Oil Pump: Testing and Inspection

INSPECTION
TIP CLEARANCE





Measure the tip clearance of rotors. If the clearance is out of the standard value, replace the rotors as a matched set.

CASE CLEARANCE





Measure the clearance between the outer rotor and oil pump rotor housing. If the clearance is out of the standard value, replace the oil pump case.

SIDE CLEARANCE





Measure the clearance between oil pump inner rotor and pump cover. If the clearance is out of the standard value, replace the rotor or oil pump case.

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 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.