Disassembly and Assembly

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 Components for removal procedure.

DISASSEMBLY
1. To remove the relief valve, proceed as follows:
2. Drill a 3.175 mm (1/8 inch) hole into the relief valve retainer cap and insert a self-threading sheet metal screw into cap.

Oil Pressure Relief Valve:

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.
4. Remove oil pump cover screws, and lift off cover.
5. Remove pump rotors.

Oil Pump:

6. Wash all parts in a suitable solvent and inspect carefully for damage or wear.

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