Iveco Stralis AT/AD. Manual — part 56
S
TRALIS
AT/AD
210
F3A ENGINE
Base - January 2003
60631
Figure 210
Figure 211
Figure 212
543250
Thermostat
The water pump is composed of: impeller, bearing, seal and
driving pulley.
!
Check that the pump body has no cracks or water
leakage;if it does, replace the entire water pump.
CROSS-SECTION OF THE WATER PUMP
View of thermostat operation
60747
Water circulating in the engine
ÄÄÄ
ÄÄÄ
TO THE
EXPANSION
TUB
FROM
THE ENGINE
TO THE
BY PASS
Water leaving the thermostat
60748
TO THE
RADIATOR
TO THE
EXPANSION
TUB
TO THE
BY PASS
FROM
THE ENGINE
Check the thermostat works properly;replace it if in doubt.
Temperature of start of travel 84°C ±2°C.
Minimum travel 15 mm at 94°C ±2°C.
77469
Figure 213
543210
Electromagnetic coupling
As to the description of the electro-magnetic joint operation
and servicing, see the Manual for electric/electronic system
repairing" St. 603.93.191.
ÖÖ
ÖÖ
ÖÖ
ÖÖ
ÔÔ
ÔÔ
ÔÔ
ÔÔ
ÔÔ
ÔÔ
ELECTROMAGNETIC COUPLING SECTION
Using a feeler gauge, check the gap between the anchor
assembly (2) and the pulley (1), it must be no greater than 2.5
mm.
The electro-magnetic joint action depends on:
- the coolant temperature;
- the climate control system fluid pressure (if any);
- the slowing down action of the intarder on (if any).
Coolant temperature for:
- engagement
93°C
- disengagement
88°C
With climate control system
Climate control system fluid pressure:
- 1
st
speed engagement
18 bar
- 2
nd
speed engagement
22 bar
With intarder
With braking power below 41% of maximum power.
Coolant temperature for:
- 2
nd
speed engagement
93°C
- disengagement
88°C
With braking power over 41% of maximum power:
Coolant temperature for:
- 2
nd
speed engagement
85°C
- disengagement
80°C
211
S
TRALIS
AT/AD
F3A ENGINE
543210
Water pump
Figure 214
The turbocharging system consists of:
- air filter;
- variable geometry turbocharger;
- “intercooler” radiator.
60675
TURBOCHARGING DIAGRAM
Turbocharger HOLSET HY55V
Operating principle
The variable geometry turbocharger (VGT) consists of a
centrifugal compressor and a turbine, equipped with a
mobile device which adjusts the speed by changing the area
of the passing section of exhaust gases to the turbine.
Thanks to this solution, gas velocity and turbine speed can
be high even when the engine is idling.
If the gas is made to go through a narrow passage, in fact,
it flows faster, so that the turbine rotates more quickly.
The movement of the device, choking the exhaust gas
flowing section, is carried out by a mechanism, activated by
a pneumatic actuator.
This actuator is directly controlled by the electronic control
unit by a proportional solenoid valve.
The device is in maximum closing condition at idle speed.
At high engine operating speed, the electronic control
system is activated and increases the passing section, in
order to allow the in-coming gases to flow without
increasing their speed.
A toroidal chamber is obtained during the casting process
in the central body for the passage of the coolant.
Compressed air (hot)
Intake air
Engine exhaust gas
Compressed air (cooled)
S
TRALIS
AT/AD
212
F3A ENGINE
Base - January 2003
5424
TURBOCHARGING
CROSS-SECTION OF TURBOCHARGER
1. Air delivery to the intake manifold - 2. Compressor - 3. Air inlet - 4. Actuator - 5. Exhaust gas flow-rate adjustment ring -
6. Exhaust gas inlet - 7. Exhaust gas outlet - 8. Turbine - 9. Exhaust gas flow-rate control fork
71759
Figure 215
1. Air delivery to the intake manifold - 2. Compressor - 3. Air inlet - 4. Actuator -
5. Exhaust gas speed governor - 6. Exhaust gas inlet - 7. Exhaust gas outlet - 8. Turbine
71734
CROSS-SECTION OF MAXIMUM FLOW
71733
CROSS-SECTION OF MINIMUM FLOW
213
S
TRALIS
AT/AD
F3A ENGINE
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