Oil Pump: Testing and Inspection
CLEANINGWash all parts in a solvent and dry them thoroughly with compressed air. Use a brush to clean the inside of the oil pump housing and the pressure relief valve chamber. Remove all dirt and metal particles.
INSPECTION
NOTE: Internal components are not serviced. If any component is out of specification, replace the complete oil pump.
Check the inside of the pump housing, the outer race and rotor for damage or excessive wear.
Check the mating surface of the oil pump cover for wear. Although minor scuff marks are normal, replace the oil pump if the cover mating surface is worn, scored or grooved. Inspect the rotor for nicks, burrs or score marks. Remove minor imperfections with an oil stone.
NOTE: With rotor assembly removed from the oil pump and resting on a flat surface, the inner and outer rotor tip clearance must not exceed 0.30 mm (0.012 inch) with Feeler Gauge Set 303-D027 (D81L-4201-A) or equivalent inserted 13 mm (0.5 inch) minimum.
Measure the inner rotor tip clearance.
With the rotor assembly installed in the housing, place Straight Edge 303-D039 (D83L-4201-A) or equivalent over the rotor assembly and the housing.
Fig. 13 Oil Pump Rotor Endplay Inspection:
Measure the clearance (rotor end play) between Straight Edge 303-D039 (D83L-4201-A) or equivalent and the rotor and outer race. Maximum clearance must not exceed 0.13 mm (0.005 inch).
Inspect the relief valve spring to see if it is collapsed or worn. Check the relief valve spring tension. If the spring tension is not within specification and/or the spring is worn or damaged, replace the oil pump. Check the relief valve piston for free operation in the bore.