发动机使用较长时间后,冷却系会产生水垢,通常在进行三级保养时,对冷却系进行彻底清洗。清洗方法如下:(1)起动发动机,空车运转,待水温升到40～60℃之后,停车趁热放出冷却水。(2)将6公斤热水、0.5公斤烧碱(苛性钠)、0.1公斤煤油的混合液注入水箱。(3)起动发动机,空车中速运转5～10分钟,停车放置8～10小时。(4)再起动发动机,用调速手柄控制发动机转速,使其时速时快时慢,利用水流冲击使水垢或沉淀物悬浮,运转5～10分钟,停车放出清洗 After the engine is used for a long time, the cooling system will produce scale, usually in the three maintenance, the cooling system thoroughly cleaned. Cleaning method is as follows: (1) start the engine, empty car operation, until the water temperature rose to 40 ~ 60 ℃, the release of hot water while parking. (2) 6 kg of hot water, 0.5 kg of caustic soda (caustic soda), 0.1 kg of kerosene mixture into the tank. (3) start the engine, empty car speed 5 to 10 minutes, parking place 8 to 10 hours. (4) restart the engine, speed control handle with the engine speed, fast time when it slows down, the use of water impact scale or sediment suspension, running for 5 to 10 minutes, the parking release cleaning