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一台东方红-70T型拖拉机使用不到一年,在耕地作业时连续顶断三只气门摇臂。第一次是在作业当中,出现发动机功率不足,有异常声音,打开气门室盖,发现第四缸进气门摇臂被顶断。更换后工作不到一小时,第二缸进气门摇臂被顶断。又换一只新摇臂,发动机还没起动,第二缸进气门摇臂再次被顶断。是什么原因造成气门摇臂连续三次被顶断? 经认真观察分析,确认是配气相位错乱造成的。打开正时齿轮室检查,发现惰轮轴
A Dongfanghong-70T tractor used less than a year, when working in a continuous cropped off three valve rocker arm. The first time in the operation, there is insufficient engine power, abnormal sound, open the valve cover and found that the fourth cylinder intake valve rocker arm was cut off. Less than an hour after the replacement work, the second cylinder intake valve rocker arm was cut off. Again for a new rocker, the engine has not started, the second cylinder intake valve rocker arm was cut off again. What causes the valve rocker arm to be cut off for three times in a row? After careful observation and analysis, it is confirmed that the valve phase is caused by disorder. Open the timing gear room inspection and find the idler shaft