Oil Pump: Testing and Inspection
INSPECTIONTIP CLEARANCE
Measure the tip clearance of rotors. If clearance exceeds the standard, replace the rotors as a matched set.
Tip clearance:
Standard 0.04 - 0.14 mm (0.0016 - 0.0055 inch)
Limit 0.20 mm (0.0079 inch)
CASE CLEARANCE
Measure the clearance between the outer rotor and oil pump rotor housing. If clearance exceeds the standard, replace the rotor.
Case clearance:
Standard 0.10 - 0.175 mm (0.0039 - 0.0069 inch)
Limit 0.18 mm (0.0071 inch)
SIDE CLEARANCE
Measure the clearance between the oil pump inner rotor and pump cover. If clearance exceeds the standard, replace the rotor or pump body.
Side clearance:
Standard 0.02 - 0.07 mm (0.0008 - 0.0028 inch)
Limit 0.12 mm (0.0047 inch)
OIL RELIEF VALVE
Check the valve for fitting condition and damage, and the relief valve spring for damage and deterioration. Replace the parts if defective.
Relief valve spring:
Free length 72.8 mm (2.866 inch)
Installed length 54.7 mm (2.154 inch)
Load when installed 81.3 N (8.29 kgf, 18.24 lbs.)
OIL PUMP CASE
Check the oil pump case for worn shaft hole, clogged oil passage, worn rotor chamber, cracks, and other faults.
OIL SEAL
Check the oil seal lips for deformation, hardening, wear, etc. and replace if defective.