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1活塞敲缸(1)故障现象。发动机转速稍高于怠速运转时,缸体上部两侧发出清脆有节奏的“铛铛”声,低温时,声音明显而清晰,温度升高后,声音减小以至消失,急加速时声音更快更响。(2)故障原因。装配不当或磨损造成活塞与汽缸的配合间隙过大、润滑不良至活塞与汽缸壁直接相碰以及个别连杆弯曲或扭曲变形等都会造成敲缸。(3)故障诊断。①在不同机温下诊断。若柴油机启动后低温运行时有敲击声,
A piston knock cylinder (1) Symptoms. Engine speed slightly higher than idle speed, the cylinder on both sides of the upper part of the crisp and rhythmic “clang ” sound, low temperature, the sound was clear and clear, the temperature rises, the sound decreases or even disappear, the sound of rapid acceleration Faster and louder (2) the cause of the malfunction. Improper assembly or wear caused by the piston and cylinder with the gap is too large, poor lubrication to piston and cylinder wall directly collide and individual connecting rod bending or distortion will cause knocking cylinder. (3) fault diagnosis. ① in different temperature diagnosis. If the engine starts with a percussive sound when it is cold,