The fuel injector combines in a single unit all of the parts necessary to provide complete and independent fuel injection at
each cylinder. The injector creates the high pressure necessary for fuel injection, meters the proper amount of fuel,
atomizes the fuel and times the injection into the combustion chamber.
Since the injector is one of the most important and carefully constructed parts of the engine, it is recommended that the
engine operator replace the injector as an assembly if it is not operating properly. Authorized Detroit Diesel Allison Service
Outlets are properly equipped to service injectors.
Figure 7-8. Removing Injector from Cylinder Head
An injector may be removed in the following manner:
1. Clean and remove the valve rocker cover.
2. Disconnect the fuel pipes from both the injector and the fuel connectors.
3. Immediately after removing the fuel pipes, cover the injector inlet and outlet fittings with shipping caps to prevent
dirt from entering.