Oil Pump: Service and Repair

Oil Pump





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) Lower the vehicle.
6) Remove the radiator.
7) Remove the crankshaft position sensor.
8) Remove the water pump.
9) Remove the crank sprocket.





10) 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.





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

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





12) Remove the front oil seal from the oil pump.

INSTALLATION
1) Using the ST, install the front oil seal.
ST 499587100 OIL SEAL INSTALLER

NOTE: Use a new front oil seal.





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

NOTE: Install within 5 min. after applying liquid gasket.

Liquid gasket. THREE BOND 1217G (Part No. K0877Y0100) or equivalent





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





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

NOTE:
^ Make sure the front oil seal lip is not folded.
^ Align the flat surface of oil pump's inner rotor with crankshaft before installation.
^ Use new O-rings.
^ Do not forget to assemble O-rings.

5) Apply liquid gasket to the three bolts thread shown in figure. (when reuse the bolts)





6) Install the crank sprocket.
7) Install the water pump.
8) Install the crankshaft position sensor.
9) Install the radiator.
10) Lift up the vehicle.
11) Install the under cover.
12) Lower the vehicle.
13) Connect the ground cable to the battery.





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.
ST 499587100 OIL SEAL INSTALLER

NOTE: Use a new front oil seal.





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 is out of specification, replace the rotors as a set.
Tip clearance:
Standard: 0.04 - 0.14 mm (0.0016 - 0.0055 in)





CASE CLEARANCE
Measure the clearance between the outer rotor and the oil pump case. If clearance is out of standard, replace the oil pump case.
Case clearance:
Standard: 0.10 - 0.175 mm (0.0039 - 0.0069 in)





SIDE CLEARANCE
Measure the gap between the inner rotor and the oil pump to measure the clearance between the inner rotor and the oil pump cover as shown in the figure. If the clearance is not within the limit, replace the rotor or the oil pump case.
Side clearance:
Standard: 0.02 - 0.07 mm (0.0008 - 0.0028 in)





OIL RELIEF VALVE
Check the valve for 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)

5. OIL PUMP CASE
Check oil pump case for worn shaft holes, clogged oil passages, worn rotor chambers, cracks and other faults.

6. FRONT OIL SEAL
Check the front oil seal lips for deformation and hardening, wear.