Perkins 1300 EDi Series, Workshop Manual, Page: 175 / 264

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Workshop Manual, TPD 1353E, Issue 3 163
Peregrine EDi and 1300 Series EDi
Phase 2: End-of-injection
The engine control module de-energises the solenoid to start the end-of-injection.
When the solenoid is de-energised, the pressure of the spring (C4) moves the valve up, this closes the oil inlet
port (C5), and opens the oil outlet port (C3). The oil chamber is now closed to oil at injection control pressure
and the oil pressure in the chamber is allowed to discharge through the outlet port into the rocker cover.
When the pressure in the oil chamber is less than the total pressure of the spring (C6) and the fuel in the fuel
chamber, the piston moves up into the oil chamber.
When the piston moves up, the pressure of the fuel in the fuel chamber reduces rapidly. This causes the flat
valve to close. As the piston continues to move up, the fuel pressure above the flat-valve becomes less than
the fuel pressure below it and the valve is kept closed.
The initial rapid reduction of pressure in the fuel chamber allows the spring (D1) to close the nozzle needle. As
soon as the nozzle needle closes it fills more space in the nozzle, which causes the pressure below the flat
valve to increase rapidly. This opens the nozzle needle again and a small amount of fuel is injected, then the
pressure reduces again and the nozzle needle closes. Fuel injection ends.
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C
PW241
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PW242
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