Overhaul
Oil Pump: Disassembly and AssemblyDISASSEMBLY
1) Remove oil pump cover.
2) Remove inner rotor and outer rotor from oil pump body.
3) Remove the regulator valve plug, regulator valve spring and regulator valve.
INSPECTION AFTER DISASSEMBLY
Clearance of Oil Pump Part.
^ Measure radial clearance using a suitable tool.
Body to outer rotor (position 1) :0.120 - 0.195 mm (0.0047 - 0.0077 in)
Inner rotor to outer rotor tip (position 2) :0.060 - 0.160 mm (0.0024 - 0.0063 in)
^ Measure side clearance using suitable tools.
Body to inner rotor (position 3) :0.030 - 0.070 mm (0.0012 - 0.0028 in)
Body to outer rotor (position 4): 0.050 - 0.090 mm (0.0020 - 0.0035 in)
^ Calculate the clearance between inner rotor and oil pump body as follows.
1) Measure the inner diameter of oil pump body to brazed portion (position 5) using suitable tool.
2) Measure the outer diameter of protruded portion of inner rotor (position 6) using suitable tool.
3) Calculate the clearance using the following formula.
^ (Clearance) = (Inner diameter of oil pump body) - (Outer diameter of inner rotor)
Inner rotor to brazed portion of housing clearance :0.045 - 0.091 mm (0.0018 - 0.0036 in)
Regulator Valve Clearance
Check regulator valve to oil pump cover clearance using the following formula.
^ (Clearance) = D1 (Valve hole diameter) - D2 (Outer Diameter of valve)
Regulator valve to oil pump cover
:0.025 - 0.070 mm (0.0010 - 0.0028 in)
CAUTION:
^ Coat regulator valve with engine oil.
^ Check that it falls smoothly into the regulator valve hole by its own weight.
ASSEMBLY
Installation is in the reverse order of removal.
NOTE:
Install oil pump inner rotor with the groove faced and oil pump outer rotor with the punch mark to oil pump cover side.
