一颗放油螺丝竟然导致变速箱大修？实际上修理厂人员都知道，发动机和变速箱上螺丝必须先用手拧上几圈，再用扳手或风炮紧固。那么这辆车的变速箱就是因为把螺丝拧滑丝了，随便找了螺丝代替，结果导致变速箱大修。下面
山东变速箱维修人员为您分析下这个问题吧。
How could a drain screw lead to gearbox overhaul? In fact, the repair shop personnel all know that the screws on the engine and gearbox must be tightened by hand for several turns before being tightened with a wrench or air gun. Then the gearbox of this car was replaced by screws because of the screw slipping, which led to the overhaul of the gearbox. Next, Shandong transmission maintenance personnel will analyze this problem for you.
手动变速箱油一般是6-8W公里更换，更换方式也很简单，拆下放油螺丝就可以了。今天这位车主是外地的，出发之前在当地一家修理厂把全车的油液全换了，结果在倒车的时候，发现车前地面上有一摊油。趴车底一看变速箱和发动机之间全是油。
The manual transmission oil is generally replaced at 6-8W km. The replacement method is also very simple. Just remove the oil drain screw. Today, the car owner was from another place. Before leaving, he changed all the oil in the car at a local repair shop. When reversing, he found a pool of oil on the ground in front of the car. Get under the car and look at the oil between the transmission and the engine.
闻着味道是变速箱油，因为变速箱油发臭。这种情况一般都是变速箱一轴油封密封失效。但是当我们拆下变速箱后，发现我判断错了。看下图，有个钢珠把壳体撑裂了。这个时候我们判断可能是轴承内的钢珠脱落，但拆开变速箱后~~又发现我们判断错了。
It smells like transmission oil, because it stinks. This situation is generally caused by the failure of the oil seal of the first shaft of the transmission. But when we removed the gearbox, I found that I was wrong. As shown in the figure below, a steel ball cracked the shell. At this time, we judged that the steel ball in the bearing might fall off, but after disassembling the gearbox, we found that we were wrong.
红色圆圈是原车的倒挡开关。两个绿色圆圈是导致壳体碎的元凶，油底壳放油螺丝，为什么是两部分呢？为什么这个油底壳放油螺丝会导致壳体破碎？
The red circle is the reverse gear switch of the original vehicle. Two green circles are the main culprits that cause the shell to break. Why are the oil pan drain screws two parts? Why does the oil pan drain screw cause the shell to break?
一原因：这不是原车的放油螺丝，而是一个倒挡开关。大家都知道到挡开关上都会有一个钢珠，上图两个绿色圆圈一个是钢珠一个是倒挡开关。我们分析是原车的放油螺丝拧滑丝了或者丢了找不着了，因为放油螺丝直径都比较粗，这种螺丝不好找，结果修理厂随便找了个粗细一样的倒挡开关给装了上去，也没告知客户。
One reason: this is not the oil drain screw of the original vehicle, but a reverse gear switch. As we all know, there will be a steel ball on the shift switch. The two green circles in the figure above are the steel ball and the reverse switch. We analyzed that the oil drain screw of the original car had slipped or was lost. Because the diameter of the oil drain screw was relatively thick, it was difficult to find this kind of screw. As a result, the repair shop randomly found a reverse gear switch of the same thickness and installed it, but didn't tell the customer.
二原因：倒挡开关长度要比原车放油螺丝长，而差速器大盘齿距离油底壳只有不到1cm的距离，过长的倒挡开关直接顶到了差速器大盘齿上。上图两个绿色圆圈一个是钢珠一个是倒挡开关
The second reason is that the length of the reverse gear switch is longer than the oil drain screw of the original vehicle, and the distance between the large plate gear of the differential and the oil pan is less than 1 cm, and the long reverse gear switch is directly pushed onto the large plate gear of the differential. Two green circles in the figure above, one is steel ball and the other is reverse gear switch
安装之前需要用汽油清洗壳体和齿轮。圆圈部分是放油螺丝口，可以看到距离大盘齿非常近。倒挡开关顶部的钢珠被大盘齿打掉，被甩到大盘齿和变速箱壳体之间，因为齿轮坚硬，变速箱壳体是铝的，导致壳体被顶裂后，钢珠死死的卡在壳体上，这也是为什么变速箱并没有异响的原因。
Clean the housing and gear with gasoline before installation. The circle part is the oil drain screw hole, which can be seen very close to the large disk gear. The steel ball on the top of the reverse gear switch was knocked off by the big plate gear and thrown between the big plate gear and the gearbox housing. Because the gear is hard and the gearbox housing is aluminum, the steel ball stuck on the housing after the housing was jacked, which is why the gearbox has no abnormal noise.
The above is the relevant answer to the question. I hope to help you. Of course, if you have any doubts or needs about this, you can come to our website at any time http://www.jnbsx.com Consult and understand!
