OIL PUMP INSPECTION
EG09B–01
1. INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls smoothly
into the valve hole by its own weight.
If it does not, replace the relief valve. If necessary, replace the
oil pump assembly.
2. INSPECT DRIVE AND DRIVEN ROTORS
A. Inspect rotor body clearance
Using a thickness gauge, measure the clearance between
the driven rotor and body.
Standard body clearance:
0.100–0.175 mm (0.0039–0.0069 in.)
Maximum body clearance:
0.30 mm (0.0118 in.)
If the body clearance is greater than maximum, replace the
rotors as a set. If necessary, replace the oil pump assembly.
B. Inspect rotor side clearance
Using a thickness gauge and precision straight edge, mea-
sure the clearance between the rotors and precision straight
edge.
Standard side clearance:
0.030–0.090 mm (0.0012–0.0035 in.)
Maximum side clearance:
0.15 mm (0.0059 in.)
If the side clearance is greater than maximum, replace the ro-
tors as a set. If necessary, replace the oil pump assembly.
–ENGINE TROUBLESHOOTING LUBRICATION SYSTEM
EG–299
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