Engine Iveco C10/C13/C78/Cursor 13/Cursor 78. Manual - part 25

To obtain the required assembly clearances, the main and big end bearing shells need to be selected as described
hereunder.

This operation makes it possible to identify the most suitable bearing shells for each of the journals (the bearing shells, if necessary,
can have different classes from one journal to another).

red

red/black

green

green/black

STD

2.000 to 2.010

2.011 to 2.020

+0.127

2.063 to 2.073

2.074 to 2.083

+0.254

2.127 to 2.137

2.138 to 2.147

+0.508

2.254 to 2.264

2.265 to 2.274

Depending on the thickness, the bearing shells are selected
in classes of tolerance marked by a coloured sign (red-green
— red/black — green/black).

The following tables give the specifications of the main and
big end bearing shells available as spares in the standard sizes
(STD) and in the permissible oversizes (+0.127, +0.254,
+0.508).

* Fitted in production only and not supplied as spares

Figure 25

yellow*

yellow/black*

2.021 to 2.030

red

red/black

green

green/black

STD

3.000 to 3.010

3.011 to 3.020

+0.127

3.063 to 3.073

3.074 to 3.083

+0.254

3.127 to 3.137

+0.508

2.254 to 3.264

yellow*

yellow/black*

3.021 to 3.030

2.084 to 2.093

3.084 to 3.093

Selecting the main and big end bearing shells

NOTE

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

DEFINING THE CLASS OF DIAMETER OF THE MAIN JOURNALS AND CRANKPINS (Journals with nominal diameter)
Main journals and crankpins: determining the class of diameter of the journals.
Three sets of numbers are marked on the crankshaft in the position shown by the arrow (Figure 26 at top):

- The first number, of five digits, is the part number of the shaft.

- Under this number, on the left, a set of six digits refers to the crankpins and is preceded by a single digit showing the status

of the journals (1 = STD, 2 = -0.127), the other six digits, taken singly, give the class of diameter of each of the crankpins
they refer to (Figure 26 at top).

- The set of seven digits, on the right, refers to the main journals and is preceded by a single digit: the single digit shows the

status of the journals (1 = STD, 2 = -0.127), the other seven digits, taken singly, give the class of diameter of each of the
main journals they refer to (Figure 26 at bottom).

Figure 26

72.915 to 72.924

72.925 to 72.934

72.935 to 72.945

CLASS

CRANKPIN

NOMINAL DIAMETER

82.910 to 82.919

82.920 to 82.929

82.930 to 82.940

CLASS

MAIN JOURNALS

NOMINAL DIAMETER

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

Selection of main half-bearings (nominal diameter pins)

After detecting, for each journal, the necessary data on block and crankshaft, select the type of half-bearings to be used, in
compliance with the following table:

STD.

green

red

green

red

green

red

Figure 27

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

green/black

Selection of main half-bearings (rectified pins)

If the journals have been rectified, the procedure described cannot be applied.
In this case, make sure that the new diameter of the journals is as specified on the table and install the only half-bearing type
required for this undersizing.

-0.127

82.784
82.793

green/black

red/black

green/black

red/black

82.794
82.803

82.804
82.814

red/black =

3.063 to 3.073 mm

green/black =

3.063 to 3.073 mm

-0.254

82,666
82,686

red

red =

3.127 to 3.137 mm

-0.508

82.412
82.432

red

red =

3.254 to 3.264 mm

Figure 28

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

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