Engines Iveco C87 / Cursor 87. Manual — part 26
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
1.994 to 2.002
2.002 to 2.010
+0.127
2.057 to 2.065
2.065 to 2.073
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*
2.010 to 2.018
red
red/black
green
green/black
STD
2.968 to 2.978
2.978 to 2.988
+0.127
3.031 to 3.041
3.041 to 3.051
yellow*
yellow/black*
2.988 to 2.998
2.073 to 2.081
3.051 to 3061
NOTE
Selecting the main and big end bearing shells
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
19
F2C CURSOR ENGINES
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
81.915 to 81.925
81.925 to 81.935
81.935 to 81.945
CLASS
CRANKPIN
NOMINAL DIAMETER
92.970 to 92.980
92.980 to 92.990
92.990 to 93.000
CLASS
MAIN JOURNALS
NOMINAL DIAMETER
20
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F2C CURSOR ENGINES
Base - June 2007
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.
1
2
3
1
2
3
green
green
red
green
red
red
green
yellow
green
green
red
green
yellow
yellow
green
yellow
green
green
Figure 27
114048
114055
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
21
F2C CURSOR ENGINES
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
1
2
3
92.843
92.853
green/black
green/black
green/black
yellow/black
yellow/black
yellow/black
red/black
green/black
green/black
green/black
yellow/black
red/black
red/black
red/black
green/black
green/black
green/black
92.853
92.863
92.863
92.872
1
2
3
red/black =
mm 3.031 to 3.041
green/black =
mm 3.041 to 3.051
Figure 28
green/black =
mm 3.0513 to 3.061
22
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F2C CURSOR ENGINES
Base - June 2007
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