Iveco EuroCargo (12 to 26 t). Manual — part 33
70332
85486
Figure 13
Figure 14
If valve seats cannot be restored just by regrinding, it is
possible to assemble the spare inserts provided.
In this case, it is necessary to obtain seats into the cylinder
head sized as shown in the figure and to assemble the valve
seats.
VALVE SEAT MAIN DATA
In order to assemble the valve seats into the cylinder head,
it is necessary to heat the cylinder head to 80
° - 100°C and,
through a suitable beater, to assemble the new, previously
cooled valve seats (2) into the head.
Then, with tool 99305018, adjust valve seats according to the
values shown in Figure 14.
EXHAUST
INTAKE
EXHAUST
INTAKE
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Cylinder head fastening screw tightening
Tightening order layout for cylinder head fastening screws:
- 1
st
step pre-tightening with dynamometric wrench:
• Screw 12x1,75x130 ( ) 35
± 5 Nm
• Screw 12x1,75 x 150 ( ) 55
± 5 Nm
- 2
nd
step tightening with a 90
° ± 5° angle
- 3
rd
step tightening with a 90
° ± 5° angle
A = Front side
Figure 15
Figure 16
Adjust the clearance between rocker arms and valves
through setscrew wrench (1), box wrench (3) and feeler
gauge (2).
The operating clearance is:
-
± 0.05
-
intake valves 0.25
± 0.05 mm
-
exhaust valve 0.51
± 0.05 mm
70476
Assemble cylinder head (1), tighten the screws (2) in three
following steps, following order and mode shown in the
figure below.
!
The angle tightening is carried out through tool
99395216 (3).
α
Figure 17
70520
!
In order to more quickly perform the operating
clearance adjustment for rocker arms — valves,
proceed as follows:
rotate the drive shaft, balance cylinder 1 valves and
adjust the valves marked by the asterisk as shown in
the table:
Rotate the drive shaft, balance cylinder 6 valves and
adjust the valves marked by the asterisk as shown in
the table:
α
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ENGINE F4 AE 0681
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1
2
3
4
5
6
intake
-
-
*
-
*
*
exhaust
-
*
-
*
-
*
cylinder n.
1
2
3
4
5
6
intake
*
*
-
*
-
-
exhaust
*
-
*
-
*
-
70516
Figure 18
The forced-circulation lubrication is carried out by the
following components:
- rotor oil pump (5), housed in the front block part,
controlled by the straight-tooth gear keyed to the
output shaft tang;
- water/oil heat exchanger (3), housed in engine block,
with oil filter support;
- oil pressure relief valve (1) embedded into filter support;
- by-pass valve (4) to cut off clogged oil filter, embedded
into filter support;
- cartridge oil filter (2).
Routing of oil under pressure
Routing of oil return by gravity
to sump
Introduction of oil
LUBRICATION SYSTEM LAYOUT
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LUBRICATION
70517
Figure 19
The
engine
cooling
system,
of
the
closed-loop
forced-circulation type, is composed of the following
components:
- expansion tank whose plug embeds two valves: an
exhaust valve (2) and an intake valve (1), that adjust the
system pressure;
- radiator, whose task is dissipating heat subtracted to
engine by coolant;
- viscous fan;
- an heat exchanger to cool lubricating oil (see
lubrication);
- a water pump of the centrifugal type housed in the front
engine block part;
- a thermostat adjusting coolant circulation.
COOLING SYSTEM LAYOUT
Water coming out
from thermostat
Water recirculating in engine
Water coming into pump
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COOLING SYSTEM
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