Oil Pump: Testing and Inspection

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

Tip Clearance:
Standard: 0.04 - 0.14 mm (0.0016 - 0.0055 inch)
Limit: 0.18 mm (0.0071 inch)





CASE CLEARANCE
Measure the clearance between the outer rotor and the cylinder block rotor housing. If the clearance exceeds the limit, replace the rotor.

Case Clearance:
Standard: 0.10 - 0.175 mm (0.0039 - 0.0069 inch)
Limit: 0.20 mm (0.0079 inch)





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

Side Clearance:
Standard: 0.02 - 0.07 mm (0.0008 - 0.0028 inch)
Limit: 0.15 mm (0.0059 inch)

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.