Engines Iveco N45, N67. Manual - part 8
15
70505
70506
Figure 14
Figure 15
ELECTRO-INJECTOR
The injector is similar as construction to the traditional ones,
apart from the absence of plunger return springs.
The injector can be deemed as composed of two parts:
- actuator — spray nozzle composed of pressure rod (1),
plunger (2) and nozzle (3);
- control solenoid valve composed of coil (4) and pilot
valve (5).
The solenoid valve controls spray nozzle plunger lift.
Injector in rest position
1. Pressure rod — 2. Plunger — 3. Nozzle — 4. Coil — 5. Pilot
valve — 6. Ball shutter — 7. Control area — 8. Pressure
chamber — 9. Control volume — 10. Control duct —
11. Supply duct — 12. Control fuel outlet — 13. Electric
connection — 14. Spring — 15. High-pressure fuel inlet.
When coil (4) is energised, it makes shutter (6) move
upwards. The control volume (9) fuel flows towards flow
duct (12) making a pressure drop occur in control volume
(9). Simultaneously the fuel pressure into pressure chamber
(8) makes plunger (2) lift, with following fuel injection into the
cylinder.
Injection end
When coil (4) is de-energised, shutter (6) goes back to its
closing position, in order to re-create such a force balance as
to make plunger (2) go back to its closing position and end
the injection.
Injection start
!
The injector cannot be overhauled and therefore it
must not be disassembled.
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14
SECTION 2 - FUEL
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB