气缸上部发出有节奏的“口当口当”声 ,且随转速的提高而增大 ,转速下降而减少。这种敲击声俗称“敲缸”。而柴油机在作业过程中出现敲缸的症状是 :从中速到低速 ,会发出较重的敲缸声 ,排气管冒黑烟 ,并时有放炮声或向外喷火 ,发动机机体过热。产生敲缸的原因主要有 :1 供油时 The upper part of the cylinder emits a rhythmic “mouth-opening” sound, which increases with the increase of the rotational speed and decreases with the decrease of the rotational speed. This percussion commonly known as “knock cylinder.” The diesel engine in the operation process knocking cylinder symptoms are: from medium to low speed, will be issued a heavy knocking cylinder sound, exhaust pipe black smoke, and sometimes blasting sound or outward flame, the engine body overheating. Knocking the main reasons are: 1 oil supply