Engine Iveco Vector 8. Manual — part 39

Figure 60

Figure 61

Figure 62

PRINCIPAL ROD, BUSHING, GUDGEON PIN AND

BEARING HALF DATA

* internal diameter to check on the rod small end

- Using a feeler gauge (3) check the gap between the ends

of the piston rings (2) once they have been fitted into the
cylinder liners (1).

Connecting rods

CONROD BUSHING

ROD HALF (LOWER AND UPPER)

Figure 63

Figure 64

The ring (2) of the first slot has a V—shape.
The clearance ”X” between a ring and its seat is measured by
placing the piston (1), with its ring, in the cylinder liner (3) so
that the ring comes half—way out of the cylinder liner.

The upper bushing of the connecting rod cannot be
replaced.

*

3613

83434

16826

83420

82267

NOTE

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SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

VECTOR 8 ENGINES

Base - April 2006

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Figure 65

Figure 66

Figure 67

Use apparatus 99395363 (1) to check parallelism of the rod
arms. The maximum permitted tollerance is

± 0.05 mm,

measured at 125 mm from the longitudinal axis of the rod. If
a misalignment exceeding the permitted tolerance is encoun-
tered, replace the rod.

- Position the piston (1) on the rod (3), insert the pin (4)

and secure it with the piston rings (2).

- Insert the piston rings (2) on the piston using pliers

99360183 (1).

The body and cap of every connecting rod is marked
with a number indicating the part with which is to be
mated. In addition, the number of the cylinder where
the rod should be installed may be stamped on it.
Therefore, when replacing the rod, it is necessary to
mark the new rod with the same number as the rod
whitch is being replaced.

!

Fitting the piston rings

1

Check of connecting rod alignment

Fitting the connecting rod—piston assembly
Connecting rod—piston mating

The connecting rod — piston coupling must be made
taking account that, on fitting the assembly in the cylin-
der block, the wording ”TAPPET SIDE” (stamped on
the crown of the piston) must be facing the tappet
side of the engine and the numbering of the connect-
ing rods must be facing the corresponding numbering
stamped on the cylinder block.

16557

37715

16817

NOTE

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

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VECTOR 8 ENGINES

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The connecting rod — piston assemblies (1) are fitted in the
cylinder liners with the aid of the flexible band 99360603 (2)
observing the following requirements:

- lubricate the pistons, piston rings and cylinder liners with

engine oil;

- take the crankpin of the piston involved in assembly to

T.D.C.;

- the number of the connecting rod must correspond to

the number of the cylinder liner in which it is inserted and
must face the same side as that stamped on the cylinder
block; in addition, the wording ”TAPPET SIDE” on the
crown of the piston must face the camshaft;

- the gaps in the piston rings must be staggered 120

° apart.

Refit the main bearings that have not been replaced,
in the same position found at removal.
Do not try to adapt the half bearings.

Figure 68

After assembling the rod—piston group (1) check the squaring
using apparatus 99395363 (3) and feeler gauge (2). Squaring
must be exact otherwise the cause should be found and faulty
part replaced.

DIAGRAM FOR INSERTING THE CONNECTING

ROD-PISTON ASSEMBLY IN CYLINDER

1. Tappet side — 2. Camshaft

Fitting the rod—piston assemblies into the
cylinder liners

1

2

3

If it is not necessary to replace the big end bearings,
they must be reassembled according to the same
order and position found upon disassembly.

- Fit half bearings (1) on connecting rod and cap.

Figure 69

Figure 70

Figure 71

37716

Check of rod/piston alignment

81350

16793

37717

NOTE

NOTE

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SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

VECTOR 8 ENGINES

Base - April 2006

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Figure 72

Figure 73

Figure 74

To check the clearance proceed as follows:

- clean all the parts accurately and remove any traces of oil;

- arrange the bearings in their seats;

- place a length of calibrated wire (1) on the drive shaft pins

(2).

- connect the connecting rods to the journals of the

crankshaft and fit the connecting rod caps together with
the half bearings;

- tighten the screws, which have been previously lubricated

with UTDM oil, with a dynamometer spanner to a
prescribed torque;

- remove the cap.

Measure the existing play by comparing the width of the
calibrated wire with the graduated scale shown on the package
which contained the wire. If the measured play is not equal to
the prescribed value, replace the bearing halves and repeat the
check.

- When the rod—piston group have been assembled, check

for piston protrusion at T.D.C. from the upper engine
block level.

- The protrusion should be from — 0.21 to +0.59 mm.

α

!

Upon final reassembly, the big end cap fastening
screws must always be replaced.

- Manually check that the connecting rods can be moved

sideways on the drive shaft pins.

Check of piston protrusion

Fitting the connecting rod caps

- Thoroughly clean the journals of the crankshaft and the

big end bearing shells of the remains of the calibrated wire.
Lubricate them and refit the connecting rod caps
tightening the nuts as described for measuring the
assembly clearance.

16795

Measuring the mounting clearance of big end
pins

16800

16896

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

33

VECTOR 8 ENGINES

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Base - April 2006