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本帖最后由 Simonjo 于 2021-12-13 11:17 编辑
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The vehicle would not start. It has 78,328 km on the odometer.
Initial investigations into the non-start issue found the cam shafts not turning when cranking the vehicle.
We suspected that it was a timing chain issue, but needed to remove the engine cam cover to inspect.
The additional time to remove the cam cover was authorised by yourself, and the inspection continued.
Dealer发现启动机未能带动正时凸轮，因此拆开正时罩检查。
After removal of the cam cover, our Technician was able to confirm that the timing chain had failed. We also saw that the camshaft carrier was cracked, which is a strong indication that the cylinder head valves have made contact with the pistons, likely causing considerable engine damage.
发动机丢了正时，活塞怼了缸头和气阀，正时凸轮把底下的基座都打裂了，至少是缸头需要换了，活塞头、活塞环、连杆、曲轴他们没有看，我觉得也没有看的必要，有问题的可能性很大，即使目测没问题，敲过缸的东西寿命也不会长，甚至有安全隐患，换发动机是非常正确的选择。
The major contributing cause of the timing chain failure, is neglect with regards to the servicing schedule, namely a history of very late or non-existent oil changes/inspections.
From data taken directly from your vehicle, in April 2019 when visiting **** BMW, the oil service that was due in January of 2019, was overdue by 16,000km.
这里是你上次该换油的时候，多开了一万六千公里才去做的保养。宝马的CBS是最长两年或者三万公里做一次换油，超了一万6，你这次保养距离上次估计是4-5万公里。
The above is current data taken from your vehicle upon arrival with us at ** BMW at the end of November 2021, showing multiple service requirements are very overdue.
An oil service (among others), overdue by 5,000 kms or 237 days… A vehicle check overdue by 597 days.
晚5000公里换油估计没啥问题，但是晚237天换就很危险了，机油长期存放也会氧化变质的。
Our records also show that you will have received notification of a Teleservice Ticket from ****** BMW on July 5th 2018 when the vehicle was 5,000 kms overdue for oil service, then again on September 2nd 2018 when the vehicle was at 48,843 kms and 7,000 kms overdue for oil service. These communications would have either been by telephone or SMS（印象中，电话和短信我好像没有接到。为什么不说发了邮件给我，发邮件会留有记录）.
Dealer电话或者短信提醒不是他们的义务，而是免费服务。该做的保养没做的话，每次启动和熄火都会在屏幕上显示红色或者黄色的信息，这个不该忽略的。
We believe that the timing chain failure would have been avoided if the scheduled service intervals were met, or potentially avoided if the Teleservice notifications were responded to.
我也觉得，假如正常保养的话，正时不该在7年7万多公里就完蛋。你的变速箱这里没提到，不知道有没有发现损伤。
话说回来，我在本论坛已经多次表示过了，因为BMW自己卖超便宜的5年免费保养，因此它自己已经把所需保养的间隔拉长到了很危险的地步。（当然车载电脑会根据你的驾驶状况来自动缩短这个间隔，比如长期市区低速，提示给你的保养间隔就会短一些。）
按照BMW的推荐间隔来保养，已经是比较危险的了，尤其是柴油车还存在柴油浸润机油的问题，机油劣化比汽油机要严重，所以柴油宝马每15000公里或者每18个月一次换油是很推荐的，我自己则是每12个月就换一次。机油机滤是非常非常便宜的东西，也就一箱油的价格，一顿饭的时间，不要省这个。
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The Five People You Meet in Heaven (By Mitch Albom) (2009-4-17) youyousandy 
楼主:Obama_au
发表于 2021-12-13 10:29
