Pre-Injection-continued

TM 9-2320-312-24-2

Systems Operation Section

All of the internal components have been returned to

the spring loaded position during the pre-injection.

The solenoid is not energized and the lower poppet

seat (2) is closed. When the lower poppet seat is

closed, the lower poppet seat blocks high pressure

actuation oil from entering the unit injector. The

plunger and the intensifier piston are at the top

of the bore and the plunger cavity is full of fuel.

Fuel pressure in the plunger cavity is equal to the

fuel supply pressure. The fuel supply pressure is

approximately 450 kPa (65 psi).