![]() Whenever you find out the shaving or debris in the oil when you do the engine oil replacement, it’s a sign to remind you of checking other systems. When the timing chain wore over time, sometimes it will give off the metal debris and shaving.Īnd the shaving may fall into the oil and cause the worse problems. Or, the better way is to bring your BMW to the repairing shop for the thorough check. If you have the diagnostic tool, connecting it to the CPU, and you can have the draft idea for initial check. Of course there are various failures that may trigger the CEL and timing chain failure could be one of them. Just as the failure of the other engine parts, the CEL will be on to remind you that something goes wrong with your vehicle. Then you may feel the idling is getting rougher when the problem goes worse. This is because the chain is loose and may rattle against some other parts.Īs we just mentioned, when the timing chain is loose, the rattle sounds will appear especially when the car is idling. The rattling sound may appear when the chain goes wrong.Įspecially when the car is idling, you may hear the rattling sound from the engine chamber. The timing chain preventative replacement can protect the N47 engine from snapping the timing chain.Īnd next, let’s talk some common failure symptoms for you to pay attention on your N47 vehicle. However, due to the design flaws cause the potential timing chain tensioner problem, we’ll highly recommend the car owners to replace the N47 engine timing chain set periodically. Normally the timing chain kit can last to 80,000-100,000 miles without any problems. Timing chain replacement is very extensive job and can be very costly if the failed chain system damages other engine parts. If the slack is severe to cause the chain to contact the chain cover, you will hear the clanking noise then. The sound will be especially noticeable during the cold startup of the vehicle. ![]() Normally the rattling noise is coming from the rear part of the engine. The loosen chain will cause the sharp rattling sound. ![]() Over time, the chains are getting slacked and getting loose. T he N47 timing chain premature failure comes from the weak tensioners fail to apply proper tense onto the chains. Thousands of these N47 experienced the timing chain problems and some of them even had dropped valves. In Oct 2016, BMW admitted that there was a design flaw with the chain tensioner and chains in its N47 engines which were installed in vehicles between Feb 2007 and Jun 2008.īMW’s technical team planned to replace the timing chains and tensioners in response to this design deficiency which resulted in the premature failures for N47 engine. Just like this car owner, there have been reports from late 2011 that this N47 engine was failing because of the timing chain issue. ![]() The car owner is lucky as the timing chain was not snapped or broken and not affected other engine parts. His customer’s E90 320D visited his shop as his car had a very high-pitched rattling noise coming from the engine during driving.Īfter his diagnose, the rattling sound came from the timing chain which was slacked and caused the loosen gap. One of our repair shop customers contacted us yesterday as his customer needs the N47 timing chain kit for replacement. ![]() So today, let’s talk about N47 timing chain kit premature problems and let’s understand more about its failure symptoms, causes, and the ways to prevent the problems. If you search on the internet for the comments from these car owners, you will notice that there are many complaints about the N47 timing chain assembly. In 2006-2012, it is widely used in the series 1, 3, 5 as 1.6 or 2.0L size engines. N47 engine is a diesel engine which you may find in below BMW models. ![]()
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