【导读】
说起维修中经历的骗局,相信很多养车人都经历过。以次充好、小问题大维修、以假乱真、以换代修,都是很多4S店善用的伎俩,为何总是屡试不爽,车主频频中招呢?其实就是抓住车主不懂汽车维修的心理,大做文章。今天这个案例讲讲发电机不发电而一连贯的以换代修过程,算是给广大车主敲个警钟。
一、案例回放
该车主的车辆故障是发电机不发电。表现上来看,就是当发动机运转后,电瓶充电指示灯闪烁,并且发电机伴有嗡嗡异响。车主前往4S店后,被告知该车发电机损坏需要更换。由于车主不懂,也就接受了更换方案。虽然故障得到解决,但也花费了上千元维修费。车主将旧件带走后,找到了专业人员进行分解,原来仅需几十元就能搞定,并无需更换发电机。主要原因第一发电机轴承磨损,更换一个市值30元。转子导电环锈蚀,砂纸打磨市值3元钱。
二、发电机的组成
1、壳体
2、转子
3、定子
4、电压调节器
三、发电机的分解
1、锤子敲击是错误方
式将发电机壳体固定螺栓拆卸后,你会发现发电机壳体并不会轻易的分开。此时我们不要使用锤子使劲对壳体进行敲击,这样很容易导致发电机壳体的损坏。
2、正确分解壳体方式
拆卸螺栓后,我们可以将发电机放置在胶垫、枕木等物体上,进行轻轻的震动。带壳体结合处出现缝隙以后,左右手晃动壳体基本就可以拆卸了。
四、如何判定发电机故障
1、电瓶灯闪烁的主要原因
拆卸发电机以后,我们看到了转子的导电环由于车主长期涉水以及高压冲洗发动机舱,导致导电环出现了锈蚀等情况。出现了导电接触不良的问题。因此出现了发电量不稳定,时发电时不发电的故障现象。
2、转子磨损
在观察中,我们看到了转子的外壁出现了磨损情况,也就是我们所说的“扫堂”。当发电机运转后异响也是来源于此。
3、定子磨损
转子在旋转过程中,会与定子存在一定间隙,两者是不会有干涉接触问题的。如果这两个物体出现接触,势必会产生异响。这也是发电机轴承损坏松旷所引起的故障。
4、电压调节器
电压调节器是负责将发电量固定在一个合理范围内的,也就是14-15V之间。如果电压调节器出现故障会出现发电量高或者发电量低,甚至不发电的问题。如果在处理完导电环以后,依然不发电,就很可能是电压调节器故障。
五、如何处理发电机不发电
1、打磨导电环
当发电量不稳定时,我们在拆卸发电机后发现导电环存在腐蚀等情况后,可以采用砂纸对导电环进行打磨。使用细砂纸对其表面进行打磨即可。
2、更换发电机轴承
轴承都是有国际统一尺寸标号的。发电机轴承也不例外。拆卸发电机以后,我们可以通过旧轴承到市面上的轴承专卖店购买到相同型号的轴承。一般一个轴承价格也就在30-50元,因此是完全不用更换发电机的。
写在最后:
通过以上案例,可能你会感觉故障十分繁琐,自己并不容易处理。其实这篇文章的主要目的就是让广大车主了解发电机出现的一些故障现象和解决的方法。当你的爱车出现这种情况以后,不妨找到一个汽车电器修理小店,可能几十元就能搞定,免去你到4S店被以换代修,你学会了吗?
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/42483.html
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