Engine Iveco C10/C13/C78/Cursor 13/Cursor 78. Manual - part 26

Figure 29

SELECTING THE BIG END BEARING SHELLS
(JOURNALS WITH NOMINAL DIAMETER)
There are three markings on the body of the connecting rod
in the position shown in the view from ”A”:

The number, indicating the class of diameter of the bearing
shell seat may be 1, 2 o 3.

Determine the type of big end bearing to fit on each journal
by following the indications in the table (Figure 30).

47557

VIEW FROM “A”

STD.

green

red

green

red

Class

Figure 30

Letter indicating the class of weight:

2865 to 2895 g.

2896 to 2925 g.

2926 to 2955 g.

Number indicating the selection of the diameter of the
big end bearing seat:

77.000 to 77.010 mm

77.011 to 77.020 mm

77.021 to 77.030 mm

Numbers identifying the cap-connecting rod coupling.

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

green/black

Selection of connecting rod half-bearings (rectified pins)

If pins have been rectified, the procedure described must be applied.
In this case, (for each undersizing) determine the tolerance field the new big end pins belong to, and install the half-bearings
identified according to the relative table.

-0.127

72.789
72.798

green/black

red/black

green/black

red/black

green/black

72.799
72.808

72.809
72.818

red/black =

2.074 to 2.083 mm

green/black =

2.063 to 2.073 mm

-0.254

72.671
72.680

red

green

red

green

red

2.127 to 2.137 mm

green =

2.138 to 2.147 mm

-0.508

72.417
72.426

red

green

red

green

red

green

red

green

72.427
72.437

red

green

red

green

red

2.254 to 2.264 mm

green =

2.265 to 2.274 mm

72.681
72.691

Figure 31

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

Install the half-bearings (1) on the main bearings in the
underblock (2).
Check the installation clearance between the main journals
and the relative bearings as follows:

Using the hoist and hook 99360500 (1) mount the driving
shaft (2).

After fitting the gear (1) on the crankshaft (2), heat it for

~15 minutes in an oven at temperature not higher than
180

°C.

Let them cool down after the installation.

If changing the pin (3), after fitting it on, check it protrudes
from the crankshaft as shown in the figure.

49020

47579

47578

49021

Figure 32

Figure 33

Figure 34

Figure 35

Install the oil spray nozzles (2) and have the dowel coincide
with the block hole (3).
Install the half-bearings (1) on the main bearings.

Replacing the timing control gear and the oil
pump

Check that the teeth of the gears are not damaged or worn,
otherwise remove them using the appropriate extractor.

Checking main journal installation clearance

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

End float is checked by placing a magnetic dial gauge (1) on
the crankshaft (2), as shown in the figure. If the value obtained
is higher than specified, replace the rear thrust half-bearings
and repeat this check.

- Lubricate inside screws (1) con UTDM oil, and tighten

them by dynamometric wrench to 140 Nm torque, thus
with 60º+60º angle closing, by following the diagram
below.

Place a piece of calibrated wire on the journal of the
crankshaft (2), parallel to the longitudinal axis; install the
underblock (1), by hoist and appropriate hooks.

49022

47579

47578

47588

44898

Figure 36

Figure 37

Figure 38

Figure 39

Figure 40

- Remove the under-block
The clearance between the main bearings and the journals
is obtained by comparing the calibrated wire length (2) at the
maximum deflection point, with the calibrated scale on the
coating (1) containing the calibrated wire (1).
Numbers shown on the scale specify the clearance in
coupling millimeters. If the clearance obtained is different
from the clearance required, replace the half-bearings and
repeat this check.

FRONT SIDE

Diagram showing the tightening order of the screws fixing the lower under-block to the block

Checking crankshaft end float

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

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