Italjet Dragster 2022, Maintenance Manual

Page: 142 / 165

Maximum piston / cylinder coupling clearance
after use (125/200)
- top ring: 0.075 mm (0.0029 in)
- middle ring: 0.065 mm (0.0025 in)
- oil scraper: 0.25 mm (0.0098 in)
Standard piston / cylinder coupling clearance
(125/200)
- top ring: +0.03 / 0.062 mm (0.0012 / 0.0024 in)
- middle ring: +0.02 / 0.052 mm (0.0008 / 0.0020 in)
- oil scraper: +0.01 / 0.19 mm (0.0004 / 0.007480 in)
Inspecting the cylinder
•
Using a bore meter, measure the cyl-
inder inside diameter at three different
points according to the directions
shown in the figure.
•
Check that the coupling surface with
the head is not worn or misshapen.
CAUTION
THE MARKING IS LOCATED ON THE PISTON CROWN.
Characteristic
Maximum run-out allowed:
0.05 mm
C
YLINDER
-
PISTON COUPLING CLEARANCE
125
CM
³
Coupling categories with cast-iron cylinder
NAME ABBREVIA
TION
CYLINDER PISTON FITTING
CLEARANCE
min max min max min max
Cylinder/Piston M 58,010 58,017 57,963 57,970 0,040 0,054
Cylinder/Piston N 58,017 58,024 57,970 57,977 0,040 0,054
Cylinder/Piston O 58,024 58,031 57,977 57,984 0,040 0,054
Cylinder/Piston P 58,031 58,038 57,984 57,991 0,040 0,054
C
YLINDER
-
PISTON COUPLING CLEARANCE
200
CM
³
Coupling categories with cast-iron cylinder
NAME ABBREVIA
TION
CYLINDER PISTON FITTING
CLEARANCE
min max min max min max
Cylinder/Piston M 63,010 63,017 62,958 62,965 0,045 0,059
Cylinder/Piston N 63,017 63,024 62,965 62,972 0,045 0,059
Cylinder/Piston O 63,024 63,031 62,972 62,979 0,045 0,059
Cylinder/Piston P 63,031 63,038 62,979 62,986 0,045 0,059
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