BMW F30 N47 diesel timing end faults
Is the timing end of the BMW F30 N47 diesel a weak point?
Yes, the N47's timing end parts (chain, sprockets, guides) are known as a weak point. Replacing the timing end has been common especially in engines built up to 2012. However, not all cars need replacement, and the failure rate varies.
When has the N47 timing end needed replacing and how can you tell?
Parts have been replaced pre-emptively at about 125-160 thousand km. The symptom has been a noise at idle and during engine braking. If the noise is heard, have the condition of the chain checked in good time. Replacing the whole timing end is a bigger job, so it is worth doing before the parts break.
Is the B47 timing end more durable than the N47's?
The same problem has not been reported in the B47, and some taxis have driven over 250 thousand km without faults. The N47's timing end was updated for cars built in spring 2013, and there are several versions of the updates. There is not yet much long-term experience of the B47.
How can you protect the condition of the N47 timing end?
Changing the oil more often than usual keeps the engine in good condition. The suitable interval depends on use, so ask a service shop. There is no need to fear faults from driving an engine considered reliable, as long as servicing is up to date and strange noises are reacted to.