184000277 - 1060F INJECTORS AND LINES
COMPONENT DESCRIPTION
INJECTORS
Construction features
The injectors 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 pilot valve (5).
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.Ima classification
During the test stage the injector specifications are checked in different pressure/flow rate conditions. Any injectors that do not meet a certain standard are discarded; the remaining ones are classified using an alphanumerical code with nine digits known as an IMA code etched by laser on the top part of the magnet.When fitted in the vehicle the control unit must memorize the individual code and if one or more of the injectors is replaced in a service situation the different code must be entered during diagnosis using the diagnostic equipment.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 inlet connector - high pressure15. Spring16. IMA code
