Oil Pump: Testing and Inspection

Oil Pump

INSPECTION
TIP CLEARANCE
Measure the tip clearance of rotors. If the clearance exceeds the limit, replace rotors as a matched set.





CASE CLEARANCE
Measure the clearance between outer rotor and oil pump case. If the clearance exceeds the limit, replace the rotor.





SIDE CLEARANCE
Measure the clearance between oil pump inner rotor and oil pump cover. If the clearance exceeds the limit, replace rotor or oil pump case.





OIL RELIEF VALVE
Check the valve for assembly 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 lb)

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.