Iveco EuroCargo (12 to 26 t). Manual — part 21
70336
70337
70338
70339
70133
Figure 152
Figure 153
Figure 154
Figure 155
Figure 156
Refit the cylinder head (1), tighten the screws (2) in three
successive stages according to the sequence and procedure
shown in the following figure.
Cylinder head fastening screw tightening sequence:
- 1
st
stage pre-tightening, with dynamometric wrench:
• Screw 12x1.75x130 ( ) 35
± 5 Nm
• Screw 12x1.75 x 150 ( ) 55
± 5 Nm
- 2
nd
stage, tightening to 90
° ± 5° angle
- 3
rd
stage, tightening to 90
° ± 5° angle
A = front side
Fit a new sealing ring (2) lubricated with vaseline and a new
sealing washer (3) on injector (1).
Fit injectors (1) on the cylinder head seats, directed so that
the fuel inlet hole (2) is facing the fuel manifold seat (3) side.
Use tool 99342101 (1) to fit the injector (2) into its seat.
Screw injector fastening screws without tightening them.
!
Use tool 99395216 (3) to tighten to angle.
α
α
s
A
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ENGINE F4 AE 0481
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Rocker control rods shall not be distorted; the ball seats in
touch with the rocker adjusting screw and with tappets
(arrows) shall not show seizing or wear; otherwise replace
them. Intake and exhaust valve control rods are identical and
are therefore interchangeable.
70341
70342
32655
70343
70344
Figure 157
Figure 158
Figure 159
Figure 160
Figure 161
Fit a new sealing ring (3) lubricated with vaseline on the fuel
manifold (2) and fit it into the cylinder head seat so that the
positioning ball (5) is coinciding with the relevant housing (4).
Screw the fastening nuts (2, Figure 158) without locking
them.
Use the dynamometric wrench to tighten gradually and
alternately the injector fastening screws (1) to 8.5
± 0.8 Nm
torque.
Tighten the fuel manifold (3) fastening nuts (2) to 50 Nm
torque.
ROCKER ASSEMBLY COMPONENTS:
1. Screws - 2. Bracket - 3. Shafts - 4. Rockers.
!
During this operation, the injector (1) shall be
moved so that the manifold (2) is properly inserted
into the fuel inlet hole (2, Figure 155).
501230
Rocker assembly
SHAFT-ROCKER MAIN DATA
Check that shaft/rocker coupling surfaces are not showing
excessive wear or damages.
!
Removed fuel manifolds (2) shall not be reused but
replaced with new ones.
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ENGINE F4 AE 0481
75
Base - February 2003
RODS
70345
70346
70520
Figure 162
Figure 163
Figure 164
Fit the rods (2).
Position jumpers (1) on valves with marks (
→) facing the
exhaust manifold.
Check that tappet adjusters (1) are loosen to prevent their
balking on the rods (2, Figure 162) when refitting the rocker
assembly.
Then refit the rocker assembly consisting of: bracket (5),
rockers (3), shafts (4) and secure them to the cylinder head
by tightening the fastening screws (2) to 36 Nm torque.
Adjust clearance between rockers and valves using setscrew
wrench (1), box wrench (3) and feeler gauge (2).
Working clearance shall be as follows:
-
intake valves 0.25
± 0.05 mm
-
exhaust valves 0.51
± 0.05 mm
!
To carry out rocker-valve clearance adjustment
more quickly, proceed as follows:
rotate the output shaft, balance the valves of cylinder
No. 1 and adjust the valves marked with an asterisk
in the tables below:
Rotate the output shaft, balance the valves of
cylinder No. 4 and adjust the valves marked with an
asterisk in the table below:
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ENGINE F4 AE 0481
Base - February 2003
cylinder No.
1
2
3
4
intake
-
-
*
*
exhaust
-
*
-
*
cylinder No.
1
2
3
4
intake
*
*
-
-
exhaust
*
-
*
-
70347
Figure 165
The intake manifold (4) houses the air heater (5) for cold
starting. In case of failure it shall be replaced by removing the
cap (6), the nuts (1), the sealing washers (2) and the washers
(3). Fit the new heater (5) following the removal operations
in reverse order.
Apply a new sealing ring (10) to the air temperature/pressure
sensor and fit it on the intake manifold (4), tighten the screws
(8) to the specified torque.
!
The sealing washers (2) shall be replaced with new
ones.
The nuts (1) shall be tightened to the specified torque.
Intake manifold
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ENGINE F4 AE 0481
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Base - February 2003
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