Cylinder - Puch 1980-1981 Maintenance Manual

CYLINDER
Piston/cylinder clearance limits
ALU-Cyl.: Min. .0008 in. (0,020 mm)
Max. .0016 in. (0,040 mm)
Hi-Tor.-Cyl.: M i n . .0014 in. (0,037 mm)
Max. .0020 in. (0,052 mm)
M A G N U M - C y l . : M i n . .0014 in. (0.036 mm)
Max. .0020 in. (0.052 mm)
Ring gap
.006 - .012 in.
0,15 - 0,30 mm
(for all models)
NOTE: When boring a cylinder for 0/size piston, note piston
sort type number, and refer to respective sorting table and
add .25 mm to cylinder sorting (diameter) size.
EXAMPLE: 0/size piston sorting group 22, cylinder diameter
required 1.7462 - 1.7464 inches (38,256 - 38,261 mm).
Measuring the cylinder
The cylinder bore is measured with a bore gauge and a bore-
measuring adapter (both items are commercially available).
Measuring procedure
Adjust bore gauge by means of the stop measure to the no-
minal bore diameter.
The bore must be measured at six positions, once parallel
with and once diametrically opposed the wrist pin at the
three positions indicated in fig. The specified temperature
of 68° F (20° C) is important if reliable results are to be
obtained. The lowest positon of the pointer indicates the
bore diameter.
Maximum permissible ovality of cylinders:
ALU-Cylinder .0004 in. (0,01 mm)
Hl-Torque-Cyl. .0012 in. (0,03 mm)
M A G N U M - C y l . .0012 in. (0,03 mm)
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