Oil Pump: Testing and Inspection

INSPECTION
TIP CLEARANCE





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

CASE CLEARANCE





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

SIDE CLEARANCE





Measure the clearance between oil pump inner rotor and pump cover. If the clearance exceeds the standard value, replace the rotor or pump body.

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 73.7 mm (2.902 inch)
Installed length 54.7 mm (2.154 inch)
Load when installed 93.1 N (9.49 kgf, 20.88 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.