工程机械用的柴油发动机工作负荷大，多数采用水循环冷却系统。在施工中不少新操作手和修理工由于缺乏经验，加之使用、保养不当，常常造成发动机气缸垫烧损。由于冷却水道距气缸口很近，气缸垫损坏后发动机燃烧所产生的废气会沿着气缸垫的缝隙进入冷却水道。柴油在燃烧过程中 Diesel engine construction machinery work load, the majority of water circulation cooling system. In the construction of many new operators and mechanics due to lack of experience, combined with the use, improper maintenance, often causing the engine cylinder liner burnout. As the cooling water channel is close to the cylinder port, the exhaust gas generated by the engine combustion after the cylinder pad is damaged will enter the cooling water channel along the gap of the cylinder pad. Diesel in the combustion process