Iveco Stralis AT/AD. Manual — part 19
49025
32618
49026
Figure 87
Figure 88
Figure 89
Figure 90
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 should
be measured at the specified value.
62
ENGINE F2B
S
TRALIS
AT/AD
Base - January 2003
Drawing No. 500388370
MAIN DATA ON PISTONS, AND PISTONS RINGS
* Values are determined on
∅ of 112 mm.
16552
3513
Figure 91
Check the thickness of the piston ring (2) using a micrometer
(1).
The sealing ring (2) of the 1º 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
77816
16552
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 92
Figure 93
Figure 94
Figure 95
ENGINE F2B
63
S
TRALIS
AT/AD
47557
44927
Figure 96
Figure 97
MAIN DATA - BUSH, CONNECTING ROD, PIN AND HALF-BEARINGS
* Values to be obtained after installing the bush
DIAGRAM CONNECTING ROD MARKS
Letter indicating the weight class:
A
=
2890 to 2920 g.
B
=
2921 to 2950 g.
C
=
2951 to 2980 g.
Number indicating the selection of diameter for
the big end bearing housing:
1
=
77.000 to 77.010 mm
2
=
77.011 to 77.020 mm
3
=
77.021 to 77.030 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”
64
ENGINE F2B
S
TRALIS
AT/AD
Base - January 2003
CONNECTING ROD
Check the torsion of the connecting rod (5) by comparing
two points (A and B) of the pin (3) on the horizontal plane
of the axis of the connecting rod.
Position the mount (1) of the dial gauge (2) so that this
pre-loads by approx. 0.5 mm on the pin (3) at point A and
zero the dial gauge (2). Shift the spindle (4) with the
connecting rod (5) and compare any deviation on the
opposite side B of the pin (3): the difference between A and
B must be no greater than 0.08 mm.
Check the bending of the connecting rod (5) by comparing
two points C and D of the pin (3) on the vertical plane of the
axis of the connecting rod.
Position the vertical mount (1) of the dial gauge (2) so that this
rests on the pin (3) at point C.
Swing the connecting rod backwards and forwards seeking the
highest position of the pin and in this condition zero the dial
gauge (2).
Shift the spindle (4) with the connecting rod (5) and repeat
the check on the highest point on the opposite side D of the
pin (3). The difference between point C and point D must be
no greater than 0.08 mm.
61695
61696
Checking axis alignment
Check the alignment of the axes of the connecting rods (1)
with device 99395363 (5), proceeding as follows:
- Fit the connecting rod (1) on the spindle of the tool
99395363 (5) and lock it with the screw (4).
- Set the spindle (3) on the V-prisms, resting the connecting
rod (1) on the stop bar (2).
49029
Figure 98
Figure 99
Figure 100
Figure 101
To fit the piston rings (1) on the piston (2) use the pliers
99360184 (3).
The rings need to be mounted with the word ”TOP” (4)
facing upwards. Direct the ring openings so they are
staggered 120
° apart.
Mounting the connecting rod - piston assembly
Carry out the steps for removal described on page 61 in
reverse order.
!
The connecting rod screws can be reused as long as
the diameter of the thread is not less than 13.4 mm.
Mounting the piston rings
Checking torsion
61694
Checking bending
ENGINE F2B
65
S
TRALIS
AT/AD
Checking connecting rod alignment
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