Iveco EuroCargo (12 to 26 t). Manual

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:

V, 1820 - 1860 (yellow marking);

W, 1861 - 1900 (green marking);

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.

URO

ARGO

ECTOR

12-26 t

ENGINE F4 AE 0481

Base - February 2003

1234

CONNECT-

ING ROD No.

WEIGHT

0001

↓

9999

CONNECTING ROD CAP

1234

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;

Arrow showing piston assembling direction into cylinder
barrel, this arrow shall face the front key of the engine
block;

Marking showing 1

slot insert testing;

Manufacturing date.

Checking connecting rods

Checking bending

Checking torsion

URO

ARGO

ECTOR

12-26 t

ENGINE F4 AE 0481

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.

URO

ARGO

ECTOR

12-26 t

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).

URO

ARGO

ECTOR

12-26 t

ENGINE F4 AE 0481

Base - February 2003

Content .. 15 16 17 18 ..

Iveco EuroCargo (12 to 26 t). Manual - part 17