Oil Pump: Service and Repair

REMOVAL
1. REMOVE CYLINDER HEAD ASSEMBLY
2. REMOVE WATER INLET AND WATER INLET HOUSING
a. Remove the 2 nut, water inlet and thermostat.
b. Remove the bolt and water inlet housing and gasket.
3. REMOVE TIMING CHAIN COVER

DISASSEMBLY





1. REMOVE DRIVE AND DRIVEN ROTORS
Remove the 9 screws, pump cover, drive rotor, driven rotor and O-ring.
2. REMOVE RELIEF VALVE
a. Using snap ring pliers, remove the snap ring.
b. Remove the retainer, spring(s) and relief valve.

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 does not, replace the relief valve. If necessary, replace the oil pump assembly.





2. INSPECT ROTOR BODY CLEARANCE
Using a thickness gauge, measure the clearance between the driven rotor and body.
Standard body clearance: 0.100 - 0.175 mm (0.0039 - 0.0069 inch)
Maximum body clearance: 0.30 mm (0.0118 inch)
If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.





3. INSPECT ROTOR SIDE CLEARANCE
Using a thickness 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: 0.15 mm (0.0059 inch)
If the side 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 thickness gauge, measure the clearance between the drive and driven rotor tips.
Standard tip clearance: 0.110 - 0.240 mm (0.0043 - 0.0094 inch)
Maximum tip clearance: 0.25 mm (0.0098 inch)
If the tip clearance is greater than maximum, replace the rotors as a set.

REPLACEMENT
REPLACE CRANKSHAFT FRONT OIL SEAL

HINT: There are 2 methods (a and b) to replace the oil seal which are as follows:

a. IF OIL PUMP IS REMOVED FROM CYLINDER BLOCK





1. Using a screwdriver and a hammer, tap out the oil seal.





2. Using Special Service Tool (SST) and a hammer, tap in a new oil seal until its surface is flush with the oil pump case edge.
(SST) 09223-50010
3. Apply MP grease to the oil seal lip.
b. IF OIL PUMP IS INSTALLED CYLINDER BLOCK





1. Using a screwdriver, pry out the oil seal.

NOTICE: Be careful not to damage the crankshaft. Tape the screwdriver tip.

2. Apply MP grease to a new oil seal lip.





3. Using SST and a hammer, tap in the oil seal until its surface is flush with the oil pump case edge.
SST 09223-50010

REASSEMBLY
1. INSTALL RELIEF VALVE





a. Install these parts:
1. Relief valve
2. Spring(s)
3. Retainer Using snap ring pliers, install the snap ring.
2. INSTALL DRIVE AND DRIVEN ROTORS





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





b. Place a new O-ring to the pump body.
c. Install the pump cover with the 9 screws.

INSTALLATION
1. INSTALL TIMING CHAIN COVER
2. INSTALL WATER INLET AND WATER INLET HOUSING
3. INSTALL CYLINDER HEAD ASSEMBLY