3232878 - 1060F injectors and lines

Injectors

They are fitted on the cylinder head and operated by the injection control unit.

The injectors can be divided into two sections:

  • actuator/nozzle consisting of a pressure rod (1), pin (2) and jet (3)
  • solenoid valve consisting of a coil (4) and valve (5).

Operation

The operation of the injector can be divided into three stages:

  • rest position
The coil (4) is de-energized and the shutter (6) is in the closed position and does not allow the introduction of fuel into cylinder Fc > Fa (Fc: due to the line pressure acting on control area 7 of the rod 1; Fa: due to the line pressure acting in supply volume (8)."start of injection"The coil (4) is energized and causes the shutter (6) to be raised.The control volume (9) fuel flows towards the return manifold (10) causing a decrease in pressure in the control area (7).At the same time, the line pressure exerts a force Fa > Fc in the supply volume (8), via the supply duct (12), causing the raising of the pin (2) with the consequent introduction of fuel into the cylinders."end of injection"The coil (4) is de-energized and returns the shutter (6) to the closed position which recreates an equilibrium with forces which return the pin (2) to the closed position and consequently end the injection.
1, Pressure rod 2, Pin 3, Jet 4, Coil 5, Pilot Valve 6, Spherical shutter 7, Control area 8, Supply volume 9, Control volume 10, Fuel return - low pressure 11, Control duct 12, Supply duct 13, Electrical connection 14, Fuel inlet connector - high pressure 15, Spring

Supply manifold (Rail)

The supply manifold is fitted on the inlet side cylinder head.

With its volume of around 33 cc it dampens the fuel pressure oscillations due to:

  • the operation of the pressure pump
  • the opening of the injectors.
The fuel pressure sensor (see 1060G) is fitted at the centre of the supply manifold.The (high pressure) hydraulic connections between the manifold-pump and manifold-injectors are made by means of steel pipes with an internal diameter of 2 mm and an external diameter of 6 mm.