BMW N47 Engine Problems – How to Fix Timing Chain Failure!



From 2007 to approximately 2014, the BMW N47 was an inline 4-cylinder diesel engine that was utilised in the BMW 1, 2, 3, and 5 sequence, as perfectly as the X1 and X3 diesel models.

The N47 engine series is inclined to early timing chain failure due to critical timing chain put on. The situation is indicated by a rattling sounds coming from the engine’s rear. Failure of the timing chain may necessitate motor alternative or a high-priced repair. The difficulty impacts all applications and power versions of the engine made involving March 1, 2007 and March 1, 2011. The most severely damaged models, which call for the most significant repairs, have been made among the dates of 01.03.2007 and 05.01.2009. UPDATE – It seems that a smaller quantity of engines manufactured soon after the recall are getting complications.

Timing chain

The timing chain on this motor is sandwiched between the motor and the transmission at the back of the motor. Its substitute is specially complicated mainly because it is positioned in this kind of an inaccessible place. In most conditions, parts set up in this sort of inaccessible areas are intended to survive the existence of the motor, but not in this circumstance. The timing chain in the N47 can fail anywhere from 40 to 100k miles, leading to catastrophic motor damage as its components drop synchronization.

Diagnosis – Signs or symptoms of a Failing Timing Chain

The indications of a failed timing chain typically look steadily as the chain gets lengthier and far more worn. As a end result, you’re unlikely to detect a sudden extraordinary symptom right until the chain is around to break totally. As a substitute, imagine about how your automobile is executing today and how it performed a lot of months back. Modest troubles could suggest that the chain is about to fall short fully.

Right here are some of the symptoms that your timing chain is failing:

  • Tough idling: Begin your vehicle and stroll away. It’s possible that the timing chain is putting on out if it shakes or vibrates more than standard. Of system, there are other difficulties that could outcome in severe idling, but the problem is generally worth investigating since it tends to worsen more than time.
  • Bizarre noises: You may well hear your N47 motor rattle, especially when it’s idling, but not only when it is idling. The problem could be that the timing chain is loose and rattling in opposition to anything else if the seem is persistent and tough. 
  • Metallic shavings in the oil: In excess of time, the timing chain will put on down. When it reaches the stop of its valuable daily life, it may emit metallic shavings. If it does, it will close up in your motor oil, perhaps causing further challenges.  Even so, any worn-out portion of your car can generate metal shavings, so it’s worth looking into prior to simply changing the chain.
  • Engine failures: If your BMW would not get started, the chai could be harmed and not supplying enough pressure to begin the motor. If the chain breaks although you’re driving, it is doable that the timing chain has broken as perfectly. If this takes place, the pistons could be broken, and the belt issue may perhaps result in a lot more harm to your car.
  • Engine misfires: Your N47 motor may well misfire ahead of the chain has fully snapped. The cam and the crankshaft are connected by a chain. The chain may well trigger the motor vehicle to skip a gear on both the crankshaft or the camshaft if it is extremely stretched out. It will develop into additional pressured as a end result of this, and it will sooner or later crack.
  • Check motor gentle is on: Of study course, the look at motor mild could signal a significant assortment of items have gone improper with your BMW. However, it is attainable that the timing chain has unsuccessful or is before long to are unsuccessful.

Alternative and Repairs

Mainly because the timing chain is in these types of an inaccessible locale, the mechanic need to thoroughly clear away the motor from its bay to get accessibility to it. Using the engine out is a substantial and tough enterprise in and of itself. Adhering to that, a further prolonged disassembly is demanded to acquire accessibility to the chains themselves.

3 timing chains are included in the timing chain substitute kit: a person for the oil pump, one for the camshaft, and one particular for the superior-stress gas pump. You are going to also will need the hunting tool package to hold the crankshaft and camshaft synchronized whilst you are working on them. These are the major duties that should be finished just after getting rid of the engine from the bay in buy to change the timing chains.

To start off, make confident that cylinders 1 and 4 are at leading lifeless heart in purchase to keep the point for synchronizing the factors.

With the instruments you have, lock your crank shafts at this location.

Take out the camshaft chain tensioner to loosen the chain a little, and loosen the a few bolts on the camshaft sprocket.

It will be much easier to take out the gasoline pump sprocket if the higher-stress gas pump is turned off.

Remove the flywheel from the crankshaft by eradicating the bolts that maintain it in spot.

Get rid of the starter motor’s bolts to gain accessibility to the oil sump.

By undoing the needed bolts, you can take away the oil sump.

Take out the timing address by loosening the nuts that hold it in place. It will acquire some prying and a handful of mild taps with the hammer. You can now accessibility all of the chains and sprockets.

By loosening the bolts, you might now eliminate the oil pump sprocket and the oil pump guides. Clear away the oil pump’s chain as very well.

Similarly, eliminate the camshaft sprocket’s guides and tensioner, as effectively as the sprocket and belt.

Following TDC, twist the crankshaft 45 levels and take out the large-tension fuel pump tensioner, guides, and sprockets. Take off the belt and the sprockets as effectively.

The past merchandise is your oil sprayer, which you may take out for substitute if required.

Then, in reverse buy, put in the substitute belts, making certain that all factors are in sync until the summary.


This timing chain issue is a layout flaw in the engine, and the only approach to remedy it is to stay away from automobiles with this N47 engine or, if doable, get rid of it in functioning get. Because of the emission command equipment put in it, these kinds of as the EGR and DPF, this engine also has a great deal of problems.


Source backlink