Overhaul
DISASSEMBLYRemove 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) Using the ST, install the front oil seal.
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) Install the oil pump cover.
Tightening torque:
T1: 5.4 N-m (0.6 kgf-m, 4.0 ft-lb)
T2: 44 N-m (4.5 kgf-m, 32.5 ft-lb)
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 case to measure the clearance between the oil pump inner rotor and the oil pump cover as shown in the figure. If the clearance is out of specification, replace the rotors and 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)
OIL PUMP CASE
Check for worn shaft hole, clogged oil passage, worn rotor chamber, cracks and other faults.
FRONT OIL SEAL
Check the front oil seal lips for deformation and hardening, wear.