今天陪朋友去看车，结果他看中了一辆bmw的08年的320D，我问他难道不知道07-11年的宝马N47发动机不安全么？ 结果发现周围好多朋友还真都不知道。 N47发动机因为设计上的缺陷会导致timing chain断裂，结果就是发动机rebuilt。
目前全英已经有数不过来的受害者了，可惜宝马不承认自己的设计失误 也还没有召回计划。
Wiki上的解释 http://en.wikipedia.org/wiki/BMW_N47
Timing chain problems
The N47 engine family is prone to excessive timing chain wear and premature failure.[5] Rattling noise from rear of the engine is indicative of the condition. Timing chain failure may call for engine replacement or a costly repair.[6] The issue applies to all applications and power variants of the engine produced from 01.03.2007 to 01.03.2011. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009. UPDATE - It now seems that there are issues appearing with a limited number of engines manufactured after the supposed safe date of 01.03.2011.[7]
BBC的watch dog已经报道了
http://www.youtube.com/watch?v=HQpQIi7gI_U or http://www.bbc.co.uk/programmes/p01bbfsl
http://www.bbc.co.uk/programmes/b006mg74/features/bmw-chains-snap-n47-engine-2007-2009
友情提醒一下考虑要买07年-11年的宝马的朋友，如果要买可以考虑525D或者530D这样不用N47的车。最容易坏的320D 520D什么的最好就别碰了 尤其是07-09年的。老款的M47发动机其实就很好了。
