N20 timing chain issue

ok I’m getting a lot of questions about the N20 timing chain noise and replacement,,,,here are 2 short audio clips,,,,you can here a high pitched whine in both videos. one video is at 3000rpms,,,,and the other is reving the engine up and down,,,I sent both videos to BMW to get approval on the timing chain repairs.image Here I removed the valve cover and inspected from the top of the engine for any visual problem,,,I don’t know if you can see it in the picture,,,,on top of the chain you can see shiney marks,,,that is an indication the chain is rubbing on something,,,,those marks are not normally there.image Here the old timing chain and guide reins,,,the guide rails were broken.image Here you can see where they broke,,,,the two rails would normally be snapped together.image Here the old  oil pump timing chain module,,,,this comes complete as you see it,,,,did not find anything wrong with this,,,but BMW wants us to replace it at the same time as the timing chain.image Here are the new timing chain guides and rails,,,the new ones are white in color and made of a better plastic we hope,,,,lol.image This is the new oil pump timing chain module complete just bolt in,,,,this job is not one of the best to do,,,,this was on a X3 so I had to deal with the front axles and front differential,,,,,this job only pays about 9.5 hours,,,so you pretty much have one day to complete the job to make any money.,,,I hope this helps some of you guys about the timing chain issues.

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328 Responses to N20 timing chain issue

  1. joe266 says:

    no, i do not have a Lawyer on my case, because i hope BMW will accept the costs. my dealer said i have good chances, because my car has low kilometers and is only 3 years old.
    if i have to pay for it, this will be my last BMW in my life. the n54, i owned before, was a problem child aswell. high pressure pump, turbos, injectors……

    Like

    • This is the case number from puma,,,,,so puma is looking into your problem

      Like

      • joe266 says:

        oh ok, thx Andreas. a misunderstanding. hopefully i get a answer soon. 9 ours left, no response from my dealer.

        Like

      • It takes some time

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      • Dennis herrera says:

        Please fill me in what’s PUMA ?

        Like

      • Ok how do I explain Puma,,,,there are certain parts that we need authorization from BMW to replace and that when we make a Puma case and send all the information to them and they review it,,,,now they give us authorization to to replace the part or maybe they see something on there side that we can not see,,,,and they will tell us what the problem is and what to fix and replace,,,,also when we have transmission problem ,,,,we scan the car and they can see all the information and data from the transmission and tell us what is wrong,,,,,so when we submit a case it goes to puma

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      • Dennis herrera says:

        You think my timing chain failure which damaged my engine can be submitted to puma for review?

        Like

      • Good question,,,,I really don’t know,,,,you might have to ask your dealer if they want to submit a claim to puma about your engine,

        Like

  2. Tossaporn Buddhaporn says:

    Dear Sir i have some problem on my car 2011 F07 535 gt N55

    I start engine on morning then engine stop by them self and wont start anymore i try so hard to researh every common problems that found on internet hope your can help me i found some screw on timming chain slot my question is Does it make engine wont start or not ?

    Here a link to see what happen i already check fuel pump , Ignition Coil , Spark Plug everything fine
    hope you can help me car stuck for 2 week now

    Like

    • Yes that bolt will make it not start,,,,that bolt looks like a vanos unit bolt,,,,,look at the back side of both vanos units and there should be 4 bolt going though each vanos units,,,,,some time the head of the bolt come off causing problems,,,,,I should have some pictures on my blog for replacing vanos gear bolts,,,,,I hope this helps

      Like

      • Tossaporn says:

        Now i cant find that bolt when i used magnet it dropping

        In this case what should i do for engine replace timing chain ?

        Like

      • You first have to find the problem,,,,and decide what to fix,,,,you might have to replace the timing chain,,,,the bolt probably dropped in to oil pan,,,

        Like

  3. joe266 says:

    lol. 4th day @bmw dealer. the mechanic said , they changed several parts like timing chain, camshafter, oil pump and what ever . tomorrow he will do some test drive, to be sure everything works fine. the good news, all of that is paid by BMW.
    hopefully my well known BMW engineer can take a look in the BMW PuMa to inform me, what was done at all.
    on top my horn has a malfunction, i hope on goodwill by BMW. Unbelievable how much trouble i do have with this car.

    Like

  4. bavrider says:

    A non-dealer mechanic said that the N20/N26 has the timing chain tensioner on the side of the engine, and he suggested that when the tensioner is uninstalled, a special BMW tool can be used to measure the play/slack of the timing chain and check against BMW factory spec. Does such a diagnostics tool and diagnostic procedure exist for the N20/N26 engine?

    Like

    • Yes the tensioner is on the side of the engine,,,no there is no special tool for checking the timing chain slack,,,,the timing chain tensioner is oil feed making sure the tensioner is always giving tension on the chain.,,,,the problem is the chain and timing chain rails and oil pump chain.

      Like

      • Dennis herrera says:

        Absolutely correct.. the timing chain guides Crack and allows the chain to jump,which results in pistons meeting valves .. so sad that this DEFECT, BMW is pulling on all thier customers.. blaming them for a flaw design .. shame on you BMW!

        Liked by 1 person

      • bavrider says:

        Thanks for the info. How can oil pump chain be checked, before it breaks?!? The timing chain seems to be accessible through the oil cap opening, but the oil pump chain is totally hidden from sight …. How does stretched/ready-to-break oil pump chain sound like?!?

        Like

      • There no way to check it before it breaks,,,,some guys are lucky and they hear a strange sound before it breaks or a whine noise inside the engine.

        Like

  5. Joe266 says:

    Finaly it is done. They only changed the chain itself, not the rails. Hope they will Keep working next 34000km lol.

    Sounds Good like it should be. Crossing Fingers.
    Another thing they found was the transmission which oils. Maybe i should sell this 1 who knows what comes next.

    Like

    • bavrider says:

      Wow all that work but no guide rail replacement? That is insane!

      Like

      • joe266 says:

        hi bavrider, the problem is that i can’t estimate, if the guide rail replacement was necessary. i’m not a car technican, so i hope my dealer did anything to solve that problem and so it is, the howling noise is gone. seems to be everything is ok with my guide rails. a preventive change would be on my own costs and i’m not ok with that.
        most of all i should have say to my dealer “change every mounting parts of my N20 preventive, they might have a problem” lol.

        Like

      • That’s kind of interesting,,,,lol

        Like

    • I think that sounds like a good idea,,,,lol

      Like

      • bavrider says:

        So does replacing just the timing chain without putting in new guide rail save on labor costs, e.g. no need to drop oil pan? From the videos it looks like removing the timing chain already needs to remove the guide rail, so the additional cost($60?) to swap in a guide rail should be pretty minimal, right?

        Like

      • Yes you are correct ,,,,for $60 doesn’t make any sense

        Like

    • bavrider says:

      There is no reply button on your other post, so I will reply to this one instead. That’s very interesting the guide rail is still OK(hence not replaced) while the timing chain was not. That means the timing chain(in your case) failed first(by stretching), but those flimsy plastic holes on the guide rail attachment piece actually has not been broken. That answers the question whether the chain fails first, or the guide rail fails first.

      Like

      • Good question,,,,I guess we will never know the answer to that problem,,,,unless BMW ever tells us why this happens,,,,lol

        Like

      • joe266 says:

        my thougt was, when they change the chain, the rails and guides would be replaced to, because BMW knows the issue of this lousy plastic. now i know i was wrong 🙂
        hope my friend from munich will look into the Puma next week and can give me some more information.

        Like

      • Let’s hope so,,,,,,I tried to see your puma case,,,but was unable to see it because it wasn’t from my dealer

        Like

  6. James says:

    Hi Andreas. Very interesting thread. Thanks for providing it to us! I read through it entirely.

    Sounds like the issue pertains mainly to 2013 N20’s? But you’ve seen at least one 2014. I also saw something about the problem being resolved with a new chain guide part in 2015/01 (using a stronger plastic). Sometimes there is a whining noise indicating a problem?

    Very confusing for us 2014 owners… Is there any way to know if this could affect mine? It’s a 2014 X3 xDrive28i F25 (245 HP) – 2.0 L with the N20B20O engine.

    And if no particular problems are evident… is replacing the chain guard/ chain recommended preventative thing to just take care?

    Thanks!

    Like

    • It kind hit or miss,,,,the problem doesn’t happen to every N20,,,,the problem is that this problem should not happen at all,,,,so should you update the timing chain and guide rails so you don’t have this problem,,,,oh that’s a tuff question,,,,how long do you plan on keeping the car,,,,,if you plan on keeping the car for a long time and you drive a lot of miles,,,,then yes replace the timing chain and guide rails and oil pump chain.

      Like

      • cenkozkan says:

        Hi, What’s the approximate cost for preventative maintenance on this ? I have a 2014 320i that I want to keep for a while. Is there a way of making sure this doesn’t happen ?
        Thanks.

        Like

      • No there no way of stopping this from happening,,,,it’s just the timing chain was strong enough,,,,,I don’t know the cost of the parts,,,,,the labor should be about 10 to 12 hours of labor time.

        Like

  7. bavrider says:

    It is disappointing that BMW has not stepped up yet to provide some kind of extended limited warranty, especially when other engines(e.g. N52 N/A, N55 turbo) have similar slide rail and guide rail setups, and the timing chains for those also loop around the two VANOS. Those other I6 engines do not have broken guide rails, so why should this N20/N26 I4 turbo have this kind of issue? This is totally unacceptable!!!

    Like

    • I think the timing chain was not strong enough on the N20 engine.

      Like

    • joe266 says:

      i’m with you, but i think they want damage their image. only a few drivers with that chain problem is easier to handle then shout out in the world “here we got a warranty for your N20,cause the timing chain is crap”.

      Liked by 1 person

      • bavrider says:

        Just curious, what is the oil change interval of your car? And is the car tracked and/or driven hard(e.g. turbo is kicked in frequently)? My hope is that my mellow daily driving style will reduce my odds of timing chain failures. It does sound like “Ultimate Driving Machine” these days is just a misnomer. 😦

        Like

      • I have several cars,,,my daily driver Mini clubman is on employ lease so I don’t worry about that car,,,my wife’s Toyota 5k,,,,my project car in garage custom built VW turbo Karmann Ghia about 1k some times drag race,,,,,the ultimate driving is still there just in a different way,,,there still nice cars to drive,,,handle good,,,brake good,,,designed nice.

        Like

      • Joe266 says:

        When i drive out of my garage i enable sport+ and push the pedal to Metal. After i arrive at Work i put some donats on street. After work first thing i have to do is a bournout cause i wanna come home quickly.
        Since i left my 135i, i drive like a granpa for real.
        My car has no Oil change yet, it will be next month the first Time since roll of Band in 05/2014 After 34000km.
        @Andreas. Nice 1 the karmann.
        What i prefer next is a lease too. Minimized having those trouble

        Like

  8. Jesse says:

    Do you have the part numbers for the new white color timing chain guide and rail?

    Like

    • No sorry I don’t,,,the dealer should have the new updated timing chain rail part numbers

      Like

    • bavrider says:

      My local part department said there is no updated guide rail, and they said the brand new white color will age into dark brown with miles and high temperature environment. Do check out the factory N20 engine assembly video on youtube, it shows that those 2012/2013 engines also have white guide rails.

      Like

  9. Jesse says:

    Checking on the web referencing BMW Catalog http://bmwfans.info/parts-catalog
    there was no indication of new part numbers. Maybe they just replacing it with better materials while no changes of part number.. possible?

    Like

  10. Jim says:

    Anyone know about the 5 series F10 2010 models, heard the timing chain is breaking on these also.

    Like

  11. T.Gus says:

    I’m dealing with that same noise on a N20 powered X3, customer brought it in because of the whine and loss of power, pulled a BMW specific underboost code (not P0299) and replaced the electric diverter valve. No underboost code, but still getting the whine.

    Is there a chance I can get assistance from BMW in resolving this since there is a PUMA case?

    Like

  12. T.Gus says:

    When you say you had to deal with the axles and diff, does that mean you had to remove them to drop the oil pan?
    Or is there a way to drop the pan without dropping the entire front drive?

    Like

    • I’m sorry I mean you have to drop the diff and axles to do the work

      Like

      • T.Gus says:

        I kind of found that out.
        Good news is, all that’s left is dropping the pan and actually swapping in the new timing kit.
        If this job flags 9.5, what’s a realistic time for an experienced tech?
        This is my first time, and being an independent, I don’t have a whole lot of factory support.

        Like

      • Let put it this way 9.5 isn’t enough for a traded BMW tech,,,,,I have done that job several times and it’s hard to do it in 9.5 hours,,,,,I did it once in 8 hours but everything went perfect

        Like

  13. Buying aBMW says:

    Would a 2015 X3 28i have the new part (or old one) if it was manufactured in 2014? Looking at purchasing a car that was originally sold as new in June 2014 (but a 2015 model). Looks like Manufacturing date is 06/14 from inside door label.

    Like

    • It hard to say if it has the updated timing chain,,,,that’s to close to call,,,,I would say it doesn’t because who knows when the engine was built,,,,the engine could have been with the old timing chain design.

      Like

  14. Omar Calderon says:

    Would this be the sound?

    Like

  15. Omar Calderon says:

    Guess I’m out of luck will need to start purchasing the parts for the work to be done asap

    Like

  16. gv says:

    The cause I think is poor quality chain tensioner . As it wears the spring becomes less and the chain slaps the rails causing to crack. I think replacing the tensioner every 20-30k miles is sensible , not a big job and not too costly.
    Can I ask where does the metal in the oil filter housing come from, is it from the chain?

    Like

  17. Neil Patel says:

    2012 528i xDrive 70k miles. Exact same whining noise, turned out to be the same issue. BMW dealer told me $4000 to fix. Why haven’t they issued a recall yet?

    Like

    • I wish I had a answer for you guys,,,we talked about this problem at school ,,,,and BMW did not have a answer for us about this problem.

      Like

    • Dennis Herrera says:

      MANUFACTURERS DEFECT, CALLS FOR A RECALL…BMW WONT EXCEPT THAT.

      Like

      • T.Gus says:

        Seeing as how this issue only effects 2012-13 MY cars with the N20/26 engine, and the factory updated the materials, it’s cheaper for BMW to sell the repairs using the updated parts as the issue occurs, rather than issue a full recall. Not EVERY N20/26 engine will present this issue, so they really can’t claim it’s a defect across the board.

        Like

      • Neil Patel says:

        Yea but then if the car shows these issues with these model years, BMW should cover it, which they aren’t doing

        Like

      • T.Gus says:

        From a business standpoint, (I’m not absolving BMW, just playing devils advocate) if BMW offers to cover the cost of replacement for these components, they are admitting culpability. It is much easier, and cheaper (for them) to wait for the cars that have the issue to present themselves. Not every car will have the issue, and not every owner that has a car that does will want to fix it. Some of the cars get traded in, BMW fixes the issue, certifies it, and sells it, or BMWFinance sells them at auction, and wholesalers (like my shop) buy them and sell them. When the customer realizes that there is an issue, they bring it in, we fix it, and remind them how glad they are that we sold them an extended warranty. It sucks for us, because we don’t make much money off of those jobs.

        Like

      • I like to hear other people’s point of view,,,,very interesting.

        Like

      • Dennis herrera says:

        My 2012 328i with less then 50kmiles is a yard ornament. Junk!

        Like

      • Dennis herrera says:

        Either way you cut it this is a recall a soon-to-be recall obviously a timing chain needs to last over 50,000 miles this is a design flaw…

        Like

  18. brad says:

    I have an N20 as well in a 2013 320i sedan. My warranty is up next month so I’d appreciate your opinion regarding the sound of my engine as well…. do you think this is the same whining sound? The later part of the video is revved at 3500 rpm.

    I have had the car since “new” – it was a demo that I purchased but it only had 75 miles on it. I have always had a bit of a diesel clacking sound as well… which I was told by the dealer was the waste gate on the turbo. I have heard other base level 3 series with similar sound, though mine seems much louder. I just mention this in case it comes up. I never fully bought the dealers response though.

    Like

  19. I’m handling an N20 timing chain/engine failure class action. Plz send a contact form at BMWEngineFailureClassAction.com for a no cost consultation & claim. Joseph R. Santoli, Esq

    Liked by 1 person

  20. Omar Calderon says:

    It gets me nervous that my dealer (I’m outside the US) will only replace the timing chain if I want the oil one replaced it comes out of my money don’t know why they want to do it that way.

    Like

    • That really doesn’t make any sense,,,,they should do the job one time and fix it the right way

      Like

      • Dennis herrera says:

        RECALL!! BMW RECALL!!

        Like

      • Ian says:

        This is the same thing they told me too. They replaced the timing chain but told me that I had to pay $1000 to have the oil chain replaced. I complained and contacted BMW directly, as I believe that both chains should be changed when the timing chain is changed – the technician is over half way to the oil chain after all! They defended the dealership but within a few hours I received a call from the dealership to say that had ‘found a way’ to get the oil chain changed under warranty. However, who knows if they actually changed the oil chain. In my experience, you couldn’t trust many of the dealerships in my country with the TV remote, let alone repairing one of these vehicles. I wish my dealership employed Andreas!

        Liked by 1 person

  21. concerned says:

    Does frequent oil change help with this issue?

    BTW, a post in a bmw forum said if oil is overfilled, the oil level measuring system will show it as “oil low”, is that really true?!? What damage can be done with overfilled oil, say, 8L instead of 5L for N20/N26?

    Like

    • Over filling with oil is a very bad thing,,,,it can cause a lot of different problems internally with your engine,,,it can blow out engine seals,,,,,damage piston rings .

      Like

      • concerned says:

        How do these F-chassis show overfilling? The engine oil measuring shows below min or at max, it does not show if oil level is above max. 😦

        Like

      • I know on the 5 and 7 series F chassis say it on the I-drive that engine oil level too high,,,,now on the 3 series F chassis I don’t know if it will tell you it over filled with oil,,,,,if your worried it might be over filled with oil,,,,I recommend starting over and start fresh and perform a oil and filter service

        Like

  22. Håkan H says:

    How much oil do you fill up with when you do an oil and filter service on N20 engine?

    Like

  23. weissx says:

    Hi Andreas, thanks for all your helpful insight on this blog!
    I am noticing a whine from my 2012 X1 x28i. It isn’t as loud as some seem, but the sound is RPM dependant, almost sounds like a dry or dying steering pump, except that it doesn’t vary with steering input. Would you be kind enough to offer your opnion? Thanks!

    Like

    • Thanks for the video,,,,I understand what your hear,,,,you have this slight whine which is hard to tell at this time if that is the timing chain,,,,the noise isn’t load enough to tell at this time.

      Like

      • WeissX says:

        Thanks for the reply! I took it into my dealer and had them have a listen. Picked it up after hours with a list of recommendations to replace items that “made noise”; the BMW factory roof rack, the relatively low mileage BMW brakes, the BMW star rated tires…but dismissed the whine which is obviousto me! 😦 Admittedly I am new to BMW, so perhaps the hyd steering pumps are just loud?

        Like

  24. cenkozkan says:

    Hi there. I have been following this thread for a while and certainly keeping an eye out for mine. I have a slightly unrelated question that I keep getting mixed answers on. Would you happen to know what the differences are between a 320i and 328i in terms of engine, turbo etc ? You probably have had them apart and seen the parts yourself. Seems so many different views online. Thank you.

    Like

    • We really don’t tear apart motors that much anymore,,,,we don’t rebuild them anymore we just replace a whole engine or a complete cylinder head if we have to,,,,but I can tell you the turbos are different,the camshaft so are different and the software is different.

      Like

      • cenkozkan says:

        Thanks for your reply but whichever way I look at the comparison on the N20 engine, US and EU ( I am in the UK) the Turbo part number always comes up the same for both: 11657642469. All sites I can purchase that part from then also come up with fits 320/328. Am I doing something wrong ?

        Like

      • No your not doing anything wrong,,,,maybe you should talk to a BMW part guy and see what he has to say about the different parts for the 320 and 328

        Liked by 1 person

  25. TS63 says:

    Hello, I have ’14 X3 with N20 engine. Can you help me locate engine production date? I am hoping mine was built after 3/13.
    Thanks.

    Like

  26. TS63 says:

    Hello, last 7 digits of my VIN# is 0D29916. My understanding is that if your engine was produced after 3/13, updated timing chain/ guides were used. Am I correct?

    Like

  27. bmwtechnician says:

    TS63,,,your production is 12/2013,,,,yes bulletin sib 11 03 17 before 3/2013 timing chain replacement,,,,sorry

    Like

    • TS63 says:

      Thanks for your help. Since mine was produced well after 3/13, I guess newer timing belt/ guide rail parts were used in my engine.

      Like

      • Xaxiki says:

        According to realoem.com, my 14 X3 was manufactured in OCT 2013. Can anyone comment if it would it be safe to assume that OCT vehicles would have the improved guide rails?

        Like

  28. CO,,,here in USA we have a campaign for timing chain issue if your car is produced before 3/2013,,,,,i don’t know what kind of campaign you have in the UK

    Like

    • CO says:

      Hi, thanks for the reply. My dealer reckons there is no problem with my engine/car in the UK. Mines is a Jan 2014 production. I still have a few months BMW warranty left on it now and would be taking out extended warranty after. Just in case. Am I correct in assuming 01/2014 car has the newer chain housing ?

      Like

    • concerned says:

      My N26 was produced Sept. 2012. The service advisor said there is no outstanding technical campaign on my car. Does this campaign apply only when timing chain noise match the sound file?

      Like

  29. concerned says:

    Unfortunately my cars new car warranty has expired, and it is CPO, so even if tech identifies the noise it will still be out-of-pocket. 😦

    Like

  30. DBU says:

    I wonder whether there is a connection between failed timing chain tensioners and the owner’s use, or non-use, of the engine Auto Start/Stop function. Seems to me that the frequent starts of the engine would strain the timing chain and its tensioner.

    Like

  31. Merdock says:

    First, thanks for your great blog and all the information!
    Second, would you mind looking at this Youtube video of my MY2013 F30 with an N26 (production date of Oct 2012) and giving me your expert oppinion on the timing chain noise? It doesn’t seem to have the intense “dental drill” noise that your videos show, but I’m still concerned. I’ve included a few revs and then holding at 3000rpm.

    Thanks in advance for your help!

    Like

  32. Merdock says:

    Andreas, can you confirm this? This site is now claiming that the timing chain and oil chain is now covered under and extended 7yr/70k warranty.
    http://www.bimmerfest.com/forums/showthread.php?t=1098641

    Like

  33. concerned says:

    Go to bmw-rp.com and input last 7 digits of VIN to check for extended limited warranty coverage. Some friends check that even their 2015 and 2016 F30(3-series) N20/N26 are covered, so it looks BMWNA extends the 7-yr/70k-mile warranty to a lot more N20/N26 than just the 2012 and early 2013 production as shown on SI B11 03 17.

    Do note that if VIN shows up on bmw-rp.com, owners will be able to file for reimbursement on any previous repairs(at dealers or independent mechanics). My understanding is reimbursement is only on previous repairs, any new case from now on needs to be diagnosed and fixed by dealers, that is, BMWNA will not pay future non-dealer work from the date the warranty is extended.

    Liked by 1 person

  34. Bill P says:

    I called BMW USA and they will cover the dealer’s diagnostic charge if the work is approved. But if not approved then it’s your expense. And my local dealer’s SA did not know how many hours the diagnostic would take, and also said he had never heard of any timing chain problems in any BMW, and was not aware of any 7/70 extended warranty until I insisted he take a closer look.

    Like

    • Merdock says:

      Not to pile on, but I talked to my SA (in NorCal) yesterday. He said the 7/70 is valid, does apply to my VIN, and talked to his shop foreman about it. The foreman said that he can’t really tell much from the video I sent, but if I drop by with my car, he will run out and take a listen to see if he can hear the high pitched noise and go from there. I specifically asked if there would be an diagnostic charge, and my SA said, “no, he can just come out and listen when you arrive”. I plan to drop by late next week.

      Like

    • That’s kind of scary that they don’t know anything about BMW having a timing chain problem and that there is a bulletin about this problem,,,,that’s very said for a dealer.

      Like

      • concerned says:

        A local foreman was kind enough to listen to engine whine and gave my N26 a thumbs up. 🙂 He did emphasize that any engine noise still requires authorization of diagnostics fee, as the technician needs to complete diagnostics procedure to formally qualify the noise as related to TC issues or otherwise.

        Liked by 1 person

  35. concerned says:

    This thread(post#2) in another forum says the timing can now be inspected with bore scope(and check for broken timing guide rails), so is bore scope inspection something that can be requested during regular service?

    http://www.bimmerfest.com/forums/showthread.php?t=1112697

    Like

    • Yes we can inspect the timing chain with a bore scope,,,,but we won’t be able to see if there are any problems about to happen,,,,what happened with that repair the engine shut down and the tech used a bore scope to see the damage of the chain and guide rails,,,,then he submitted the pictures to a puma case to show them what happen and then they approved a new engine.

      Like

      • Alberto says:

        If you inspect with a bore scope and see broken guide rails… shouldnt the guide rails and chain be replaced?

        Like

      • You can use a borescope to inspect but there’s not enough room to see the guide rails and the chain rides on the rails,,,,so you can’t get a good picture of the rails.

        Like

      • concerned says:

        This is good to know, so the procedure will be:
        1. if engine whine matches sound file, but bore scope sees no broken rails, then the timing chain + oil chain + oil pump + rails + miscellaneous will be replaced.
        2. if engine whine matches sound file, AND bore scope takes picture of broken plastic rails, then engine will be replaced.

        Sounds about right?

        This sounds like an hour of labor, but local service says they need 4-6 hours to tear down engine per SIB, is that really 4-6 hours, or just an hour?

        Like

      • The 4 to 6 hour sounds about right for a tear down,,,,the tear down would be valve cover and oil pan removed,,,,the whole job to replace timing chain and rails and oil pump chain only pays us 9hr.

        Like

  36. NN26 says:

    Hi, Great thread, I have a 2014 428xi N26 i4 twin turbo with a build date of 2013-09-24. 35,500 miles. Still seems to be purring like a kitten. My 5-year manu warranty ends 11/2017. I do have the extended full coverage warranty through Carmax here in the U.S.

    From what I’ve read, it appears as though my vehicle was produced after the cut-ff and might have the improved TC components. Correct?

    Like

  37. Serdar says:

    Cool info man. I’m a Mercedes-Benz Service Advisor with n20 / f30 x-drive with 130000 kilometers. No any problems other than 1 failed ignition coil but it is good to keep an eye (or ear?) on these chains. I once changed chain/guides/tensioners on a 2008 n47 and it was very hard with Mercedes-Tools (locking the shafts etc) and dropping transmission, lifting the engine. Thankfully n20 has the chains in front and I’m planning to change everything about chain/rails/tensioner whatever I find there just to be sure. No noises but I want to it for fun at least.

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  38. Dan Sweigart says:

    How many hours labor do you estimate for timing chain and oil chain replacement on the N20 engine?

    Like

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