Kawasaki KH250 (1972-1976) Инструкция по эксплуатации онлайн [24/129] 114658

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of expansion of the piston top as compared to the skirt portion and again a difference between front rear expansion and side to side expansion Calculating these expansion differences beforehand the piston is made elliptical in shape with an inward taper toward the top Fig 60 so that under normal running conditions its shape becomes almost perfectly cylindrical and thus piston seizure due to piston expansion is averted The piston is cast of light weight high strength aluminum silicon alloy with an extremely low heat expansion coefficient and high resistance to heat and wear The piston pin is made of high strength chrome molybdenum steel and its surface is heat treated for hardening The ends of the piston pin support the piston and the center of the pin holds the small end of the connecting rod All parts are fitted in a floating type arrangement the piston pin being held by two circlips to prevent side movement The pin is offset 020 in 0 5 mm toward the inlet side of the piston to minimize piston slap that occurs near bottom dead center of the combustion cycle 1 Disassembly Cover the crankcase opening with a rag to 1 parts and dirt from falling into it Pull a ci off either end of the piston pin Pull out the piston pin and remove the piston and small end needle bearing 2 Overhaul a Piston Seizure Damage If light damage due to piston seizure or causes is found smooth the affected area o piston with fine emery cloth In the eve heavy damage the piston must be rep Attempting to repair a badly damaged p would only invite another piston seizure or c engine noise

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