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. Inspect drive and driven rotors.
a. Place the drive and driven rotors into the oil pump body.





b. Inspect the rotors for the body clearance.
Using a feeler gauger, measure the clearance between the drive and driven rotor tips.

Standard tip clearance: 0.060 - 0.180 mm (0.0024 - 0.0071 inch)
Maximum tip clearance: 0.18 mm (0.0071 inch)

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





c. Inspect the rotors for the side clearance.
Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.

Standard body clearance: 0.030 - 0.090 mm (0.0012 - 0.0035 inch)
Maximum body clearance: 0.09 mm (0.0035 inch)

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





d. Inspect the rotor for the body clearance.
Using a feeler gauge, measure the clearance between the driven rotor and body.

Standard body clearance: 0.250 - 0.325 mm (0.0098 - 0.0128 inch)
Maximum body clearance: 0.325 mm (0.0128 inch)

If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
e. Remove the drive and drive 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 pump body cover with the 10 screws.

Torque: 10 Nm (7 ft. lbs.)





2. Install relief valve.
a. Insert the relief valve and compression spring into the oil pump body hole.
b. Install the plug.

Torque: 49 Nm (36 ft. lbs.)