BMW E60 N47 diesel timing chain
Is the timing chain of the BMW E60 520d's N47 engine a known problem?
Yes. The N47 chain can wear out, jump or break. Failures have occurred both in taxi use, which involves a lot of idling, and in private cars. The problem affects part of the cars built in 2007–2009.
How can a timing chain fault be recognised?
The chain starts to make a rattling noise when the tensioner no longer works properly. The noise often precedes the chain breaking, so once you hear it the car should be taken to a BMW dealer or specialist for inspection right away.
Why is the timing chain repair a big job?
The N47 timing drive is at the back of the engine on the flywheel side. The repair requires removing the engine and the gearbox, and the job takes a lot of time. If the timing drive has already been overhauled, the car is the better choice for a buyer.
Does the M47 engine have the same problem?
Not to the same extent. The M47 timing drive is at the front of the engine, and its chain problems mainly involve the tensioner. The repair is considerably cheaper and easier than on the N47.