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) Install the inner and outer rotors.
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 Nm (0.6 kgf-m, 4.0 ft-lb)
T2: 44 Nm (4.5 kgf-m, 32.5 ft-lb)
INSPECTION
TIP CLEARANCE
Measure the tip clearance of rotors. If the clearance is out of standard, replace the rotors as a set.
Tip clearance between inner and outer rotors:
Standard:
0.04 - 0.14 mm (0.0016 - 0.0055 in)
CASE CLEARANCE
Measure the clearance between outer rotor and oil pump case. If clearance is out of standard, replace the oil pump case.
Case clearance between outer rotor and pump case:
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 inner rotor and the oil pump cover as shown in the figure. If clearance is out of standard, replace the rotor or the oil pump case.
Side clearance between inner rotor and pump case:
Standard:
0.02 - 0.07 mm (0.0008 - 0.0028 in)
