Assembly clearances
Cylinder - piston assy.
COUPLING BETWEEN PISTON AND ALUMINIUM CYLINDER WITH CAST IRON LINER
(125)
Name Initials Cylinder Piston Play on fitting
Coupling A 56.980 ÷ 56.987 56.933 ÷ 56.940 0.040 - 0.054
Coupling B 56.987 ÷ 56.994 56.940 ÷ 56.947 0.040 - 0.054
Coupling C 56.994 ÷ 57.001 56.947 ÷ 56.954 0.040 - 0.054
Coupling D 57.001 ÷ 57.008 56.954 ÷ 56.961 0.040 - 0.054
Coupling 1st increase A1 57.180 ÷ 57.187 57.133 ÷ 57.140 0.040 - 0.054
Coupling 1st increase B1 57.187 ÷ 57.194 57.140 ÷ 57.147 0.040 - 0.054
Coupling 1st increase C1 57.194 ÷ 57.201 57.147 ÷ 57.154 0.040 - 0.054
Coupling 1st increase D1 57.201 ÷ 57.208 57.154 ÷ 57.161 0.040 - 0.054
Coupling 2nd increase A2 57.380 ÷ 57.387 57.333 ÷ 57.340 0.040 - 0.054
Coupling 2nd increase B2 57.387 ÷ 57.394 57.340 ÷ 57.347 0.040 - 0.054
Coupling 2nd increase C2 57.394 ÷ 57.401 57.347 ÷ 57.354 0.040 - 0.054
Coupling 2nd increase D2 57.401 ÷ 57.408 57.354 ÷ 57.361 0.040 - 0.054
Coupling 3rd oversize A3 57.580 ÷ 57.587 57.533 ÷ 57.540 0.040 - 0.054
Coupling 3rd oversize B3 57.587 ÷ 57.594 57.540 ÷ 57.547 0.040 - 0.054
Coupling 3rd oversize C3 57.594 ÷ 57.601 57.547 ÷ 57.554 0.040 - 0.054
Coupling 3rd oversize D3 57.601 ÷ 57.608 57.554 ÷ 57.561 0.040 - 0.054
PISTON TO CAST IRON CYLINDER COUPLING (125)
Name
Initials Cylinder Piston Play on fitting
Coupling M 56.997 ÷ 57.004 56.944 ÷ 56.951 0.046 ÷ 0.060
Coupling N 57.004 ÷ 57.011 56.951 ÷ 56.958 0.046 ÷ 0.060
Coupling O 57.011 ÷ 57.018 56.958 ÷ 56.965 0.046 ÷ 0.060
Coupling P 57.018 ÷ 57.025 56.965 ÷ 56.972 0.046 ÷ 0.060
Coupling 1st oversize M1 57.197 ÷ 57.204 57.144 ÷ 57.151 0.046 ÷ 0.060
Coupling 1st oversize N1 57.204 ÷ 57.211 57.151 ÷ 57.158 0.046 ÷ 0.060
Coupling 1st oversize O1 57.211 ÷ 57.218 57.158 ÷ 57.165 0.046 ÷ 0.060
Coupling 1st oversize P1 57.218 ÷ 57.225 57.165 ÷ 57.172 0.046 ÷ 0.060
Coupling 2nd oversize M2 57.397 ÷ 57.404 57.344 ÷ 57.351 0.046 ÷ 0.060
Coupling 2nd oversize N2 57.404 ÷ 57.411 57.351 ÷ 57.358 0.046 ÷ 0.060
Coupling 2nd oversize O2 57.411 ÷ 57.418 57.358 ÷ 57.365 0.046 ÷ 0.060
Coupling 2nd oversize P2 57.418 ÷ 57.425 57.365 ÷ 57.372 0.046 ÷ 0.060
Coupling 3rd oversize M3 57.597 ÷ 57.604 57.544 ÷ 57.551 0.046 ÷ 0.060
Coupling 3rd oversize N3 57.604 ÷ 57.611 57.551 ÷ 57.558 0.046 ÷ 0.060
Coupling 3rd oversize O3 57.611 ÷ 57.618 57.558 ÷ 57.565 0.046 ÷ 0.060
Coupling 3rd oversize P3 57.618 ÷ 57.625 57.565 ÷ 57.572 0.046 ÷ 0.060
COUPLING BETWEEN PISTON AND CYLINDER (200)
Name
Initials Cylinder Piston Play on fitting
[p] A 71.990 ÷ 71.997 71.953 ÷ 71.960 0.030 - 0.044
[p] B 71.997 ÷ 72.004 71.960 ÷ 71.967 0.030 - 0.044
[p] C 72.004 ÷ 72.011 71.967 ÷ 71.974 0.030 - 0.044
[p] D 72.011 ÷ 72.018 71.974 ÷ 71.981 0.030 - 0.044
Piston rings
SEALING RINGS (125)
Name
Description Dimensions Initials Quantity
Compression ring 57 x 1 A 0.15 ÷ 0.30
Oil scraper ring 57x1 A 0.10 ÷ 0.30
Oil scraper ring 57x2.5 A 0.10 ÷ 0.35
Compression ring 1st
oversize
57.2 x 1 A 0.15 ÷ 0.30
Characteristics Liberty 125 - 200 4tempi
CHAR - 14
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