Overhaul

DISMANTLING
- Remove the oil pump.
- Unscrew the four bolts and detach the bottom cover.
- Withdraw the inner and outer rotors from the oil pump body.

NOTE: Do not attempt to separate the inner rotor from the shaft.

INSPECTION
- Thoroughly clean all components.





Figure 53

- Check that the clearance between the lobes of the inner and outer rotors (1, Fig. 53) does not exceed 0.15 mm (0.006 in).





Figure 54

- Check that the clearance between outer rotor and pump body (1, Fig 54) does not exceed 0.25 mm (0.010 in).





Figure 55

- Check that the end-float of the rotors (1, Fig. 55) does not exceed 0.06 mm (0.0025 in).

NOTE: If necessary the outer rotor and/or body may be lapped on a surface plate to rectify.

- Examine all components for signs of scoring or wear.
- Ensure that the inner rotor is tight on the drive shaft.

NOTE: Inner rotor drive shaft and outer rotor are only available as an assembly.

- Renew the O-ring seals in the pump body.

REASSEMBLING
- Assemble the inner rotor to the body.
- Assemble the outer rotor to the body ensuring that the chamfered end is inserted first.
- Secure the bottom cover using four bolts and lock washers.
- Fit the oil pump.