Iveco Stralis AT/AD. Manual — part 55
The oil pressure control valve is located on the left-hand side
of the crankcase.
Start of opening pressure 5 bars.
73542
73543
Figure 203
Figure 204
Figure 205
MAIN DATA TO CHECK THE OIL PRESSURE
CONTROL VALVE SPRING
HEAT EXCHANGER
The heat exchanger is fitted with: 1. Oil temperature sensor - 2. Oil pressure sensor for pressure gauge - 3. Transmitter for
low pressure warning lamp - 4. By-pass valve - 5. Heat valve. Number of elements 9
Oil pressure control valve
543110
Heat exchanger
78950
S
TRALIS
AT/AD
206
F3A ENGINE
Base - January 2003
This is a new generation of filters that permit much more
thorough filtration as they are able to holder back a greater
amount of particles of smaller dimensions than those held
back by conventional filters with a paper filtering element.
These high-filtration devices, to date used only in industrial
processes, make it possible to:
- reduce the wear of engine components over time;
- maintain the performance/specifications of the oil and
thereby lengthen the time intervals between changes.
External spiral winding
The filtering elements are closely wound by a spiral so that
each fold is firmly anchored to the spiral with respect to the
others. This produces a uniform use of the element even in
the worst conditions such as cold starting with fluids with a
high viscosity and peaks of flow. In addition, it ensures uni-
form distribution of the flow over the entire length of the
filtering element, with consequent optimization of the loss of
load and of its working life.
Mount upstream
To optimize flow distribution and the rigidity of the filtering el-
ement, this has an exclusive mount composed of a strong mesh
made of nylon and an extremely strong synthetic material.
Filtering element
Composed of inert inorganic fibres bound with an exclusive
resin to a structure with graded holes, the element is manu-
factured exclusively to precise procedures and strict quality
control.
Mount downstream
A mount for the filtering element and a strong nylon mesh
make it even stronger, which is especially helpful during cold
starts and long periods of use. The performance of the filter
remains constant and reliable throughout its working life and
from one element to another, irrespective of the changes in
working conditions.
Structural parts
The o-rings equipping the filtering element ensure a perfect
seal between it and the container, eliminating by-pass risks
and keeping filter performance constant. Strong corrosion-
proof bottoms and a sturdy internal metal core complete the
structure of the filtering element.
When mounting the filters, keep to the following rules:
- Oil and fit new seals.
- Screw down the filters to bring the seals into contact
with the supporting bases.
- Tighten the filter to a torque of 35-40 Nm.
73545
47447
73546
Figure 206
Figure 207
Figure 208
The valve quickly opens at a pressure of: 3 bars.
Thermostatic valve
Start of opening:
- travel 0.1 mm at a temperature of 82
±2°C
.
End of opening:
- travel 8 mm at a temperature of 97
°C
.
Engine oil filters
By-pass valve
207
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AT/AD
F3A ENGINE
S
TRALIS
AT/AD
208
F3A ENGINE
Base - January 2003
Figure 209
Description
The engine cooling system works with forced circulation
inside closed circuit and can be connected to an additional
heater (if any) and to the intarder intercooler.
It consists mainly of the following components:
- an expansion reservoir whose plug (1) incorporates two
valves — discharge and charge — controlling the system
pressure.
- a coolant level sensor placed at the bottom of the
expansion reservoir with two coupling points:
D
coupling point for sensor S1
6 litres
D
coupling point for sensor S2
3.7 litres
- an engine cooling unit to dissipate the heat taken by the
coolant from the engine through the intercooler.
- a heat exchanger to cool down lubrication oil;
- a water pump with centrifugal system incorporated in
the cylinder block;
- an electric fan consisting of a 2-speed electro-magnetic
joint equipped with a neutral wheel shaft hub fitted with
a metal plate moving along the axis and where the fan
is installed. It is controlled electronically by the vehicle
Multiplex system.
- a 3-way thermostat controlling the coolant circulation.
Operation
The water pump is actuated by the crankshaft through a
poli-V belt and sends coolant to the cylinder block, especially
to the cylinder head (bigger quantity). When the coolant
temperature
reaches
and overcomes
the
operating
temperature, the thermostat is opened and from here the
coolant flows into the radiator and is cooled down by the fan.
The pressure inside the system depending on the
temperature variation is controlled by the discharge and
charge valves incorporated in the expansion reservoir filling
plug (1).
The discharge valve has a double function:
- keep the system under light pressure in order to raise the
coolant boiling point;
- discharge the pressure surplus in the atmosphere as a
result of the coolant high temperature.
The charge valve makes it possible to transfer the coolant
from the expansion reservoir to the radiator when a
depression is generated inside the system as a result of the
coolant volume reduction depending on the fall in the
coolant temperature.
Discharge valve opening:
D
1
st
breather
0.9
bar
D
2
nd
breather
1.2
bar
Charge valve opening
-0.03
bar
79553
A
A
Water leaving the thermostat
Water entering the pump
Water circulating in the engine
Vent
Elements specific of version with
INTARDER
Detail of system without heater
+ 0.2
- 0.1
+ 0.2
- 0.1
+ 0
- 0.02
209
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AT/AD
F3A ENGINE
5432
COOLING
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