High pressure supply valves

High pressure supply valves

1. Washer
2. Valve body
3. Washer
4. Supply valve
5. Spring
6. Spring guide
7. High pressure outlet connector

The supply valves are enclosed between the high pressure outlet connectors (7) and the head stator.

The seal between the valve casing, the head and the connector is achieved by means of two steel washers (1 and 3).

The assembly consists of a valve body (2) and a valve (4) matched together.

The maximum movement of the supply valve is restricted by the spring guide (6).

The spring (5) thrusts the valve (4) against the valve body (2), keeping it in its seat.

At the end of the injection cycle, the supply valves "recall" a certain amount of fuel from the high pressure pipes to ensure the rapid closing of the nozzles and, combined with the cam seal profile, the maintenance of the residual pressure in these high pressure pipes.

Cut out solenoid

1. Passage for transfer pressure
2. Piston
3. Solenoid assembly
4. Passage of fuel towards the metering valve

The engine can be made to cut out by completely removing the supply.

This is achieved by means of a solenoid valve (3) bolted onto the hydraulic head which operates between the flow of transfer pressure (1) and the flow of the metering valve (4).

The cut out solenoid, also known as the Electrostop, is directly connected to the Fiat CODE system and for this reason it is suitably protected by an anti-tamper cover.