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.
15
14
SECTION 2 - FUEL
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB
Electro-injector
The injectors fitted on the NEF TIER 3 engines are the CRIN 2 - BOSCH versions. Depending on the power developed by the
engine (more than or less than 152 kW) different nozzles (1) are fitted (DLLA or DSLA).
Figure 16
108610
1. Jet.
SECTION 2 - FUEL
15
F4HE NEF ENGINES
Print P2D32N003GB
Base - February 2006
Jet
Powers
Pressures
DLLA
Up to 152 kW
250
÷ 1600 bar
DSLA
Lower to 152 kW
250
÷ 1450 bar
PRESSURE LIMITER FOR FUEL RETURN
It is housed on the rear of the cylinder head, and adjusts the
pressure of fuel returning from injectors at a pressure 1.3 and
2 bars. By guaranteeing this pressure to the return fuel, the
fuel vapours formation inside injectors is avoided, optimising
fuel spraying and combustion.
70507
Figure 17
A
To tank — B From injectors
16
SECTION 2 - FUEL
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB
SECTION 3 - DUTY-INDUSTRIAL APPLICATION
1
F4HE NEF ENGINES
Print P2D32N003GB
Base - February 2006
SECTION 3
Duty-industrial application
Page
GENERAL SPECIFICATIONS
3
. . . . . . . . . . . . . . .
- Section pictures of complete engine -
common rail version
3
. . . . . . . . . . . . . . . . . . . .
- Clearance data - 4 cyl.
4
. . . . . . . . . . . . . . . . . . .
- Clearance data - 6 cyl.
5
. . . . . . . . . . . . . . . . . . .
PART ONE -
MECHANICAL COMPONENTS
7
. . . . . . . . .
ENGINE OVERHAUL
9
. . . . . . . . . . . . . . . . . . . . .
- Preface
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- Engine setting operations for the assembly
on turning stand
9
. . . . . . . . . . . . . . . . . . . . . . .
- Disassembly of application components
10
. . . . .
- Assembly of application components
17
. . . . . . .
- Completion of the engine
29
. . . . . . . . . . . . . . . .
- Checks and inspections
30
. . . . . . . . . . . . . . . . . .
PART TWO -
ELECTRICAL EQUIPMENT
31
. . . . . . . . . . . . .
LOCATION OF THE MAIN ELECTRICAL
COMPONENTS
33
. . . . . . . . . . . . . . . . . . . . . . .
- EDC7 ECU
34
. . . . . . . . . . . . . . . . . . . . . . . . . . .
- Cable on engine
35
. . . . . . . . . . . . . . . . . . . . . . .
- Injectors connector (A)
36
. . . . . . . . . . . . . . . . . .
- Sensors connector (C)
36
. . . . . . . . . . . . . . . . . .
- Crankshaft sensor
37
. . . . . . . . . . . . . . . . . . . . . .
- Timing sensor
37
. . . . . . . . . . . . . . . . . . . . . . . . .
- Supercharging air pressure - temperature sensor
38
- Engine oil temperature-pressure sensor
38
. . . . .
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