View Poll Results: Did you experience timing chain failure on your N20 engine? | |||
Yes, my timing chain failed or required replacement. | 33 | 14.47% | |
No, I have not experienced timing chain failure. | 187 | 82.02% | |
I replaced my timing chain as a preventative measure. | 8 | 3.51% | |
Voters: 228. You may not vote on this poll |
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09-19-2020, 10:31 AM | #287 | |
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09-19-2020, 10:35 AM | #288 |
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09-22-2020, 09:37 AM | #289 |
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The guide looks good to me, I'd keep up with your oil changes, and keep taking a look, and listen.
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09-26-2020, 03:27 PM | #290 |
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I hope this get a sticky on the original post. The way they diagnose the chain guides at the dealership is by hearing the engine between 3-4k rpm. There is a unique noise that sounds like a whine caused by friction between the failing guides and the chain. This is a tell tale sign. Even if your car is working fine and not generating any codes, if it has the whine, you better bring it to BMW to get it officially diagnosed. If you are under 7yr/70k miles and your car is eligible you get a free repair. If not there is a class action suit against BMW that has been settled and will pay partially this repair if your car is less than 8yr/100k mi. The benefits of this settlement start in February 2021.
Here some videos so you can recognize the sound: link Last edited by chrisca70; 09-26-2020 at 03:33 PM.. |
09-27-2020, 04:13 AM | #291 | ||
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09-28-2020, 04:47 PM | #292 | |
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Oil changes have been at max 10.000 KM or 1 year since 140.000 KM, before that I think around 30.000 KM. ASS has been disabled since the TC was done.
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09-29-2020, 07:13 PM | #293 |
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hey guys I have a thread documenting a whine I am experiencing.
Worried a little on timing issues, check out my videos: https://f30.bimmerpost.com/forums/sh....php?t=1761991 Thanks
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10-03-2020, 12:08 AM | #294 |
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Currently at about ~64,000 miles and experiencing some whining but it's most noticable at lower speeds only. In case this is the guide, I wanted to know anyone's experience after they had the replacement done.
Has anyone had any residual issues or anything like that after changing the assembly? I am assuming that if the job is done properly that everything should be smooth with it going forward. I just want to make sure before I think about getting the job done. (Oil changes were very poor before I bought the car, around 12-15k miles per change up to 50,000 miles.) |
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11-28-2020, 11:34 PM | #295 |
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Time chain problem
Guys I started reading this forum cause I am about to buy:
BMW 228i Manual transmission. Assembly date 04/2015 Milage 17,500 miles I am reading about this timing chains failures and can’t believe my eyes! I mean timing/mechanic chain suppose to be most reliable part of the engine and suppose to last LIFETIME of the engine! Then I read this insanity. Then some folks say that if the vehicle manufactured after 2/15 then there will be no problems. BMW states the same. Then yet someone points failure on cars made on 08/2015 on N20 types of engines! I mean guys what is it then??? I need to make up my mind soon! Buy or not to buy. But it seems the rate of failure is 15% for cars below 100k miles. This is unacceptable. Unacceptable for such an important part as timing chain. Please kindly advise. |
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11-29-2020, 06:24 AM | #296 | |
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I'm just one person but I would advise not getting an n2x motor built from 2012 to 2016. Mine never had issues and I still ate some cost to get out of it.
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11-29-2020, 06:47 PM | #297 | |
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My 2013 w/107k miles has the whine on cold start but no chain noise, Once warm the noise is gone and pulls hard. The car has been very reliable without almost any issues at all outside of regular maint and has been tuned since 60k miles.
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08-06-2021, 04:20 PM | #298 |
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Model: 2014 BMW 428i XDrive
Mileage: 75,000 miles Timing Chain Status: Failing Caught early. Has not snapped YET. Being replaced Monday. Additional Details: Car is new to me bought it at 73,000 miles. The Dealer I purchased from is being very helpful with the cost of repairs. The car is in immaculate condition and was maintained very very well by the looks of it. Most every other repairs I can deal with beside this Chain. |
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10-05-2021, 07:16 PM | #299 |
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Model: 2015 328i xDrive
Build Date: 09/2014 build date Mileage: 64,500 Timing Chain Status: Failed; caught early and had replaced at no cost Oil Changes: Every 12 mo or 8-10k miles Start/Stop Coded Status: Not coded; normally set to off Additional Details: Purchased as CPO off lease and had 39k miles. Service records indicated previous owner did regular oil changes. |
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10-14-2021, 01:11 PM | #301 |
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Mine is a 2013 with 82k miles. Oil changes have been completed every 5k miles since about 20k, and has been fully serviced by the same shop since then as well. I have my chain and guides inspected every oil change and so far no issues. I'm getting an oil change tomorrow so I'll update.
The common denominator I see in almost every failure is an extended OCI. 8-10k miles is way too long, especially on an engine that already has potential issues.
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10-14-2021, 01:20 PM | #302 |
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The common denominator is the tensioner. The N55 used the same chain and guides, but the tensioner was different. The N20/26 tensioner design was changed in 2016. Changing it to the new design, which as been shown to be very different from the old, would be prudent.
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10-15-2021, 03:58 PM | #303 | |
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For an update, I had my service done today, and by chance BMW happened to be at the shop doing recall work, so they looked at my chain and guides. Both the chain and guides are good, but when cold there was some slight slack in the chain. After running and warming up the car the chain was nice and tight. We'll continue monitoring it as we move closer to 100k, but as of now it didn't appear to be a concern for BMW or my mechanic.
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10-15-2021, 04:07 PM | #304 |
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Process of elimination. If the only difference between the N20 and N55 was the tensioner it's a very short process. Note that even after a redesign of the chain and guide in 2015 BMW still did a redesign of the tensioner in 2016. They didn't do that for the fun of it.
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10-15-2021, 09:16 PM | #305 |
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But what's the actual fault of the tensioner? Parts do get revised and redesigned all the time, but there must be a definitive design flaw that you're referring to.
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10-18-2021, 01:39 PM | #306 | |
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Mileage: 90k miles Timing Chain Status: No problems Oil Changes: Every 7k miles since 52k miles, not sure about PO Stop/Start Coded Status: Not coded, but always turn it off Additional Details: None |
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10-19-2021, 05:36 PM | #307 | |
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10-19-2021, 10:14 PM | #308 |
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The new tensioner puts more pressure on the guide rail. No one really knows what causes the chain to fail, you'd need to have a camera inside an engine when one fails to be sure. It could be that the chain jumps the sprocket, it could be that a loose chain damages the guides, it could be a combination of both. What's common to those scenarios is that they're likely to happen if the chain is too loose. A tensioner that doesn't put enough pressure on the rail could cause that. Since the new design does apply more pressure to the rail my conclusion is that BMW decided that more pressure was required.
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