Iveco Stralis AT/AD. Manual — part 18
green/black
Selection of connecting rod half-bearings (rectified pins)
If pins have been rectified, the procedure described must be applied.
In this case, (for each undersizing) determine the tolerance field the new big end pins belong to, and install the half-bearings
identified according to the relative table.
-0.127
1
2
3
72.789
72.798
green/black
green/black
green/black
green/black
green/black
green/black
red/black
red/black
green/black
green/black
green/black
red/black
red/black
red/black
red/black
green/black
green/black
72.799
72.808
72.809
72.818
1
2
3
red/black =
mm 2.074 to 2.083
green/black =
mm 2.063 to 2.073
-0.254
1
2
3
72.671
72.680
red
green
green
red
green
green
red
mm 2.127 to 2.137
green =
mm 2.138 to 2.147
-0.508
1
2
3
72.417
72.426
red
green
green
red
green
green
red
red
green
red
red
green
72.427
72.437
red
red
green
red
red
green
red
=
mm 2.254 to 2.264
green =
mm 2.265 to 2.274
72.681
72.691
Figure 74
58
ENGINE F2B
S
TRALIS
AT/AD
Base - January 2003
Install the half-bearings (1) on the main bearings in the
underblock (2).
Check the installation clearance between the main journals
and the relative bearings as follows:
Using the hoist and hook 99360500 (1) mount the driving
shaft (2).
After fitting the gear (1) on the crankshaft (2), heat it for
~15 minutes in an oven at temperature not higher than
180
°C.
Let them cool down after the installation.
If changing the pin (3), after fitting it on, check it protrudes
from the crankshaft as shown in the figure.
49020
47579
47578
49021
Figure 75
Figure 76
Figure 77
Figure 78
Install the oil spray nozzles (2) and have the dowel coincide
with the block hole (3).
Install the half-bearings (1) on the main bearings.
Check that the teeth of the gears are not damaged or worn,
otherwise remove them using the appropriate extractor.
540811
Checking main journal installation
clearance
1
2
ENGINE F2B
59
S
TRALIS
AT/AD
540815
Replacing the timing control gear and
the oil pump
End float is checked by placing a magnetic dial gauge (1) on
the crankshaft (2), as shown in the figure. If the value obtained
is higher than specified, replace the rear thrust half-bearings
and repeat this check.
- Lubricate inside screws (1) con UTDM oil, and tighten
them by dynamometric wrench to 140 Nm torque, thus
with 60º angle closing, following the diagram in Figure 81.
Place a piece of calibrated wire on the journal of the
crankshaft (2), parallel to the longitudinal axis; install the
underblock (1), by hoist and appropriate hooks.
49022
47579
47578
47588
44898
Figure 79
Figure 80
Figure 81
Figure 82
Figure 83
- Remove the under-block
The clearance between the main bearings and the journals
is obtained by comparing the calibrated wire length (2) at the
maximum deflection point, with the calibrated scale on the
coating (1) containing the calibrated wire (1).
Numbers shown on the scale specify the clearance in
coupling millimeters. If the clearance obtained is different
from the clearance required, replace the half-bearings and
repeat this check.
FRONT SIDE
Diagram showing the tightening order of the screws fixing the lower under-block to the block
Checking crankshaft end float
α
60
ENGINE F2B
S
TRALIS
AT/AD
Base - January 2003
Make sure the piston does show any trace of seizing, scoring,
cracking; replace as necessary.
49023
47580
Figure 84
Figure 85
PISTON CONNECTING ROD ASSEMBLY
1. Connecting rod body - 2. Half bearings - 3. Connecting rod cap - 4. Cap fastening screws - 5. Split ring - 6. Scraper ring with
spiral spring - 7. Bevel cut sealing ring - 8. Trapezoidal sealing ring - 9. Piston pin - 10. Piston
Removal of the piston split rings (2) using the pliers 99360184
(1).
Removal
Pistons are equipped with three elastic rings: a sealing ring, a
trapezoidal ring and a scraper ring.
Pistons are grouped into classes A and B for diameter.
49024
Figure 86
Remove the piston pin split rings (2) using the round tipped
pliers (1).
ENGINE F2B
61
S
TRALIS
AT/AD
5408
PISTON-CONNECTING ROD ASSEMBLY
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