939003468 - 1060F INJECTORS AND PIPES

DESCRIPTION OF COMPONENTS

INJECTORS

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

The injector may be divided into two sections:

  • actuator/nebuliser consisting of pressure rod (1), pin (2) and nozzle (3);
  • control solenoid consisting of coil (4) and pilot valve (5).
Injector operation is divided into three stages.REST POSTION, the coil (4) is deactivated and the shutter (6) is in the closed position to prevent fuel from being introduced into the cylinder Fc > Fa (Fc: due to line pressure acting on control area 7 of rod 1; Fa: due to line pressure acting on feed volume 8).START OF INJECTION, the coil (4) is energized and causes the shutter (6) to rise.Control volume fuel (9) flows out towards return manifold (10) to bring about a pressure drop on control area (7). Simultaneously, the line pressure flowing through the intake duct (12) exercises a force Fa > Fc in the supply volume (8) to cause the pin (2) to lift and allow fuel into the cylinders.END OF INJECTION, the coil (4) is deactivated and causes the shutter (6) to return to closed position. This rebalances the forces so that the pin (2) returns to the closed position and the injection ends.
1 - Pressure rod2 - Pin3 - Nozzle4 - Coil5 - Pilot valve6 - Spherical shutter7 - Control area8 - Supply volume9 - Control volume10 - Fuel return - low pressure11 - Control duct12 - Supply duct13 - Electrical connection14 - Fuel return connector - high pressure15 - Spring

SINGLE FUEL MANIFOLD PIPE

The single fuel manifold (rail) is fited to the intake side of the cylinder head.

With a volume of around 33 cm³, this damps fuel pressure fluctuations due to:

  • pressure pump operation
  • injector opening.
The fuel pressure sensor and the second fuel pressure regulator are fitted on the supply manifold..The hydraulic connections (high pressure) between manifold-pump and manifold-injecors are via steel pipes with a bore of 2 mm and external diameter of 6 mm.
1. Single fuel manifold pipe (rail)2. Fuel pressure regulator3. Fuel pressure sensor