Oil Pump

It is necessary to remove the oil pan, oil pickup and chain case cover to service the oil pump rotors. The oil pump pressure relief valve can be serviced by removing the oil pan and oil pickup tube. Refer to Timing Chain Cover.

DISASSEMBLY
OIL PUMP





Fig. 95

1. Remove oil pump cover screws, and lift off cover (Fig. 95).
2. Remove pump rotors (Fig. 95).
3. Wash all parts in a suitable solvent and inspect carefully for damage or wear. Refer to Oil Pump.

OIL PRESSURE RELIEF VALVE
1. Remove the relief valve by drilling a 3.175 mm (1/8 inch) hole into the relief valve retainer cap.
2. Insert a self-threading sheet metal screw into cap.





Fig. 96

3. Clamp screw into a vise and while supporting chain case cover, remove cap by tapping chain case cover using a soft hammer. Discard retainer cap and remove spring and relief valve (Fig. 96).
4. Wash all parts in a suitable solvent and inspect carefully for damage or wear. Refer to Oil Pump.

ASSEMBLY
OIL PUMP
1. Assemble pump, using new parts as required. Install the inner rotor with chamfer facing the oil pump cover (Fig. 95).
2. Tighten cover screws to 12 Nm (105 in. lbs.).
3. Prime oil pump before installation by filling rotor cavity with clean engine oil.

OIL PRESSURE RELIEF VALVE
1. Clean relief valve, spring and housing.

NOTE: Lubricate relief valve with clean engine oil before installing.

2. Install relief valve and spring into housing (chain case cover) (Fig. 96).
3. Install new retainer cap until flush with sealing surface.