Oil Pump Overhaul

DISASSEMBLY





1. REMOVE RELIEF VALVE
Remove the plug, compression spring and relief valve.





2. REMOVE DRIVE AND DRIVEN ROTORS
Remove the 10 screws, pump body cover, the drive and driven rotors.

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. PLACE DRIVE AND DRIVEN ROTORS INTO OIL PUMP BODY
Place the drive and driven rotors into the oil pump body with the mark facing upward.





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





Tip clearance:

If the tip clearance is greater than maximum, replace the rotors as a set.





4. INSPECT ROTOR SIDE CLEARANCE
Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.





Side clearance:

If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.





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





Body clearance:

If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
6. REMOVE DRIVE AND DRIVEN ROTORS

REPLACEMENT
REPLACE CRANKSHAFT FRONT OIL SEAL

REASSEMBLY





1. INSTALL DRIVE AND DRIVEN ROTORS
a. Place the drive and driven rotors into pump body with the marks facing the pump body cover side.
b. Install the oil pump body cover with the 10 screws.
Torque: 10 Nm (105 kgf-cm, 7 ft. lbs.)





2. INSTALL RELIEF VALVE
a. Insert the relief valve, compression spring into the oil pump body hole:
b. Install the plug.
Torque: 49 Nm (500 kgf-cm, 36 ft. lbs.)