Timing chain problems
The N47 engine family is prone to excessive timing chain wear and premature failure.[3] Rattling noise from the rear of the engine is indicative of the condition. Timing chain failure may call for engine replacement or a costly repair. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009.[4]
ปํญหาตัวดันโซ่ราวลิ้นน่าจะจบตั้งแต่ปี 2009 แล้วครับ
หาอ่านเพิ่มอีกนิดครับ มันลามไปถึงปีสุดท้ายแล้ว
ช่วยหาเคสที่เกิดขึ้นกับ f30 หรือ f10 ให้ดูหน่อยได้ไหมครับ ผมสิงอยู่ club f30 ตปท ยังไม่เคยเจอครับ
https://www.irishtimes.com/life-and-style/motors/bmw-s-timing-chain-problem-comes-back-to-haunt-carmaker-1.2869493
ตามเนื้อหาที่คุณเจ โพสมา ที่เกิดปัญหามีถึงปี 2011 นิครับ สรุปว่า f30 หรือ f10 ก็ยังไม่มีปัญหา ตามข้อมูลที่ผมได้หามา ได้มีการ Redesign sprocket ตั้งแต่ปลายปี 2011 แล้วนะครับ ถ้าจะมีคือแค่เสียง แต่ไม่ขาด ถึงเคสก่อนหน้าที่มีการขาดๆกันก็คิดเป็นแค่ 10 % ของเครื่อง N47 ( ปีก่อน 2011) Apparently it was never the chain that was the problem, but the sprocket on the crank shaft driving said chain. Its teeth were 'too edgy' for want of a better word and could cause a lengthening of the chain over time. About 10% of the cars sporting that engine developed problems. BMW never actually issued a recall but decided on a case by case basis whether they applied 'good will' when repair was required. Repair required meaning bad chain noise and in the worst case scenario - if noise was ignored for long enough I suppose - chain snaps with engine bollixed obviously.
I understand over time several alterations were made to the engine regarding this problem. I believe since late 2011 the offending crank shaft sprocket is revised. The official BMW party line since then is that noise problems due to a slight lengthening of the chain may still occur, but no snaps. It is therefore considered merely a 'convenience problem' (noise). I believe an improved tensioner is also available. From what I read if you have a mid 2013 or onwards this should totally be a non issue. I haven't seen any of the above being contradicted really.
You still read about the odd freak snap but you would read that about any engine. Sometimes sh1t just happens.
Whether the lengthening causing the noise problem still occurs or not depends apparently a lot on driving pattern. The more of its running hours this engine spends under proper operating temperature the better. Which is true for any engine really. But apparently many short trips where the engine never reaches operating temperature promotes the problem.