Engine Iveco C10/C13/C78/Cursor 13/Cursor 78. Instruction - page 44

0 411 700 002

XXXXXX XXXX X

868 USA /

1. Fuel valve - 2. Pumping element - 3. Fuel outlet -

4. Filling and backflow passage.

87060

60669

Figure 7

For each replaced injector you shall connect with the
diagnosis device and when it is required by the program you
shall insert the printed code on the injector (

)

to program

the gearcase again.

Injector Phases

When checking the clearance of the rocker arms,
it is important to check the injector-pump
pre-load.

Filling phase
During the filling phase the pumping element (2) runs up to
the top position.
After passing the highest point of the cam, the rocker arm
roller comes near the base ring of the cam.
The fuel valve (1) is open and fuel can flow into the injector
via the bottom passage (4) of the cylinder head.
Filling continues until the pumping element reaches its top
limit.

Figure 8

NOTE

A specific fault-diagnosis program, included in the control
unit, is able to check the operation of each injector (it
deactivates one at a time and checks the delivery of the other
five).
Fault diagnosis makes it possible to distinguish errors of an
electrical origin from ones of a mechanical/hydraulic origin.
It indicates broken pump-injectors.
It is therefore necessary to interpret all the control unit error
messages correctly.
Any defects in the injectors are to be resolved by replacing
them.

Solenoid valve
The solenoid, which is energized at each active phase of the
cycle, via a signal from the control unit, controls a slide valve
that shuts off the pumping element delivery pipe.
When the solenoid is not energized, the valve is open, the
fuel is pumped but it flows back into the return pipe with the
normal transfer pressure of approximately 5 bars.
When the solenoid is energized, the valve shuts and the fuel,
not being able to flow back into the return pipe, is pumped
into the nozzle at high pressure, causing the needle to lift.
The amount of fuel injected depends on the length of time
the slide valve is closed and therefore on the time for which
the solenoid is energized.
The solenoid valve is joined to the injector body and cannot
be removed.
On the top there are two screws securing the electrical
wiring from the control unit.
To ensure signal transmission, tighten the screws with a torque
wrench to a torque of 1.36 — 1.92 Nm (0.136 — 0.192 kgm).

6

SECTION 2 - FUEL

Injection phase
The injection phase begins when, at a certain point in the
down phase of the pumping element, the solenoid valve gets
energized and the fuel valve (1) shuts.

The moment delivery begins, appropriately calculated by the
electronic control unit, depends on the working conditions
of the engine.

The cam continues with the rocker arm to push the pumping
element (2) and the injection phase continues as long as the
fuel valve (1) stays shut.

1. Fuel valve - 2. Pumping element - 3. Fuel outlet -

4. Filling and backflow passage.

1. Fuel valve - 2. Pumping element - 3. Fuel outlet -

4. Filling and backflow passage.

60670

Figure 9

60671

Figure 10

Pressure Reduction phase
Injection ceases when the fuel valve (1) opens, at a certain
point in the down stroke of the pumping element, after the
solenoid valve gets de-energized.

The fuel flows back through the open valve (1), the injector
holes and the passage (4) into the cylinder head.

The time for which the solenoid valve stays energized,
appropriately calculated by the electronic control unit, is the
duration of injection (delivery) and it depends on the working
conditions of the engine.

SECTION 2 - FUEL

7

8

SECTION 2 - FUEL

SECTION 3 - INDUSTRIAL APPLICATION

1

SECTION 3

Industrial application

Page

CLEARANCE DATA

3

. . . . . . . . . . . . . . . . . . . . .

PART ONE -

MECHANICAL COMPONENTS

5

. . . . . . . . .

ENGINE ASSEMBLY DISASSEMBLY

7

. . . . . . . . .

ENGINE ASSEMBLY

14

. . . . . . . . . . . . . . . . . . . . . .

ENGINE FLYWHEEL

16

. . . . . . . . . . . . . . . . . . . . .

- Fitting engine flywheel

16

. . . . . . . . . . . . . . . . . . .

- Fitting camshaft

17

. . . . . . . . . . . . . . . . . . . . . . . .

- Fitting pump-injectors

18

. . . . . . . . . . . . . . . . . . .

- Fitting rocker-arm shaft assembly

18

. . . . . . . . . .

- Camshaft timing

19

. . . . . . . . . . . . . . . . . . . . . . .

- Phonic wheel timing

21

. . . . . . . . . . . . . . . . . . . .

- Intake and exhaust rocker play adjustment and

pre-loading of rockers controlling pump injectors

22

ENGINE COMPLETION

24

. . . . . . . . . . . . . . . . . .

PART TWO -

ELECTRICAL EQUIPMENT

29

. . . . . . . . . . . . .

- Components on the engine F3A

31

. . . . . . . . . . .

BLOCK DIAGRAM

32

. . . . . . . . . . . . . . . . . . . . . . .

- EDC MS 6.2 electronic control unit

33

. . . . . . . .

- EDC control unit PIN-OUT

34

. . . . . . . . . . . . . .

- Connector “A” (Engine)

34

. . . . . . . . . . . . . . . . .

- EDC control unit PIN-OUT

35

. . . . . . . . . . . . . .

- Connector “B” (Frame area)

35

. . . . . . . . . . . . . .

- Engine coolant temperature sensor

37

. . . . . . . .

- Fuel temperature sensor

38

. . . . . . . . . . . . . . . . .

- Flywheel pulse transmitter

39

. . . . . . . . . . . . . . . .

- Distribution pulse transmitter

40

. . . . . . . . . . . . .

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