Iveco Stralis AT/AD. Manual — part 49
47506
47505
47507
Figure 128
Figure 129
Figure 130
541211
Checking cam lift and pin alignment
When the camshaft (4) is on the tailstock (1), check alignment of supporting pin (3) using a centesimal gauge (2); it must not exceed
0.035 mm. If misalignment exceeds this value, replace the shaft.
In order to check installation clearance, measure bush inner diameter and camshaft pin (1) diameter; the real clearance is obtained
by their difference.
If clearance exceeds 0.150 mm, replace bushes and, if necessary, the camshaft.
Place the camshaft (4) on the tailstock (1) and check cam lift (3) using a centesimal gauge (2); values are shown in table on page 21.
1
S
TRALIS
AT/AD
182
F3A ENGINE
Base - January 2003
Timing system
The bush surfaces must not show any sign of seizing or
scoring; if they do replace them.
60626
60627
Figure 131
Figure 132
MAIN DATA - CAMSHAFT AND TOLERANCES
The surfaces of shaft supporting pin and cams must be extremely smooth; if you see any sign of seizing
or scoring, replace the shaft and the relative bushes.
MAIN DATA OF CAMSHAFT BUSHES AND RELEVANT HOUSINGS ON CYLINDER HEAD
* Bush inner diameter after installation
541213
Bushings
Measure the bush inner diameters with a baremeter and replace
them, if the value measured exceeds the tolerance value.
To take down and fit back the bushes, use the proper tool
99360499.
183
S
TRALIS
AT/AD
F3A ENGINE
‘
Camshaft
TOLERANCES
TOLERANCE CHARACTERISTIC
SYMBOL
ORIENTATION
Perpendicularity
⊥
POSITION
Concentricity or coaxial alignment
OSCILLATION
Circular oscillation
↗
IMPORTANCE CLASS ASSIGNED TO PRODUCT CHARACTERISTICS
SYMBOL
CRITICAL
IMPORTANT
⊕
SECONDARY
⊝
77795
71721
Figure 133
Figure 134
A
=
Drift with seat for bushings to insert/extract.
B
=
Grub screw for positioning bushings.
C
=
Reference mark to insert seventh bushing correctly.
D
=
Reference mark to insert bushings 1, 2, 3, 4, 5, 6 correctly (red marks).
E
=
Guide bushing.
F
=
Guide line.
G
=
Guide bushing to secure to the seventh bushing mount.
H
=
Plate fixing bushing G to cylinder head.
I
=
Grip.
L
=
Extension coupling.
Assemble the drift together with the extension.
To insert bushings 1, 2, 3, 4 and 5, proceed as follows:
4 position the bushing to insert on the drift (A) making the
grub screw on it coincide with the seat (B) (Figure 133)
on the bushing.
5 position the guide bushing (E) and secure the guide
bushing (G) (Figure 133) on the seat of the 7
th
bushing
with the plate (H).
6 while driving in the bushing, make the reference mark (F)
match the mark (M). In this way, when it is driven home,
the lubrication hole on the bushing will coincide with the
oil pipe in its seat.
The bushing is driven home when the 1
st
red reference
mark (D) is flush with the guide bushing (G).
71725
Figure 135
The sequence for removing the bushings is 7, 6, 5, 4, 3, 2, 1.
The bushings are extracted from the front of the single seats.
Removal does not require the drift extension for bushings 5,
6 and 7 and it is not necessary to use the guide bushing.
For bushings 1, 2, 3 and 4 it is necessary to use the extension
and the guide bushings.
Position the drift accurately during the phase of removal.
Removal
Assembly
Front
Rear
A B C
D
E
F
D
L
G
H D
I
S
TRALIS
AT/AD
184
F3A ENGINE
Base - January 2003
Replacing camshaft bushings with drift 99360499
71723
71724
Figure 136
Figure 137
To insert the bushing (6), proceed as follows:
- Unscrew the grip (I) and the extension (N).
- Position the extension (N) and the guide bushing (E) as
shown in the figure.
- Repeat steps 1, 2, 3.
To insert bushing (7), proceed as follows:
- Unscrew the grip (I) and the extension (N).
- Refit the guide (G) from the inside as shown in the figure.
- Position the bushing on the drift (A) and bring it close
up to the seat, making the bushing hole match the
lubrication hole in the head. Drive it home.
The 7
th
bushing is driven in when the reference mark (C)
is flush with the bushing seat.
Front
Rear
Front
Rear
70000
Figure 138
Figure 139
MAIN DATA TO CHECK THE SPRING
FOR INTAKE AND EXHAUST VALVES
540665
Valve springs
Before assembly, the flexibility of the valve springs has to be
checked with the tool 99305047.
Compare the load and elastic deformation data with those
of the new springs given in the following figure.
49034
Free spring height
Valve closed
Valve open
500
± 25
972
± 48
75
61
47,8
185
S
TRALIS
AT/AD
F3A ENGINE
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст