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).
Ima classification
During the test stage the injectors are checked with the specifications verified in different pressure/flow rate conditions. All the injectors that do not meet a certain standard are rejected; the remaining ones are classified using a 9 character alphanumerical code, known as an IMA code, imprinted by laser on the top part of the magnet.During fitting on the vehicle the control unit should memorize the individual code and, if one or more injectors is replaced in a service situation the alteration to the code should be made during the diagnosis using the appropriate equipment.1 - Pressure rod2 - Pin3 - Jet (6)4 - 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.