Engines Iveco C87 / Cursor 87. Manual — part 8
Figure 8
Operating principle
72597
1. Fuel outlet fitting to rail - 2. Delivery valve to rail - 3. Pumping element - 4. Pump shaft - 5. Pumping element supply duct -
6. Pressure regulator supply duct - 7. Pressure regulator
Sec. D — D
Pumping element (3) is oriented to pump shaft (4) cam.
During intake, the pumping element is supplied through
supply duct (5). The fuel amount to be sent to the pumping
element is set by the pressure regulator (7). The pressure
regulator meters fuel flow to pumping element according to
the PWM signal received from ECU. During pumping
element compression stage, fuel reaches the pressure
required to open the delivery valve to common rail (2) and
to feed it through outlet (1).
Sec. B — B
8
SECTION 1 - GENERAL SPECIFICATIONS
F2C CURSOR ENGINES
Base - June 2007
Figure 9
72601
1. Pumping element inlet - 2. Pump lubrication ducts -
3. Pumping element inlet - 4. Main pumping element
supply duct - 5. Pressure regulator - 6. Pumping element
inlet - 7. Regulator exhaust duct - 8. 5 bar pressure relief
valve - 9. Fuel drain from regulator inlet
Sec. C — C
72598
Figure 9 shows low pressure fuel paths inside the path and
highlights: main pumping element supply duct (4), pumping
element supply ducts (1 — 3 — 6), pump lubrication ducts (2),
pressure regulator (5), 5 bar pressure relief valve (8) and fuel
drain duct (7).
Pump shaft is lubricated by fuel through delivery and return
ducts (2).
Pressure regulator (5) establishes the fuel amount to send to
pumping elements; excess fuel is drained out through duct
(9).
5 bar pressure relief valve acts as fuel exhaust manifold and
keeps 5 bar constant pressure at regulator inlet.
Figure 10
Sec. A — A
1. Fuel outlet duct - 2. Fuel outlet duct - 3. Fuel outlet
from pump with high pressure pipe fitting for common rail
Figure 10 shows high pressure fuel flow through pumping
element outlet ducts.
SECTION 1 - GENERAL SPECIFICATIONS
9
F2C CURSOR ENGINES
114254
Figure 11
Operation
The cylinder is filled through the cap intake valve only if the
supply pressure is suitable to open the delivery valves set on
the pumping elements (about 2 bars).
The amount of fuel supplying the high-pressure pump is
metered by the pressure regulator, placed on the
low-pressure system; the pressure regulator is controlled by
the EDC7 control unit through a PWM signal.
When fuel is sent to a pumping element, the related piston
is moving downwards (suction stroke). When the piston
stroke is reversed, the intake valve closes and the remaining
fuel in the pumping element chamber, not being able to come
out, is compressed above the supply pressure value existing
in the rail.
The thereby-generated pressure makes the exhaust valve
open and the compressed fuel reaches the high-pressure
circuit.
The pumping element compresses the fuel till the top dead
center (delivery stroke) is reached. Afterwards, the pressure
decreases till the exhaust valve is closed.
The pumping element piston goes back towards the bottom
dead center and the remaining fuel is decompressed.
When the pumping element chamber pressure becomes less
than the supply pressure, the intake valve is again opened and
the cycle is repeated.
The delivery valves must always be free in their movements,
free from impurities and oxidation.
The rail delivery pressure is modulated by the electronic
control unit, through the pressure regulator solenoid valve.
The pump is lubricated and cooled by the fuel.
The radialjet pump disconnection — reconnection time on
the engine is highly reduced in comparison with traditional
injection pumps, because it does not require setting.
If the pipe between fuel filter and high-pressure pump is to
be removed-refitted, be sure that hands and components are
absolutely clean.
1. Rail - 2. Fuel return - 3.Pipelines to injectors - 4. Fuel
supply to high pressure pump - 5. Pressure sensor -
6. Overpressure valve
The rail volume is of reduced sizes to allow a quick
pressurisation at startup, at idle and in case of high flow-rates.
It anyway has enough volume as to minimise use of plenum
chambers caused by injectors openings and closings and by
the high-pressure pump operation. This function is further
enabled by a calibrated hole being set downstream of the
high-pressure pump.
A fuel pressure sensor (5) is screwed to the rail. The signal
sent by this sensor to the electronic control unit is a
feed-back information, depending on which the rail pressure
value is checked and, if necessary, corrected.
Electroinjector
RAIL (PRESSURE ACCUMULATOR)
114255
Figure 12
1. Fuel return hole - 2. Fuel supply
10
SECTION 1 - GENERAL SPECIFICATIONS
F2C CURSOR ENGINES
Base - June 2007
SECTION 3 - INDUSTRIAL APPLICATION
1
F2C CURSOR ENGINES
SECTION 3
Industrial application
Page
CLEARANCE DATA
3
. . . . . . . . . . . . . . . . . . . . .
PART ONE -
MECHANICAL COMPONENTS
5
. . . . . . . . .
ENGINE DISASSEMBLY ON BENCH
7
. . . . . . . .
ASSEMBLY
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- High pressure pump installation
15
. . . . . . . . . . .
ENGINE FLYWHEEL
15
. . . . . . . . . . . . . . . . . . . . .
- Engine flywheel installation
15
. . . . . . . . . . . . . . .
- Camshaft installation
16
. . . . . . . . . . . . . . . . . . . .
TIMING CAMSHAFT AND FLYWHEEL USING
TOOL 99395223
17
. . . . . . . . . . . . . . . . . . . . . .
- Timing camshaft
17
. . . . . . . . . . . . . . . . . . . . . . .
- Timing flywheel
19
. . . . . . . . . . . . . . . . . . . . . . . .
TIMING CAMSHAFT AND FLYWHEEL WITHOUT
TOOL 99395223
19
. . . . . . . . . . . . . . . . . . . . . .
- Timing camshaft
19
. . . . . . . . . . . . . . . . . . . . . . .
- Timing flywheel
22
. . . . . . . . . . . . . . . . . . . . . . . .
- Intake and exhaust rocker arm clearance
adjustment
23
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE ASSEMBLY COMPLETION
24
. . . . . . . . .
PART TWO -
ELECTRICAL EQUIPMENT
27
. . . . . . . . . . . . .
- Components on the engine F2C
29
. . . . . . . . . . .
- Engine cable
30
. . . . . . . . . . . . . . . . . . . . . . . . . .
- EDC 7 UC31 control unit pin-out
31
. . . . . . . . .
- EDC 7 UC31 electronic control unit
32
. . . . . . .
- EDC control unit PIN-OUT
33
. . . . . . . . . . . . . .
- Electroinjectors
35
. . . . . . . . . . . . . . . . . . . . . . . .
- Engine coolant temperature sensor
36
. . . . . . . .
- Fuel temperature sensor
37
. . . . . . . . . . . . . . . . .
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