May 23, 2024

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



From 2007 to roughly 2014, the BMW N47 was an inline 4-cylinder diesel motor that was used in the BMW 1, 2, 3, and 5 collection, as effectively as the X1 and X3 diesel products.

The N47 motor sequence is prone to early timing chain failure thanks to intense timing chain put on. The condition is indicated by a rattling sound coming from the engine’s rear. Failure of the timing chain may possibly necessitate motor substitution or a costly fix. The dilemma affects all programs and electric power variants of the motor made between March 1, 2007 and March 1, 2011. The most seriously destroyed units, which call for the most significant repairs, have been created amongst the dates of 01.03.2007 and 05.01.2009. UPDATE – It seems that a tiny selection of engines designed following the remember are having issues.

Timing chain

The timing chain on this motor is sandwiched concerning the motor and the transmission at the again of the motor. Its replacement is in particular complicated since it is positioned in this kind of an inaccessible location. In most circumstances, pieces set up in these kinds of inaccessible locations are meant to survive the existence of the engine, but not in this condition. The timing chain in the N47 can fail anywhere from 40 to 100k miles, producing catastrophic motor injury as its elements get rid of synchronization.

Analysis – Signs and symptoms of a Failing Timing Chain

The signs or symptoms of a unsuccessful timing chain normally surface slowly as the chain will become longer and additional worn. As a outcome, you are unlikely to detect a sudden remarkable symptom until finally the chain is in the vicinity of to break totally. As a substitute, imagine about how your car is carrying out these days and how it carried out numerous months ago. Modest difficulties could recommend that the chain is about to fall short completely.

In this article are some of the symptoms that your timing chain is failing:

  • Tough idling: Get started your car and stroll away. It is doable that the timing chain is carrying out if it shakes or vibrates additional than typical. Of study course, there are other difficulties that could outcome in severe idling, but the difficulty is normally worthy of investigating mainly because it tends to worsen about time.
  • Strange noises: You could possibly listen to your N47 engine rattle, primarily when it is idling, but not only when it is idling. The situation could be that the timing chain is free and rattling towards anything else if the sound is persistent and rough. 
  • Steel shavings in the oil: Around time, the timing chain will use down. When it reaches the conclusion of its valuable lifestyle, it could emit metallic shavings. If it does, it will conclude up in your engine oil, maybe triggering further more troubles.  Nevertheless, any worn-out part of your car can create steel shavings, so it is worthy of on the lookout into ahead of just replacing the chain.
  • Engine failures: If your BMW would not begin, the chai may perhaps be damaged and not supplying adequate stress to start the engine. If the chain breaks though you are driving, it’s possible that the timing chain has broken as very well. If this takes place, the pistons could be damaged, and the belt problem may lead to more destruction to your automobile.
  • Motor misfires: Your N47 motor could misfire prior to the chain has wholly snapped. The cam and the crankshaft are joined by a chain. The chain may induce the auto to skip a equipment on possibly the crankshaft or the camshaft if it is overly stretched out. It will turn into a lot more stressed as a consequence of this, and it will sooner or later break.
  • Check out engine mild is on: Of program, the verify motor gentle could signal a huge wide variety of issues have absent improper with your BMW. However, it is probable that the timing chain has failed or is shortly to fall short.

Substitution and Repairs

Due to the fact the timing chain is in these an inaccessible locale, the mechanic should thoroughly take out the engine from its bay to obtain access to it. Using the engine out is a substantial and hard undertaking in and of by itself. Pursuing that, a different prolonged disassembly is demanded to obtain access to the chains on their own.

3 timing chains are incorporated in the timing chain replacement kit: one for the oil pump, just one for the camshaft, and just one for the high-tension fuel pump. You will also require the searching instrument kit to continue to keep the crankshaft and camshaft synchronized though you are working on them. These are the major tasks that should be done right after eradicating the motor from the bay in order to swap the timing chains.

To start off, make certain that cylinders 1 and 4 are at top useless middle in order to keep the point for synchronizing the factors.

With the tools you have, lock your crank shafts at this locale.

Eliminate the camshaft chain tensioner to loosen the chain a little, and loosen the 3 bolts on the camshaft sprocket.

It will be a lot easier to get rid of the fuel pump sprocket if the higher-strain gasoline pump is turned off.

Eliminate the flywheel from the crankshaft by removing the bolts that keep it in spot.

Remove the starter motor’s bolts to attain obtain to the oil sump.

By undoing the necessary bolts, you can get rid of the oil sump.

Clear away the timing cover by loosening the nuts that hold it in put. It will get some prying and a couple delicate faucets with the hammer. You can now access all of the chains and sprockets.

By loosening the bolts, you may now eliminate the oil pump sprocket and the oil pump guides. Get rid of the oil pump’s chain as perfectly.

Likewise, take out the camshaft sprocket’s guides and tensioner, as perfectly as the sprocket and belt.

Right after TDC, twist the crankshaft 45 levels and clear away the higher-tension fuel pump tensioner, guides, and sprockets. Take off the belt and the sprockets as well.

The previous item is your oil sprayer, which you may perhaps eliminate for alternative if needed.

Then, in reverse buy, put in the substitute belts, making sure that all elements are in sync right up until the summary.


This timing chain problem is a style flaw in the motor, and the only process to remedy it is to steer clear of vehicles with this N47 engine or, if attainable, get rid of it in doing the job buy. Mainly because of the emission handle products set in it, these types of as the EGR and DPF, this engine also has a large amount of concerns.


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