一台4125A型柴油机,启动时只听见排气管处几声“嘭嘭”的响声,就是启动不了,经检查柴油机的压缩、配气、供油系都正常,最后发现配气凸轮轴与凸轮轴齿配合的平键有松动现象。由于平键松动,凸轮轴齿与凸轮轴的位置发生改变,配气相位也随着改变,造成柴油机启动困难,更换一个合格的平键后,柴油机顺利启 A 4125A diesel engine, start only hear the exhaust pipe at the sound “嘭 嘭 ” sound is not activated, after checking the diesel compression, gas distribution, fuel supply system is normal, and finally found that the distribution of camshaft With the camshaft teeth with flat key loose phenomenon. Due to flat key loose, camshaft tooth and camshaft position changes, with the gas phase is also changed, resulting in difficult to start the diesel engine, replace a qualified flat key, the diesel engine smoothly Kai