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| Illustration 1 | g00347599 |
Operation of the fuel injector (1) Rocker arm (2) Screw (3) Pushrod (4) Lifter assembly (5) Camshaft (6) Fuel injector clamp (7) Fuel injector (8) Rack | |
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| Illustration 2 | g00313984 |
Fuel Injector (7) Fuel injector (9) Gear (10) Plunger | |
The fuel injector (7) is held in position in the cylinder head by the fuel injector clamp (6). Fuel is injected into the combustion chamber when the rocker arm (1) pushes the top of the fuel injector downward. The movement of the rocker arm is controlled by the camshaft (5) through the lifter assembly (4) and the pushrod (3) .
The amount of fuel that is injected is controlled by the rack (8). Movement of the rack causes rotation of the gear (9) which is fastened to the plunger (10). Rotation of the plunger changes the effective stroke of the plunger. The plunger's effective stroke is the part of the stroke that is actually injecting fuel.
Injection timing is dependent on two factors:
- Angular location of the camshaft (5)
- Location of the plunger (10)
The angular location of the camshaft is controlled by the camshaft drive gears at the rear of the engine. The location of the plunger can be adjusted with the screw (2).