Iveco Stralis AT/AD. Manual - part 17

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 69 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 69 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 69 at bottom).

Figure 69

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

ENGINE F2B

TRALIS

AT/AD

Base - January 2003

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 70

ENGINE F2B

TRALIS

AT/AD

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 =

mm 3.063 to 3.073

green/black =

mm 3.063 to 3.073

-0.254

82,666
82,686

red

red =

mm 3.127 to 3.137

-0.508

82.412
82.432

red

red =

mm 3.254 to 3.264

Figure 71

ENGINE F2B

TRALIS

AT/AD

Base - January 2003

Figure 72

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 73).

47557

VIEW FROM “A”

STD.

green

red

green

red

Class

Figure 73

Letter indicating the class of weight:

2890 to 2920 g.

2921 to 2950 g.

2951 to 2980 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.

ENGINE F2B

TRALIS

AT/AD

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