Engines Iveco C10,C13, Cursor 10, Cursor 13. Manual

EARLY CLOSING SYSTEM FOR THE INTAKE VALVES (”MILLER” CYCLE) -
(FOR TYPES F3BE0684H*E901 - F3BE9687A*E001 - F3BE9687B*E001 - F3BE9687C*E001)

The ”Miller” system is used to reduce the maximum combustion temperature in the cylinder, which is responsible for producing
nitrogen oxides (NOx).
The concentration of oxygen in the combustion chamber is reduced by closing the intake valves slightly before the end of the
intake stroke of the cylinder, (see detail C).

Figure 32

104762

1. Exhaust cams - 2. Intake cams - 3. EGR lobe - S. Exhaust pipes - A. Intake pipes.

B = End of standard intake stroke

C = End of intake stroke with ”Miller cycle” device

SECTION 1 - GENERAL SPECIFICATIONS

F3B CURSOR ENGINES

Base - May 2007

Figure 1

1. Valve for return circuit, starts opening at 3.5 bars - 2. Valve for return circuit, starts opening at 0.2 bars.

104280

FEEDING

Fuel is supplied via a fuel pump, filter and pre-filter, 6
pump-injectors governed by the camshaft via rocker arms
and by the electronic control unit.

Return circuit

Supply circuit

SECTION 2 - FUEL

F3B CURSOR ENGINES

104242

Figure 2

1. Temperature sensor - 2. Bleed valve - 3. Secondary fuel filter - 4. By-pass valve (0.3

÷ 0.4 bar) - 5. Fuel supply pump -

6. Integrated valve (3.5 bar) - 7. Pressure relief valve (5 bar) - 8. Fuel tank - 9. Priming pump - 10. Primary fuel filter -

11. Check valve (opening 0.1 bar) - 12. Heater - 13. Electronic control unit - 14. Fuel return union with valve built in

(0.2 bar) - 15. Pump-injectors.

FUEL SUPPLY DIAGRAM

SECTION 2 - FUEL

F3B CURSOR ENGINES

Base - May 2007

73547

104243

73548

Figure 3

Figure 4

Figure 5

A. Fuel inlet — B. Fuel delivery — C. By-pass nut —

D. Fuel return from the pump-injectors —

E. Pressure relief valve — Opening pressure: 5 - 5.8 bars.

CROSS-SECTION OF THE FUEL PUMP

1. Oil and fuel leakage indicator.

Injector-pump

1. Fuel/oil seal — 2. Fuel/diesel seal — 3. Fuel/exhaust gas seal.

The injector-pump is composed of: pumping element, nozzle,
solenoid valve.

Pumping element
The pumping element is operated by a rocker arm governed
directly by the cam of the camshaft.
The pumping element is able to ensure a high delivery
pressure. The return stroke is made by means of a return
spring.

Nozzle
Garages are authorized to perform fault diagnosis solely on
the entire injection system and may not work inside the
injector-pump, which must only be replaced.
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).

Fuel pump

SECTION 2 - FUEL

F3B CURSOR ENGINES

Content .. 42 43 44 45 ..

Engines Iveco C10,C13, Cursor 10, Cursor 13. Manual - part 44