valve. If necessary, replace the oil pump assembly.
2. INSPECT DRIVE AND DRIVEN ROTORS





3. INSPECT ROTOR BODY CLEARANCE
Using a feeler gauge, measure the clearance between the driven rotor and body.
Standard body clearance: 0.10 - 0.16 mm (0.0039 - 0.0063 inch)
Maximum body clearance: 0.20 mm (0.0079 inch)
If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.





4. INSPECT ROTOR TIP CLEARANCE
Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
Standard tip clearance: 0.04 - 0.16 mm (0.0016 - 0.0063 inch)
Maximum tip clearance: 0.20 mm (0.0079 inch)
If the tip clearance is greater than maximum, replace the rotors as a set.

REPLACEMENT





1. REMOVE OIL SEAL
Using a screwdriver, pry out the oil seal.





2. INSTALL OIL SEAL
a. Using SST and a hammer, tap in a new oil seal until its surface is flush with the oil pump cover edge.
SST 09950-60010 (09951-00310), 09950-70010 (09951-07100)
b. Apply MP grease to the oil seal lip.
3. REPLACE CRANKSHAFT FRONT OIL SEAL

REASSEMBLY
Reassembly is in the reverse order of disassembly.