Oil Pump Overhaul

DISASSEMBLY





1. REMOVE RELIEF VALVE
a. Carefully mount the pump body in a soft jaw vise.
b. Remove the plug, gasket, compression spring and relief valve.

NOTICE: Be careful not to damage the pump body.





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 under 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 drive and driven rotors into oil pump body.

HINT: 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 rotors.

Standard tip clearance: 0.060 - 0.240 mm (0.0024 - 0.0094 inch)
Maximum tip clearance: 0.30 mm (0.0118 inch)

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





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

Standard body clearance: 0.100 - 0.175 mm (0.0039 - 0.0069 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.





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

Standard side clearance: 0.030 - 0.090 mm (0.0012 - 0.0035 inch)
Maximum side clearance: 0.12 mm (0.0047 inch)

If the side 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 oil pump body with the mark facing upward.





b. Install the pump body cover with the 10 screws.

Torque: 10 Nm (8 ft. lbs.)





2. INSTALL RELIEF VALVE
a. Carefully mount the pump body in a soft jaw vise.

NOTICE: Be careful not to damage the pump body.

b. Insert the relief valve and compression spring into the oil pump body hole.
c. Install the plug with a new gasket.

Torque: 49 Nm (36 ft. lbs.)