Oil Pump Overhaul

OVERHAUL





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





2. REMOVE OIL PUMP ROTOR SET
a. Remove the 10 screws, pump body cover and the drive and driven rotors.





3. INSPECT OIL PUMP RELIEF VALVE
a. Coat the valve with engine oil and check that it falls smoothly into the valve hole under its own weight.
If it does not, replace the relief valve. If necessary, replace the oil pump assembly.
4. INSPECT OIL PUMP ROTOR SET





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





b. Inspect the rotors for tip clearance.
1 Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
Standard tip clearance: 0.060 to 0.180 mm (0.0024 to 0.0071 inch)
Maximum tip clearance: 0.18 mm (0.0071 inch)
If the tip clearance is greater than the maximum, replace the rotors as a set.





c. Inspect the rotors for side clearance.
1 Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
Standard side clearance: 0.030 to 0.090 mm (0.0012 to 0.0035 inch)
Maximum side clearance: 0.09 mm (0.0035 inch)
If the side clearance is greater than the maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.





d. Inspect the rotor for body clearance.
1 Using a feeler gauge, measure the clearance between the driven rotor and body.
Standard body clearance: 0.250 to 0.325 mm (0.0098 to 0.0128 inch)
Maximum body clearance: 0.325 mm (0.0128 inch)
If the body clearance is greater than the maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
5. INSTALL OIL PUMP ROTOR SET





a. Place the drive and driven rotors into the 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.)





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