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实例一 故障现象:一辆新五羊本田WY125型摩托车,突然出现挡位变换困难,变速杆动作沉重、行程减小,变速箱内有异常响声,容易出现空挡的现象。对该车进行行驶试验时,除上述现象外,发动机怠速工作时易熄火,温度升高快,无论空载与否有加载沉重感。检查发动机机油量发现:机油平面过多,高于机油尺上刻线;放出发动机内多余的机油时,汽油味很浓,放出的机油很稀。经鉴定,发动机机油中有汽油。 故障分析与排除:根据五羊本田WY125型摩托车发动机的结构特点,发动机机油中进入汽油时必须具备两个前提条件:即化油器浮子室溢油管被堵塞,浮子
Example A fault phenomenon: a new Wuyang Honda WY125 motorcycle, a sudden shift gear difficult, heavy gear movements, stroke decreases, the transmission has an abnormal noise, prone to neutral phenomenon. Driving test of the car, in addition to the above phenomenon, the engine idle speed easy to turn off when the temperature rises quickly, no matter whether the load or not load heavy feeling. Check the engine oil volume found: too much oil plane, higher than the ruler on the engraved line; release excess engine oil, the gas is very strong smell, release the oil is very thin. Identified, the engine oil in gasoline. Failure Analysis and Elimination: According to the structural characteristics of Wuyang Honda WY125 motorcycle engine, the engine oil into the gasoline must have two preconditions: the carburetor float chamber overflow pipe is blocked, the float