Oil Pump

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





Fig. 115

3. Measure clearance between case and inner rotor (Fig. 115).





Fig. 116

4. Insert the rotor into the oil pump case and measure clearance between outer rotor and case with a feeler gauge (Fig. 116). Replace if out of specifications.





Fig. 117

5. Using a feeler gauge, measure clearance between inner rotor tip and outer rotor (Fig. 117). Clearance specification is: 0.06 - 0.18 mm (0.003 - 0.007 inch). Replace both rotors if not within specifications





Fig. 118

6. Place a straightedge across face of pump housing (Fig. 118). 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.