Iveco EuroCargo (12 to 26 t). Manual — part 24
70484
Figure 193
540480
Oil vapour recycling
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
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ENGINE F4 AE 0481
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70485
Figure 194
The closed loop forced-circulation cooling system consists of
the following components:
- expansion tank with plug, with two built-in valves:
exhaust valve (2) and intake valve (1) to control system
pressure;
- radiator, for dissipating the heat subtracted to engine by
coolant;
- viscous fan;
- heat exchanger to cool the lubricating oil (see
lubrication);
- centrifugal water pump set in the front part of the engine
block;
- thermostat to control coolant circulation.
COOLING SYSTEM LAYOUT
Water coming out from thermostat
Water recirculating in engine
Water coming into pump
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ENGINE F4 AE 0481
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COOLING SYSTEM
70486
70487
Figure 195
Figure 196
543210
Water Pump
The water pump is located in a housing obtained in the
engine block and is controlled by and a poly-V belt.
An automatic tensioner keeps the belt tension.
Viscous fan
Characteristics:
Max control speed:
2700 rpm
Max fan speed:
2565 rpm
±. 50 rpm
Operating temperature:
75
°C± 4°C at 2160 rpm
fan speed
Sec. A-A
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ENGINE F4 AE 0481
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70489
Figure 197
Figure 198
The thermostat of the by-pass type is located in the cylinder
head and doesn’t need regulations.
Whenever doubts on its operation are present, replace it.
On the thermostat body are fitted the thermometric
transmitter/switch and water temperature sensor.
A= stroke beginning: 79.4 — 83.3
° C
B= stroke at 100
° C: ≥ 6.6 mm
BOOSTER
542410
Turbosupercharger
GARRET TURBOSUPERCHARGER
Booster pressure: 1.5 bar..
Actuator (WASTEGATE) opening start: 1600 rpm
Description
The
booster
system is
composed of: air cleaner,
turbosupercharger and intercooler.
The air cleaner is a dry type composed of a filtering cartridge
that is periodically changeable.
The turbosupercharger has got the function of using the
energy of engine exhaust gas in order to send pressure air to
the cylinders.
It is essentially composed of:
- a main body where a shaft supported by bushes is
located. At the ends of the bushes the turbine rotor and
compressor rotor are fitted;
- a turbine body and a compressor body fitted on the end
of the main body;
- a waste gate valve applied on the turbine body used for
determining the portion of exhaust gases and sending a
part of them directly to the exhaust pipe, when the
booster pressure downstream the supercharger reaches
the calibration value;
- the intercooler is composed of a radiator applied on the
engine coolant radiator, and it is used for lowering the
temperature of the air coming out from the
turbosupercharger to send it to the cylinders.
Bearing end play check
Position the tracer point of the magnetic-base dial gauge on
the turbosupercharger shaft end and set to zero the dial
gauge.
Move the turbosupercharger shaft axially and check that the
clearance is not higher than the prescribed value.
Replace the turbosupercharger if a different value is found.
543250
Thermostat
Exhaust
Compressed air
!
Verifying an anomalous operation of the engine, due
to the booster system, it is recommended, before
performing controls on the turbosupercharger, to
check the efficiency of the sealing gaskets and the fix-
ing of the connection sleeves, making sure of clog-
ging absence inside intake sleeves, air cleaner or in-
side radiators. If the turbosupercharger damage is
due to a lack of lubrication, check that the oil circula-
tion pipes are not broken or obstructed, in such case
replace them or eliminate the trouble.
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12-26 t
92
ENGINE F4 AE 0481
Base - February 2003
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