Fuel pressure regulator

1. Slacken the fastening nuts and remove the pressure pump.

26 ÷ 32 Nm
2.7 ÷ 3.3 kgm

Reassemble, reversing the sequence followed for removal and following the instructions given below.

1. Tighten the nut fastening the pressure pump control pulley to the specified torque using wrench no. 1.822.138.000.

43 ÷ 53 Nm (*)
4.4 ÷ 5.4 kgm

(*): Nominal value

FUEL PRESSURE REGULATOR

This is fitted on the pressure pump and controlled by the injection control unit. It adjusts the pressure of the fuel supply to the injectors.

The pressure regulator mainly comprises:

• a ball shutter (1)
• a pin (2) for controlling valve (3)
• a pre-loading spring (4)
• a coil (5).

1. Ball shutter
2. Pin
3. Valve
4. Pre-loading spring
5. Coil
6. Body
7. Anchor

INJECTORS

These are fitted on the cylinder head and controlled by the injection control unit.

The injector can be subdivided into two parts:

• actuator/atomiser composed of a pressure rod (1), pin (2) and nozzle (3)
• solenoid control valve composed of a coil (4) and drive valve (5).