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Design and Components

The unit injector is installed in the cylinder head, as shown in figure 9-24. It is held in place by an injector clamp. The cylinder head has a copper tube into which the in-jector fits snugly with the spray tip projecting slightly into the cylinder clearance space. Water circulates around the copper tube and cools the lower part of the injector. Two fuel lines are connected to each injector; one carries fuel to the injector and the other carries away the fuel that is bypassed. The injector is operated by a rocker arm and push rod assembly, which work off the camshaft. The amount of fuel injected is regulated by the control rack, which is operated by a lever secured

Figure 9-24.-Fuel injector mounting.







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