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02-31 1130-33 Functions ▶ Piston transfers the combustion energy from engine to connecting rod. C. Snap ring Locks the piston pin. - A. Piston ring #1 ring (Top ring) : Prevents the high pressurized combustion gas from leaking into crank chamber, and prevents the engine oil getting into combustion chamber. #2 ring: Scrapes the engine oil on the cylinder bore, and prevents the leaked combustion gas from #1 ring from leaking into the crank chamber. Oil ring: Scrapes the engine oil on the cylinder bore. - - - B. Piston pin Connects the piston the connecting rod, and transfers the linear movement of piston to connecting rod to convert it to rotating energy. - Piston ring ▶ Piston ring end gap (mm) #1 end gap: 0.170 ~ 0.320 Piston ring side clearance (mm) #1 groove: 0.040 ~ 0.080 |