Oil Pump

1. Check oil pump case for damage. Remove rear oil pump cover.
2. Remove pump rotors and inspect case for excessive wear.

Inner Rotor To Case:

3. Measure clearance between case and inner rotor.

Measuring Clearance Between Outer Rotor Case:

4. Insert the rotor into the oil pump case and measure clearance between outer rotor and case with a feeler gauge. Replace if out of specifications.

Measuring Clearance Between Rotors:

5. Using a feeler gauge, measure clearance between inner rotor tip and outer rotor. Clearance specification is: 0.06-0.18 mm (0.003-0.007 inch). Replace both rotors if not within specifications.

Measuring Clearance Over Rotors:

6. Place a straightedge across face of pump housing. Clearance specification is: 0.04-0.10 mm (0.0015-0.0039 inch). Replace oil pump assembly if not within specifications.

OIL RELIEF PLUNGER
1. Check that the oil relief plunger slides smoothly.
2. Check for broken relief spring.