一台小松PC220-6型履带式挖掘机,工作中排气管间歇性冒白烟。根据经验判断,柴油机冒白烟的原因主要是,喷油正时过晚;喷油雾化不良、喷油嘴喷油时有滴油现象;燃油中有水或有水进入燃烧室;燃油在过冷的燃烧室内,因着火不稳定而引起燃烧不完全;辅助启动装置使用不当,使启动燃油聚集在机体内;进气道 A Komatsu PC220-6 crawler excavator, working exhaust pipe intermittently take white smoke. Judging from experience, diesel engines take the main cause of white smoke, fuel injection timing is too late; spray atomization is poor, injection nozzle drip oil phenomenon; fuel in water or water into the combustion chamber; fuel at Undercooling the combustion chamber, due to fire instability caused by incomplete combustion; auxiliary starter improper use, so that the start-up fuel gathered in the body; intake port