一台北京BJ130型汽车大修后行驶不足200Km.发动机便产生一种金属敲击异响。其响声在发动机的前中部较明显;响声与温度无关,但随转速而变化,发动机在怠速和低中速运转时响声较大,而高速运转时,响反而减弱或消失。 一般按常规诊断此异响的部位、可断定为正时齿轮处。常见正时齿轮响有两种情况:一种是正时 A Beijing BJ130 overhauled vehicle driving less than 200Km. The engine will produce a metal percussion noise. The sound of the engine in the front of the more obvious; sound and temperature has nothing to do, but with the speed and change, the engine at idle speed and low speed operation, louder, and high speed operation, the ring instead weakened or disappeared. According to the general diagnosis of this part of the abnormal sound, can be concluded as a timing gear Department. There are two common cases of timing gear ring: one is timing