Iveco Stralis AT/AD. Manual — part 46
Make sure the piston does show any trace of seizing, scoring,
cracking; replace as necessary.
60608
60607
Figure 88
Figure 89
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 90
Remove the piston pin split rings (2) using the round tipped
pliers (1).
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TRALIS
AT/AD
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F3A ENGINE
Base - January 2003
PISTON CONNECTING ROD ASSEMBLY
49025
32618
49026
Figure 91
Figure 92
Figure 93
Figure 94
Remove the piston pin (1).
If removal is difficult use the appropriate beater.
Measuring the diameter of the pistons
Measuring the gudgeon pin diameter (1) with a micrometer (2).
Conditions for correct gudgeon pin-piston coupling
Lubricate the pin (1) and the relevant housing on the piston
hubs with engine oil; piston must be inserted with a slight
finger pressure and it should not come out by gravity.
47584
Using a micrometer (2), measure the diameter of the piston
(1) to determine the assembly clearance; the diameter has to
be measured at the value X shown:
1
2
171
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F3A ENGINE
MAIN DATA OF THE PISTON, SUPPLIED BY MONDIAL PISTON, PISTON RINGS AND PIN
* Values are determined on
∅ of 120 mm.
16552
3513
Figure 95
Figure 96
Check the thickness of the piston ring (2) using a micrometer
(1).
The sealing ring (2) of the 1st cavity is trapezoidal. Clearance
“X” between the sealing ring and its housing is measured by
placing the piston (1) with its ring in the cylinder barrel (3),
so that the sealing ring is half-projected out of the cylinder
barrel.
540842
Piston rings
78904
60610
Check the clearance between the sealing rings (2) and the
relative piston housings (1) using a thikness gauge (3).
36134
Check the opening between the ends of the sealing rings (1),
using a thickness gauge (2), entered in the cylinder barrel (3).
If the distance between ends is lower or higher than the value
required, replace split rings.
Figure 97
Figure 98
Figure 99
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172
F3A ENGINE
Base - January 2003
47557
44927
Figure 100
Figure 101
MAIN DATA - BUSH, CONNECTING ROD, PIN AND HALF-BEARINGS
* Values to be obtained after installing the bush.
DIAGRAM OF THE CONNECTING ROD
MARKS
Letter indicating the weight class:
A
=
3973 to 4003 g.
B
=
4004 to 4034 g.
C
=
4035 to 4065 g.
Number indicating the selection of diameter for
the big end bearing housing:
1
=
87.000 to 87.010 mm
2
=
87.011 to 87.020 mm
3
=
87.021 to 87.030 mm
Numbers identifying cap-connecting rod coupling.
1
2
3
Data concerning the class section of connecting rod
housing and weight are stamped on the big end.
!
When installing connecting rods, make sure
they all belong to the same weight class.
VIEW FROM “A”
54.000
54.030
54.085
54.110
50.019*
50.035*
49.994
50.000
1.970
2.000
87.000
87.030
173
S
TRALIS
AT/AD
F3A ENGINE
540830
CONNECTING RODS
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