Fig. 22 - Fitting bushing into the con-rod small
end.
Fig. 23 - Checking con-rod for wear.
Fig. 24 - Pulling out/driving in con-rod bushing.
Fig. 25 - Checking the diameter of the connecting
rod clamp bolts.
Connecting rods - connecting rod bearings and
bushings (Fig. 26)
Checking connecting rod axis parallelism
(using no. 5.9030.651.4 special tool)
Place the connecting rod on the special tool and mount the comparator
by loading the feeler 1 mm against the gudgeon pin.
Move the connecting rod from right to left and reset the comparator to
zero when the comparator hand indicates the maximum reading. Remove
the connecting rod from the tool and replace it after a 180° rotation along
its longitudinal axis.
Repeat this operation and note the difference in reading compared with
the previous taken. If the difference is above the specified tolerances, the
rod shall be straightened by hand press .
Checking connecting rod bushing and bearings
Check connecting rod bushings and bearings for scoring or scuffing.
Wear amount should not exceed specifications, otherwise they must be
replaced.
After fitting the bushing, check that the diameter is as specified in figure
22.
Checking connecting rod weight
The difference in weight between one engine connecting rod and another
must never exceed 20 gr.
Installing connecting rods
The screws are to be tightened progessively to 1 kgm (9.8 Nm) torque
and subsequently to 3 kgm (29.5 Nm) torque then using no. 5.9030.640.0
tool furtherly tighten each single screw to an angle of 90° 1’
If these bolts are to be reused, check that the difference between the
maximum and minimum diameter measured at the part denoted A (Fig
25) is less than 0,1 mm. If not, the bolt must be replaced.
Fig. 26 - Checking con-rod axis parallelism.
Ø machining Ø max wear
connecting rod bearing inside diameter mm 63,500
+ 0,075
+ 0,035
63,620
1st undersize mm 63,250
+ 0,075
+ 0,035
63,370
2st undersize mm 63,000
+ 0,075
+ 0,035
63,120
connecting rod bushing inside diameter mm 35
+ 0,025
+ 0,015
35,060
maximum misalignment of the connecting
rod smoll end axis
(measured at 49 mm from con-rod centre line) mm 0,05
engine
crankshaft
12
1
34
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