Iveco EuroCargo (12 to 26 t). Manual — part 17
70194
70195
70196
Figure 82
Figure 83
Figure 84
Use feeler gauge (1) to measure the clearance between the
ends of the split rings (2) fitted into the cylinder barrel (3).
MAIN DATA FOR CONNECTING ROD, BUSH, PISTON
PIN AND HALF BEARINGS
* Value for inside diameter to be obtained after driving in
connecting rod small end and grinding.
** Value not measurable in released condition
540834
Bushes
Check that the bush in the connecting rod small end is free
from scoring or seizing and that it is not loosen. Otherwise
replace.
Removal and refitting shall be performed using the proper
beater.
When refitting take care to make coincide the oil holes set
on the bush with those set on the connecting rod small end.
Grind the bush to obtain the specified diameter.
540830
Connecting rods
!
Every connecting rod is marked as follows:
- On body and cap with a number showing their
coupling and the corresponding cylinder.
In case of replacement it is therefore necessary
to mark the new connecting rod with the same
numbers of the replaced one.
- On body with a letter showing the weight of the
connecting rod assembled at production:
S
V, 1820 - 1860 (yellow marking);
S
W, 1861 - 1900 (green marking);
S
X, 1901 - 1940 (blue marking);
Spare connecting rods are of the W class with green
marking*.
Material removal is not allowed.
*
*
*
*
*
*
!
To obtain best coupling the connecting rod-cap
coupling surfaces are knurled.
It is therefore recommended to not remove
knurling.
E
URO
C
ARGO
T
ECTOR
12-26 t
58
ENGINE F4 AE 0481
Base - February 2003
1234
W
CONNECT-
ING ROD No.
WEIGHT
0001
V
↓
W
9999
X
CONNECTING ROD CAP
1234
A
123
CONNECTING
ROD No.
YEAR
DAY
0001
A 1998
001
↓
B 1999
↓
9999
C 2000
366
D 2001
61696
61694
61695
70198
Figure 85
Figure 86
Figure 87
Figure 88
Check that the axes of the connecting rods (1) are parallel
using tool 99395363 (5) as follows:
- fit the connecting rod (1) on tool 99395363 (5) spindle
and lock it with screw (4);
- set the spindle (3) on V-blocks by resting the connecting
rod (1) on the stop bar (2).
Check connecting rod (5) torsion by comparing two points
(A and B) of pin (3) on the horizontal plane of the connecting
rod axis.
Position the dial gauge (2) support (1) to obtain a preload of
approx. 0.5 mm on the pin (3) in point A and then set the
dial gauge (2) to zero. Move 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 shall not exceed 0.08 mm.
Check connecting rod (5) bending by comparing two points
C and D of the pin (3) on the vertical plane of the connecting
rod axis.
Position the vertical support (1) of the dial gauge (2) to rest
the latter on pin (3), point C.
Move the connecting rod forwards and backwards to find pin
top position, then in this condition reset the dial gauge (2).
Move the spindle with the connecting rod (5) and repeat the
check of the top point on the opposite side D of the pin (3).
The difference between point C and point D shall not exceed
0.08 mm.
Fitting connecting rod-piston assembly
Connecting rod-piston coupling
The piston crown is marked as follows:
1.
Part number and design modification number;
2.
Arrow showing piston assembling direction into cylinder
barrel, this arrow shall face the front key of the engine
block;
3.
Marking showing 1
st
slot insert testing;
4.
Manufacturing date.
Checking connecting rods
Checking bending
Checking torsion
E
URO
C
ARGO
T
ECTOR
12-26 t
ENGINE F4 AE 0481
59
Base - February 2003
72705
70199
32613
70200
70201
Figure 89
Figure 90
Figure 91
Figure 92
Figure 93
Connect piston (2) to connecting rod (4) with pin (3) so that
the reference arrow (1) for fitting the piston (2) into the
cylinder barrel and the numbers (5) marked on the
connecting rod (4) are read as shown in the figure.
Fit pin (1) split rings (2).
Fitting split rings
Use pliers 99360183 (3) to fit the split rings (1) on the piston
(2).
Split rings shall be fitted with the marking “TOP” facing
upwards and their openings shall be displaced with each
other by 120
°.
Fit half bearings (1) on connecting rod and cap.
Lubricate accurately the pistons, including the split rings and
the cylinder barrel inside.
Use band 99360605 (2) to fit the connecting rod-piston
assembly (1) into the cylinder barrels and check the following:
- the number of each connecting rod shall correspond to
the cap coupling number.
!
Split rings are supplied spare with the following sizes:
-
standard, yellow marking;
-
0.5 mm oversize, yellow/green marking;
Fitting connecting rod-piston assembly into
cylinder barrels
!
Refit the main bearings that have not been replaced,
in the same position found at removal.
Do not try to adapt the half bearings.
E
URO
C
ARGO
T
ECTOR
12-26 t
60
ENGINE F4 AE 0481
Base - February 2003
70202
70203
70204
70205
70206
Figure 94
Figure 95
Figure 96
Figure 97
Figure 98
DIAGRAM FOR CONNECTING ROD-PISTON
ASSEMBLY FITTING INTO BARREL
- split ring openings shall be displaced with each other by
120
°;
- connecting rod-piston assemblies shall have the same
weight;
- the arrow marked on the piston crown shall be facing the
front side of the engine block or the slot obtained on the
piston skirt shall be corresponding to the oil nozzle
position.
540831
Finding crankpin clearance
To measure the clearance proceed as follows:
- clean the parts accurately and remove any trace of oil;
- set a piece of calibrated wire (2) on the output shaft pins
(1);
- fit the connecting rod caps (3) with the relevant half
bearings (4).
- lubricate the screws (1) with engine oil and then tighten
them to the specified torque using the dynamometric
wrench (2).
- apply tool 99395216 (1) to the socket wrench and
tighten screws (2) of 60
°.
- remove the cap and find the existing clearance by
comparing the calibrated wire width (1) with the scale
on the wire envelope (2).
α
α
E
URO
C
ARGO
T
ECTOR
12-26 t
ENGINE F4 AE 0481
61
Base - February 2003
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст