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Troy-Bilt 78 Benutzerhandbuch

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Crankshaft, piston and connecting rod
115
Engine specifications chart
Specification
New Min
New Max
Service Limit
in.
mm
in.
mm
in.
mm
Bore (digit 2&3 of the model number)
78
3.071
78.02
3.072
78.03
3.080
78.23
83 
3.268
83.02
3.269
83.03
3.277
83.24
90
3.544
90.02
3.544
90.03
3.553
90.26
Crank pin min. diameter
78
1.298
32.98
1.299
32.99
1.296
32.92
83
1.417
35.98
1.417
35.99
1.414
35.91
90
1.417
35.98
1.417
35.99
1.414
35.91
Piston pin min diameter
78
0.713
18.10
0.716
18.20
0.711
18.07
83
0.795
20.19
0.795
20.20
0.793
20.15
90
0.795
20.19
0.795
20.20
0.793
20.15
Connecting rod max. ID (crank side)
78
1.300
33.02
1.300
33.03
1.302
33.08
83
1.418
36.02
1.418
36.03
1.420
36.08
90
1.418
36.02
1.418
36.03
1.420
36.08
Connecting rod max. ID (piston side)
78
0.717
18.22
0.718
18.23
0.719
18.25
83
0.796
20.22
0.796
20.23
0.797
20.26
90
0.796
20.22
0.796
20.23
0.797
20.26
Connecting rod to crank pin max.  
running clearance
78
0.001
0.03
0.002
0.05
0.003
0.07
83
0.001
0.03
0.002
0.05
0.003
0.07
90
0.001
0.03
0.002
0.05
0.003
0.07
Connecting rod to crank pin max.  
side clearance
78
0.006
0.15
0.026
0.65
0.049
1.24
83
0.006
0.15
0.026
0.65
0.049
1.24
90
0.006
0.15
0.026
0.65
0.049
1.24
Crank shaft run out (max)
78
0.001
0.03
0.001
0.03
0.001
0.03
83
0.001
0.03
0.001
0.03
0.001
0.03
90
0.001
0.03
0.001
0.03
0.001
0.03
Crank shaft end play (max)
78
0.016
0.40
0.035
0.88
0.035
0.88
83
0.000
0.00
0.022
0.55
0.022
0.55
90
0.000
0.00
0.022
0.55
0.022
0.55
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