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:
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.
