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Engines Iveco N45, N67. Manual - part 36

Figure 1

106529

Water leaving the thermostat

Coolant recirculating in the engine

Water entering the pump

DIAGRAM OF THE COOLING SYSTEM

COOLING SYSTEM

The engine cooling system, closed circuit forced circulation
type, generally incorporates the following components:

- Expansion tank; placement, shape and dimensions are

subject to change according to the engine’s equipment.

- Radiator, which has the duty to dissipate the heat

subtracted to the engine by the cooling liquid. Also this
component will have specific peculiarities based on the
equipment developed, both for what concerns the
placement and the dimensions.

- Viscous pusher fan, having the duty to increase the heat

dissipating power of the radiator. This component as well
will be specifically equipped based on the engine’s
development.

- Heat exchanger to cool the lubrication oil: even this

component is part of the engine’s specific equipment.

- Centrifugal water pump, placed in the front part of the

engine block.

- Thermostat regulating the circulation of the cooling liquid.

- The circuit may eventually be extended to the

compressor, if this is included in the equipment.

SECTION 1 - GENERAL SPECIFICATIONS

G-DRIVE ENGINES

Base - February 2006

Print P2D32N00GB

Figure 2

AIR INDUCTION - BOOST DIAGRAM

Description

The turbocharger is composed by the following main parts:
one turbine, one transforming valve to regulate the boost
feeding pressure , one main body and one compressor.

During engine working process, the exhaust emissions flow
through the body of the turbine, causing the turbine disk
wheel’s rotation.

The compressor rotor, being connected by shaft to the
turbine disk wheel, rotates as long as this last one rotates,
compressing the drawn air through the air filter.

The above mentioned air is then cooled by the radiator and
flown through the piston induction collector.

The turbocharger is equipped with a transforming valve to
regulate the pressure , that is located on the exhaust collector
before the turbine and connected by piping to the induction
collector.

It’s funchon is to restrict the exhaust of the emissions , releasing
part of them directly to the exhaust tube when the boost
feeding pressure, over the compressor, reaches the
prescribed bar value.

The cooling process and the lubrication of the turbocharger
and of the bearings is made by the oil of the engine.

106548

Compressed air to the heat exchanger

Refrigerated compressed air to the pistons

Exhaust gas

Intake air

TURBOCHARGING DIAGRAM

SECTION 1 - GENERAL SPECIFICATIONS

G-DRIVE ENGINES

Print P2D32N003GB

Base - February 2006

Figure 3

1. Pre-separator - 2. Exhaust to the outside (temporary) - 3. Filter - 4. Return to engine.

The tappet cover houses the pre-separator (1), whose shape and position determines an increase in oil vapour outlet speed and
condenses a part of vapours at the same time.

Condensate oil returns to the oil sump whereas the residual vapours are ducted, collected and filtered in the blow-by (3).

In the blow-by (3), part of the vapours condense and return to the oil sump whereas the remaining part is put into cycle again
through pipe (2).

Oil condensate

Oil vapours

OIL VAPOUR RECYCLING

108729

SECTION 1 - GENERAL SPECIFICATIONS

G-DRIVE ENGINES

Base - February 2006

Print P2D32N00GB

SECTION 2 - G-DRIVE APPLICATION

G-DRIVE ENGINES

Print P2D32N003GB

Base - February 2006

GENERAL SPECIFICATIONS

Type

FAHE9685A

Cycle

Four-stroke diesel engine

Power

Supercharged with intercooler

Injection

Direct

Number of cylinders

∅

Bore

104

Stroke

132

+.. =

Total displacement

6728

TIMING

start before T.D.C.

end after B.D.C.

18.5º
29.5º

start before B.D.C.

end after T.D.C.

67º
35º

Checking timing

Checking operation

0.20 to 0.30

0.45 to 0.55

FUEL FEED

Injection
Type:

Bosch

high pressure common rail

EDC7 ECU

Nozzle type

Injectors

Injection sequence

1 - 5 - 3 - 6 - 2 - 4

bar

Injection pressure

bar

250

÷ 1450

Content .. 34 35 36 37 ..