Oil Pump: Testing and Inspection

2ZR-FE LUBRICATION: OIL PUMP: INSPECTION

INSPECTION

1. INSPECT OIL PUMP RELIEF VALVE





(a) Check the relief valve.
(1) Coat the valve with engine oil, and then check that the valve falls smoothly into the valve hole under its own weight.
If the valve does not fall smoothly, replace the relief valve. If necessary, replace the oil pump assembly.
2. INSPECT OIL PUMP ASSEMBLY





(a) Check the side clearance.
(1) Using a feeler gauge and precision straightedge, measure the clearance between the rotors and precision straightedge.
Standard clearance:
0.030 to 0.080 mm (0.0012 to 0.0031 in.)
Maximum clearance:
0.16 mm (0.0063 in.)
If the side clearance is greater than the maximum, replace the oil pump assembly.





(b) Check the rotor tip clearance.
(1) Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
Standard tip clearance:
0.08 to 0.16 mm (0.0032 to 0.0063 in.)
Maximum tip clearance:
0.35 mm (0.0138 in.)
If the tip clearance is greater than the maximum, replace the oil pump assembly.





(c) Check the rotor body clearance.
(1) Using a feeler gauge, measure the clearance between the driven rotor and the oil pump body.
Standard body clearance:
0.12 to 0.19 mm (0.0048 to 0.0074 in.)
Maximum body clearance:
0.325 mm (0.0128 in.)
If the body clearance is greater than the maximum, replace the oil pump assembly.