Pressure pump

PRESSURE PUMP

The pressure pump is radialjet type with three radial pistons (total capacity 0.657 cc). It is controlled by a timing belt with or without timing requirements.

Each pump unit consists of:

• a piston (5) opered by a cam (2) integral with the pump shaft (6);
• a plate-type intake valve (3);
• a delivery ball valve (4).

The pressure pump must be supplied at a pressure of at least 0.5 bars; and for this reason the fuel system is equipped with an auxiliary pump submerged in the tank.

The pressure pump is lubricated and cooled by the diesel fuel via channels and is able to deliver a maximum pressure of 1350 bars.

1. Cylinder
2. Cam
3. Plate-type intake valve
4. Ball-type delivery valve
5. Piston
6. Pump shaft
7. Diesel intake connection - low pressure - from fuel filter
8. Diesel delivery connection - high pressure - to manifold (rail)
9. Diesel delivery connection - low pressure - recirculation

PRESSURE REGULATOR SENSOR

The fuel pressure regulator is fitted to the pressure pump and controlled directly by the injection control unit. It regulates fuel feed pressure to the injectors.

The pressure regulator consists mainly of the following parts:

1. Ball plunger
2. Pin
3. Valve
4. Preload spring
5. Coil
6. Body
7. Anchor