Pressure pump

PRESSURE PUMP

This is of the "radial jet" with three radial pistons (total displacement 0.657 c.c.) and it is controlled by the timing gear belt with no need for timing. Each pumping unit comprises:

• a piston (5) operated by a cam (2) integral with the spindle of the pump (6)
• a plate inlet valve (3)
• a ball delivery valve (4).

1. Cylinder
2. Cam
3. Plate inlet valve
4. Ball delivery valve
5. Piston
6. Pump spindle
7. Inlet - low pressure
8. Delivery - high pressure
9. Delivery - low pressure (re-circulation)

The pressure pump must be supplied with a pressure of at least 0.5 bar; therefore the fuel system is fitted with an auxiliary electric pump submerged in the fuel tank. The maximum delivery pressure reaches 1350 bar. The pressure pump is lubricated and cooled by the actual fuel oil through suitable grooves.

REMOVAL/REFITTING

• Set the car on a lift.
• Make sure that the ignition key is at the "STOP" position, then disconnect the battery terminal (-).

1. Remove the engine oil filler cap.
2. Slacken the fastening screws and remove the engine cover.
3. Refit the engine oil filler cap.

1. Slacken the fastening screws and remove the power unit reaction rod.