Iveco Daily Euro 4. Manual — part 77
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Figure 329
FUNCTIONAL DIAGRAM OF HYDRAULIC SYSTEM
1. High-pressure pump - 2. High-pressure delivery pipe - 3. Electric injector return pipe - 4. Electric injectors - 5. Common rail -
6. Fuel pressure sensor - 7. Filter with water separator - 8. Fuel electric pump non-return valve - 9. Injector return line
pressure-relief valve - 10. Tank - 11. Fuel electric pump - 12. Fuel electric pump intake filter - 13. Fuel electric pump
overpressure valve - 14. Pressure-relief valve - 15. Proportional pressure-relief valve
Relative pressures within the circuit:
a. 4,15 bar 5,35 bar
b. 3,5 bar 5,0 bar
c. p < 0,8 bar
d. 0,3 bar 0,8 bar
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Figure 330
HYDRAULIC SYSTEM
The hydraulic system is made up of the following items:
- tank;
- electronic fuel pump;
- fuel filter;
- high-pressure feed pump;
- pressure regulator;
- manifold (rail);
- electric injectors;
- low-pressure feed pipe assembly;
- high-pressure pipes.
FUEL ELECTRIC PUMP ASSEMBLY SECTION
1. Return - 2. Connector - 3. Delivery - 4. Float - 5. Level sensor (+) - 6. Level sensor (-) - 7. Pump (-) - 8. Pump (+) -
A. Return line - B. Delivery line - C. Level sensor - D. Prefilter - E. Jet pump
773010
Fuel pump
The fuel electric pump is of the volumetric, low-pressure type.
It is built into the fuel level indicator located in the fuel tank.
Electric connector (2), located in the upper portion of the assembly, features the pins both for the electric pump and the level
sensor. During the installation, the assembly shall not be stressed with axial loads of more than 67 N and torque of more than 3
Nm. The maximum fastening torque on the gasket shall be 60 Nm.
Figure 331
109073
109123
CHARACTERISTIC CURVES
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Figure 332
542011
”Filtrauto” fuel filter
The fuel filter consists of an internal filtering-paper cartridge
(15) and is equipped with a water separator.
The maximum water storage capacity of the filter is 150 cm3.
The water sensor detects the presence of water in the filter
starting from an existing volume of 70 cm3.
This sensor is located in the lower part of the filter.
The temperature, water and clogging (if any) sensors are inter-
faced with the electronic circuit (13) located inside in the
upper portion of the assembly.
When the diesel fuel temperature is lower than a limit value,
the electric resistor will come into operation by properly hea-
ting the diesel fuel before the latter is conveyed to the high-
pressure pump.
109072
1. Body - 2. Gasket - 3. Cover bottom - 4. Drain screw gasket - 5. Customer reference - 6. Diesel oil outlet - 7. Diesel oil inlet -
8. Air drain screw - 9. Supplier code - 10. Air bleeding or water draining screw - 11. Lower bottom - 12. Inner pipe -
13. Filtering paper - 14. Upper bottom - 15. Heating earth - 16. NTC1 - 17. NTC2 - 18. Clogging sensor (if foreseen) -
19. Water sensor - 20. Heating - 21. Feed - 22. GND
Clogging sensor (if any) features
- differential working pressure:
0.7
÷ 0.85 bar
Tightening torque
5. Cover
35
±5 Nm
12. Air/water drain screw
1
±0.2 Nm
NTC and heating features
- rated voltage
13.5 V
- max. permitted voltage
30 V
- rated output
250 W at 185 l/h, T = -10˚C
- temperature range
-30
÷120˚C
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Figure 333
542011
”UFIfilters” fuel filter
Fuel filter (4) is made up of a filtering cartridge with water
separator, inside which electronic unit (6) is housed.
Water accumulation capacity is equal to 140 cm3.
Electronic unit (6) includes water present sensor, (optional)
filter clogging sensor and temperature sensor.
Water present sensor
Water present sensor detects water present in the filter
starting from 110 cm
volume present. Water present
sensor provides values of:
- low voltage in presence of water;
- high voltage in absence of water.
Characteristics
12V nominal voltage (8V minimum -16V maximum)
Absorbed current:
- lower than 15 mA in rest conditions;
- lower than 150 mA in alarm conditions (including load).
Voltage on load:
- in rest conditions: higher than 11.8 V;
- in alarm conditions: lower than 3.9 V.
At key-on operation, the sensor makes a self-test issuing 2.5
second duration sound signal.
112723
(Optional) filter clogging sensor
Normally open contact type.
Operation differential pressure delta p:
0.8 bar
NTC temperature sensor
-30 ˚C = 26.114 ohm
± 9,7%
0 ˚C =
5.896 ohm
± 7,3%
+25 ˚C =
2.057 ohm
± 5,6%
+60 ˚C =
596 ohm
± 3,8%
+100 ˚C =
186 ohm
± 2,0%
+110 ˚C =
144 ohm
± 2,4%
Temperature range: -40˚C to +130˚C
Heater
Nominal voltage
12 V
Maximum allowed voltage
30 V
Nominal power
250 W
Tightening torques
9.
Screw securing filter
1.5 + 0.5 Nm
4.
Water draining or air bleeding screw
1.5 + 0.5 Nm
+0,05
-0,5
1. Fuel filter support- 2. Diesel oil outlet - 3. Diesel oil inlet - 4. Diesel oil filter - 5. Drain screw - 6. Electronic unit - 7. Fastener
- 8. 12-way connector - 9. Screw securing Diesel oil filter: H-G-B, water present sensor; - H-C, clogging sensor (if foreseen); -
D-E, NTC temperature sensor; - F-A, heater.
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