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关于2002-2009宝马745/750一二档换挡顿挫故障成因分析及排除

(2016-10-30 21:53:42) 下一个

Driveshaft bushing/Drive shaft coupling/Rubber driveshaft coupler/Giubo joint/Flex disc, whatever you name them they are the same!

学个修车容易吗?中文都还搞不清咋讲,英文还那么多称谓!

Flex Disc

flex disc also known as coupling, Giubo, Guibo, Flex Joint is a flexible reinforced rubber disc used on vehicles using rear wheel driveshaft or all-wheel drive.

The flex disc has 6 bolt holes sleeved with metal guides, three mounts to the driveshaft and the other three to the moving components flange.

Flex disc transfer all the torque to the driveshaft therefore it has to be of the highest grade material

 

The flex disc designed to allow some angular misalignment between the Driveshaft and the transmission, transfer case or Differential.

Cuts off transmission vibration and sounds, reducing stress on the driveshaft

Mostly used in vehicles such as BMW, MercedesPontiac GTOCadillac CTSVW and Porsche

这个连接drive shaft两端【有的只有变速箱体与driveshaft连接一端有】合成橡胶垫在有些车上是被包裹着,无法在不拆卸排气管隔热瓦等主要部件的情况下检测,而其寿命和驾驶方式及驾驶里程有很多关系。

成因:长期使用的正常磨损失效或老化损伤。

症状:低档位换挡顿挫感,后期会伴随清晰的金属碰撞声,初期很容易被误判为变速箱VB的挡位电磁阀故障及内部油封开裂或变形导致的油压不稳,但并没有相应故障码。

解决方案:更换橡胶Flex Disc,这个应该属于时间里程易损的失效部件,从驾驶的舒适性来说应该定期定里程更换。

一个维修实例:病程发展,险被误诊,冒险一搏,柳暗花明

So today i sorted the scary transmission clunks and thuds that gave me mini heart attacks. Im pretty sure im not the only one here who has experienced this with their E65/66

Problem started around 2 or 3 months ago where i heard and felt the kick from 2nd to 1st gear while braking. It wasnt that loud at first but gradually became worrying. I researched this forum a lot. Some had issues with transmission itself, others the valve body or mechatroniks. 

At one point i was about to order the mechatroniks valves set from the US cause i didnt wanna end up with a broken transmission. I also took it to a transmission specialist who told me that he already has a refurbished valve body. But again this fix was no less than a USD 1000 and warranty of this refurbished valve body was for a week only. 

I wanted to have a second opinion on this and the other mechanic totally refuted the idea that this problem in anyway related to Guibo joint. According to him its definitely the mechatroniks and even this solution has NO guarantee that it will last for a longer period of time. He said, he has tried fixing two (E65/66) with the same problem by replacing valve bodies (new) and one car keeps coming back for the similar problem and the other one is fixed. This made me really worried as the whole new transmission costs a fortune and im not prepared to pay for all that. 

I still wanted to take the chance on Guibo joint. I mean the fix was a lot cheaper and im not losing anything. Even if the transmission is bad, i'd still be replacing something that needs to be replaced anyway given the mileage on my car. I read the DIYsavecash (the forum member here) posts and watched the video he made on this issue on youtube. Took my car to the mechanic who charged me less than a $100 for the job and replaced Guibo joint in one hour. Fingers crossed 

Tell you what, the ride after that is seamless. Its like im driving a new car. No nasty clunks, no kicks while stopping. No P to D or R jerks. Nothing!!! 
Im so much relieved and seems like a huge burden is off my shoulders. 
Some pictures for the forum to know the culprit here 
Old Guibo joint which in my opinion came with the car from the factory. (Has BMW OEM markings on it) 



Please notice the play from closed gap to open. I had to turn the back wheel to hear and see how bad it was. 

Closed gap 



Open gap that caused the play between driveshaft and the transmission 



New Guibo joint by Febi Germany. Part# on the sticker for the reference for E65/66



Installation directions. 



Again i tried to really test how bad old part was broken and as you can see the metal (if i struggled harder with it) would have came out of the the rubber. 

 

Im a happy man today. 

难以置信居然可以做到100刀手工费,你知道这是多少活儿吗!如果我要能找到200加刀以内的手工车铺我是绝不自己干!

DIY - guibo joint / flex disc / universal joint replacement procedure thread

卸防护底板

卸排气管

卸隔热瓦

卸drive shaft [可选】

卸 flex disc

没什么技术难度,但考验耐心和上肢体力,如果没有lift的话

这是另一种变速箱与drive shaft的连接,开过九十年代初期GM SIERRA 1500就是这种,会漏变速箱液,也会有停车顿挫感。

After coming to a stop it feels like someone hits you from the rear

传动轴汽车万向节日常故障诊断与排除?

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