Section 03-04D: Fuel Charging and Controls, 7.3L Diesel Engine | 1996 F-250, F-350 and F-Super Duty Workshop Manual |
Two similar electronically controlled/hydraulically actuated fuel injectors are used. They both are comprised of the following:
When the fuel injector is energized, a poppet valve is opened by an electronic solenoid mounted on the fuel injector. High-pressure oil from the high-pressure oil pump flows into the fuel injector and acts on the amplifier piston, forcing the piston plunger downward. As the plunger moves down, the increased fuel pressure closes the fuel inlet check ball. Rising fuel pressure overcomes spring pressure and opens the nozzle check valve. Fuel is then injected into the combustion chamber through the eight spray orifices in the nozzle tip at pressures as high as 124,110 kPa (18,000 psi). When the fuel injector is de-energized, high-pressure oil on top of the amplifier piston is vented by the poppet valve through the top portion of the fuel injector to the oil pan.
| Item | Part Number | Description |
|---|---|---|
| 1 | — | Solenoid (Part of 9E527) |
| 2 | — | Armature (Part of 9E527) |
| 3 | — | Poppet Valve (Part of 9E527) |
| 4 | — | Oil Inlet Port (Part of 9E527) |
| 5 | — | Amplifier Piston (Part of 9E527) |
| 6 | — | Plunger (Part of 9E527) |
| 7 | — | Nozzle Check Valve (Part of 9E527) |
| 8 | — | Nozzle Tip (Part of 9E527) |
| 9 | — | Fuel Inlet Check Ball (Part of 9E527) |
| 10 | — | Fuel Inlet Port (Part of 9E527) |
| 11 | — | Spill Control Port (California Only) (Part of 9E527) |