平时我们在维修和保养柴油机时,有些机手反映气门和气门座不耐用,一般工作300～500小时就严重磨损了,气门和气门座接触锥面线宽1.8～2毫米,气门下陷118～2.5毫米,出现气门关闭不严,发动机起动困难,功率下降。造成气门和气门座早期磨损的原因,我们分析有以下几点: 1.农用柴油机工作环境较脏,加上机手对空气滤清器保养差,致使没有经过滤清的空气进入气缸,加 Normally when we are repairing and maintaining a diesel engine, some of the handguides reflect that the valve and the valve seat are not durable. Generally, they work for 300 to 500 hours and are seriously worn. The contact width between the valve and the valve seat is 1.8 to 2 mm and the valve sags 118 to 2.5 Mm, there lax valve closure, the engine start difficult, the power down. Cause valve and valve seat early wear and tear of the reasons, we analyze the following points: 1. Agricultural Diesel engine working environment is dirty, together with the hands of the poor maintenance of the air filter, resulting in no filtered air into the cylinder, plus