Oil Pump: Service and Repair

Oil Pump

COMPONENT (Except for STI model) (Part 1):

COMPONENT (Except for STI model) (Part 2):

COMPONENT (STI model):

REMOVAL
1) Set the vehicle on a lift.
2) Disconnect the ground cable from the battery.





3) Lift up the vehicle.
4) Remove the under cover.
5) Remove the bolts which install water pipe of oil cooler to oil pump.





6) Remove the water pipe and hoses between oil cooler and water pump.





7) Lower the vehicle.
8) Remove the radiator.
9) Remove the crankshaft position sensor.





10) Remove the V-belts.
11) Remove the belt tensioner.





12) Remove the crank pulley using ST.
ST 499977100 CRANK PULLEY WRENCH





13) Remove the water pump.
14) Remove the timing belt guide. (MT model)





15) Remove the crank sprocket.





16) Remove the bolts which install oil pump onto cylinder block.

NOTE: When disassembling and checking the oil pump, loosen the relief valve plug before removing the oil pump.





17) Remove the oil pump by using flat tip screwdriver.

CAUTION:
Be careful not to scratch mating surfaces of cylinder block and oil pump.





INSTALLATION
Install in the reverse order of removal. Perform the following.
1) Using the ST, install the front oil seal.

NOTE:
Use a new front oil seal.
ST 499587100 OIL SEAL INSTALLER





2) Apply liquid gasket to the mating surfaces of oil pump.





3) Apply a coat of engine oil to the inside of oil seal.





4) Install the oil pump to cylinder block. Be careful not to damage the oil seal during installation.

NOTE:
^ Make sure the oil seal lip is not folded.
^ Align the flat surface of oil pump's inner rotor with crankshaft before installation.
^ Use a new O-ring and oil seal.
^ When disassembly and check of the oil pump was performed, tighten the relief valve plug after attaching the oil pump.

Tightening torque: 44 Nm (4.5 kgf-m, 32.5 ft-lb)
5) Apply liquid gasket to the three bolts thread shown in figure. (When reusing the bolts)





DISASSEMBLY
Remove the screw which secures oil pump cover and then disassemble oil pump. Inscribe alignment marks on the inner and outer rotors so that they can be replaced in their original positions during reassembly.

NOTE:
Before disassembling the oil pump, remove the relief valve.





ASSEMBLY
1) Assemble the front oil seal by using ST.

NOTE:
Use a new front oil seal.
ST 499587100 OIL SEAL INSTALLER





2) Apply a coat of engine oil to inner and outer rotors.
3) Assemble the inner and outer rotors in their original positions.
4) Assemble the oil relief valve and install relief valve spring and plug.

NOTE: Use a new gasket.

5) Assemble the oil pump cover.





INSPECTION

TIP CLEARANCE
Measure the tip clearance of rotors. If the clearance exceeds the limit, replace rotors as a matched set.





CASE CLEARANCE
Measure the clearance between outer rotor and oil pump case. If the clearance exceeds the limit, replace the rotor.





SIDE CLEARANCE
Measure the clearance between oil pump inner rotor and oil pump case. If the clearance exceeds the limit, replace rotor or oil pump case.





OIL RELIEF VALVE
Check the valve for poor assembly condition and damage, and the relief valve spring for damage and deterioration. Replace the parts if defective.
Relief valve spring
Free length: 73.7 mm (2.902 in)
Installed length: 54.7 mm (2.154 in)
Load when installed: 93.1 N (9.49 kgf, 20.88 lbf)

OIL PUMP CASE
Check for worn shaft holes, clogged oil passages, cracks and other faults.

OIL SEAL
Check the oil seal lips for deformation, hardening, wear, etc. and replace if defective.