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CAC Gasoline Engine Maintenance And Servicing Manual 35 position 19mm to the bottom skirt. unit:mm
* 480M piston should be applied on 480E ——Measure the diameter. of the hole of piston pin unit:mm 478 diameter of the piston pin hole
480 diameter. of the piston pin hole
White 20.630—20.633 White 20.630—20.633 Red 20.633—20.636 Red 20.633—20.636 Blue 20.636—20.639 Blue 20.636—20.639 ——Measure the diameter. of piston pin unit:mm 478 diameter. of the piston pin hole
480 diameter. of the piston pin hole
White 20.622—20.625 White 20.622—20.625 Red 20.625—20.628 Red 20.625—20.628 Blue 20.628—20.631 Blue 20.628—20.631 ——Measure cotter intermission of piston ring unit:mm
478 dia. of piston skirt(mm) 488 dia. of piston skirt (mm) 480E *dia. of piston skirt (mm) 1 77.19—77.20 79.91—79.92 79.915—79.925 2 77.20—77.21 79.92—79.93 79.925—89.935 3 77.21—77.22 79.93—79.94 79.935—79.945 factory 4 77.22—77.23 79.94—79.95 79.945—79.955 A 77.48—77.49 80.20—80.21 80.205—80.215 B 77.49—77.50 80.21—80.22 80.215—80.225 Factory repair C 77.50—77.51 80.22—80.23 80.225—80.235 standard 77.21—77.23 5 79.93—79.95 5 79.965—79.975 oversize 0.29 77.49—77.51 5 80.21—80.23 5 80.245—80.255 Spare parts oversize 0.5 77.71—77.73 5 80.43—80.45 5 80.465—80.475
piston ring height piston ring groove size Fit clearance first compression ring 1.60 0 -0.012
1.6 +0.06 +0.04
0.050—0.082 second track compression ring 2.0 0 -0.012
2.0 +0.06 +0.04
0.050—0.082 0.61±0.025 Oil control ring blade oil control ring 2.68±0.05 4.0 +0.03 0.01
0.01—0.23 Cast iron oil control ring 4.0 -0.015 -0.025
4.0 +0.03 +0.01
0.025—0.055 Fig.51 Fig.52 |