Engine Iveco C10/C13/C78/Cursor 13/Cursor 78. Manual — part 104
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
89.970 to 89.979
89.980 to 89.989
89.990 to 90.000
CLASS
CRANKPIN
NOMINAL DIAMETER
99.970 to 99.979
99.980 to 99.989
99.990 to 100.000
CLASS
MAIN JOURNALS
NOMINAL DIAMETER
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
21
Selecting the main bearing shells (Journals with nominal diameter)
After reading off the data, for each of the main journals, on the crankcase and crankshaft, you choose the type of bearing shells
to use according to the following table:
STD.
1
2
3
1
2
3
green
green
red
red
red
red
green
green
green
green
red
red
green
green
green
green
green
green
Figure 27
22
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
green/black
SELECTING THE MAIN BEARING SHELLS (GROUND JOURNALS)
If the journals have been ground, the procedure described so far cannot be applied.
In this case, it is necessary to check that the new diameter of the journals is as shown in the table and to mount the only type
of bearing shell envisaged for the relevant undersizing.
-0.127
1
2
3
99.843
99.852
green/black
green/black
green/black
green/black
green/black
green/black
red/black
red/black
green/black
green/black
green/black
red/black
red/black
red/black
red/black
green/black
green/black
99.853
99.862
99.863
99.873
1
2
3
red/black =
3.173 to 3183 mm
green/black =
3.184 to 3.193 mm
-0.254
1
2
3
99.726
99.746
red
red
red
red
red
red
red =
3.237 to 3.247 mm
-0.508
1
2
3
99.468
99.508
red
red
red
red
red
red
red =
3.364 to 3.374 mm
Figure 28
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
23
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 indicated as ”A”:
Letter indicating the class of weight:
A
=
4741 to 4780 g.
B
=
4781 to 4820 g.
C
=
4821 to 4860 g.
Number indicating the selection of the diameter of the
big end bearing seat:
1
=
94.000 to 94.010 mm
2
=
94.011 to 94.020 mm
3
=
94.021 to 94.030 mm
Numbers identifying the cap-connecting rod coupling.
1
2
3
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.
1
2
3
1
2
3
green
green
red
red
red
red
red
red
green
green
green
green
green
green
green
green
green
green
CLASS
Figure 30
24
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
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