A: ①The opening clearance of the piston ring fitted in the cylinder liner is too small. Because the gap is too small, the piston ring will be forced to die after the thermal expansion, which will cause the piston ring to break at the opening;
② The clearance of the end face of the piston ring groove is too large, which causes the piston ring to tremble in the groove after installation, which is not conducive to airtightness, and may cause the piston piston ring to break due to vibration.
③ The ring groove on the piston is heavily carbonized. When the piston ring is installed in the groove, the ring groove is not straight due to the influence of carbon deposit in the ring groove, which inevitably causes the piston ring to break due to the alternating bending action during operation.
④ The ring groove on the piston is excessively abraded and has a flare shape, which causes the piston ring to be broken due to the torsional bending effect during use;
⑤ When the carbon ash at the top of the cylinder wall is formed into a ring flange, or when the upper part of the cylinder wall is stepped due to wear, it is not removed in time, so that when the piston runs to the top dead center position, the first ring often comes into contact with the step. Impact caused by break
⑥ cylinder liner surface is not smooth or corrugated;
⑦The size and the style of the piston ring does not meet the specifications.