DAF LF45, LF55 Series. Manual — part 280
©
200416
3-1
CE Engine fuel system
TECHNICAL DATA
ΛΦ45/55 series
4
0
3. CE ENGINE FUEL SYSTEM
3.1 GENERAL
Fuel level element
Fuel fine filter
Lift pump
High-pressure pump
Fuel rail
Fuel rail pressure-limiting valve
Injector
Injector washer
Angular displacement
70
Maximum pressure drop across fuel fine filter
2.0 bar
Fuel lift pump pressure in front of fine filter (with
engine at idling speed)
5 - 13 bar
Fuel lift pump pressure behind fine filter (with en-
gine at idling speed)
3 - 11 bar
Pressure relief valve opening pressure
11 bar
Maximum underpressure on suction side of fuel
lift pump
0.5 bar
Pump pressure (dependent on the operating
mode of the engine and the electronic calibration)
300 - 1400 bar
Fuel rail pressure (dependent on the operating
mode of the engine and the electronic calibration)
300 - 1400 bar
Opening pressure
1650 bar
Number of holes in injector
8
Resistance of magnet coil
0,15 - 0,5
i400693
A
Nozzle length
(distance A)
Washer thickness
21.5
≥ 0.2 mm
1.5 mm
23.0
≥ 0.2 mm
3.0 mm
TECHNICAL DATA
3-2
©
200416
CE Engine fuel system
0
ΛΦ45/55 series
4
Fuel return overflow valve
Fuel return pipe
Return fuel measurement
Fuel return overflow valve opening pressure
1.2 - 2.0 bar
Maximum return pipe pressure build-up
0.2 bar
Maximum quantity of return fuel at idling speed
180 ml/min.
Time for filling a measuring beaker to a volume of
360 ml
> 2 min.
©
200416
3-3
CE Engine fuel system
TECHNICAL DATA
ΛΦ45/55 series
4
0
3.2 TIGHTENING TORQUES
The tightening torques specified in this section
are different from the standard tightening torques
cited in the overview of the standard tightening
torques. The other threaded connections not
specified must therefore be tightened to the
torque cited in the overview of standard
tightening torques.
When attachment bolts and nuts are replaced, it
is important that - unless stated otherwise - these
bolts and nuts are of exactly the same length and
property class as those removed.
Electronic unit cooling plate
Low-pressure fuel pipes
High-pressure pump
High-pressure fuel pipe
Fuel rail
Injector pipes
Fuel supply pipe
Injectors
Attachment bolts holding the electronic unit to the
cooling plate
10 Nm
Attachment bolts holding the cooling plate to the
engine block
24 Nm
VOSS quick-release coupling fittings
18 Nm
Banjo bolts
24 Nm
VOSS quick-release coupling fittings
24 Nm
Fuel return overflow valve in cylinder head
24 Nm
Attachment nuts holding the high-pressure pump
to the timing gear case
25 Nm
High-pressure pipe union nut
22 Nm
Attachment bolts
24 Nm
Pressure-limiting valve
100 Nm
Injector pipe union nuts
22 Nm
Fuel supply pipe nut
50 Nm
Injector clamping bracket attachment bolts
10 Nm
Injector electrical connection
1.5 Nm
TECHNICAL DATA
3-4
©
200416
CE Engine fuel system
0
ΛΦ45/55 series
4
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