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误区一:螺栓越紧越好。汽车上用螺栓、螺母连接的紧固件很多,应保证其有足够的预紧力,但也不能拧得过紧,若拧得过紧,一方面将使连接件在外力的作用下产生永久变形;另一方面将使螺栓产生拉伸永久变形,预紧力反而下降,甚至造成滑扣或折断现象。误区二:机油越多越好。当发动机油底壳中的机油不足时,轴承与轴颈等摩擦会因机油的量少而润滑不良,加剧磨损程度,甚至引发烧瓦轴事故。其实,如果机油太多,发动机在工作时曲轴柄、连杆大端会产生剧烈的搅动,不仅增加了发动机内部功率损失,而且还会因激溅到缸壁上的机油增多,从而很容易产生烧排机油故障。因此,发动机油底壳中的机油控制在机油尺的上、下刻线之间为好。
Misunderstanding one: the tighter and better bolts. Car with bolts, nuts, fasteners connected a lot, should ensure that they have sufficient preload, but can not be too tight, if too tight, on the one hand will make the connection under the action of external force permanent Deformation; the other hand, the bolt will produce permanent tensile deformation, preload but decreased, or even cause the slider or broken phenomenon. Myth: the more oil the better. When the oil in the engine oil sump is insufficient, the bearing and journal friction will be poorly lubricated due to the small amount of oil, exacerbating the degree of wear, and even triggering the accident of burning the tile shaft. In fact, if too much oil, the engine crankshaft handle at the work, the big end of the connecting rod will produce violent agitation, not only increases the internal power loss of the engine, but also due to the splash of oil on the cylinder wall increased, which is easy to produce Burning row of oil failure. Therefore, the oil in the engine oil pan is controlled between the upper and lower ruler of the oil dipstick.