Broken belt engine damage

EE60 · 11-16-2019, 08:53 PM

Are our N55 engines subject to broken belt engine failure like the M54?

Is there a retrofit or fix to prevent? (I've seen a protective plate on line for the 335i)

Thanks

RoundelM3 · 11-17-2019, 07:46 AM

My last car, a 2013 F30 with N55 engine had zero issues with the serpentine belt after 5.5 years.

Aldor27 · 12-08-2019, 08:15 PM

Not too sure but on my n54 two years ago, mine snapped because my motor mounts were shot and some sort of pump pulley hit the subframe. Check your motor mounts.

delvec03 · 12-08-2019, 09:00 PM

auto belt tensioner failure had happened on the n20. depends who you talk to, but if there's a jiggle at idle, you should replace the tensioner. $30 part. worth it.

MarcoZandrini · 12-09-2019, 02:54 PM

Replace the serpentine belt at 75k miles. Sooner if a pulley needs replacement.

11-16-2019, 08:53 PM	#1
EE60 Private First Class 34 Rep 151 Posts Drives: 2015 M235i vert Join Date: Jul 2018 Location: MA iTrader: (0)	Broken belt engine damage Are our N55 engines subject to broken belt engine failure like the M54? Is there a retrofit or fix to prevent? (I've seen a protective plate on line for the 335i) Thanks
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11-17-2019, 07:46 AM	#2
RoundelM3 Major General 1833 Rep 6,987 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Wendell, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	My last car, a 2013 F30 with N55 engine had zero issues with the serpentine belt after 5.5 years. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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12-08-2019, 08:15 PM	#3
Aldor27 Second Lieutenant 87 Rep 280 Posts Drives: 2016 EB 340i Join Date: Feb 2018 Location: Napa Valley iTrader: (1) Garage List 2016 BMW 340i [0.00]	Not too sure but on my n54 two years ago, mine snapped because my motor mounts were shot and some sort of pump pulley hit the subframe. Check your motor mounts.
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12-08-2019, 09:00 PM	#4
delvec03 First Lieutenant 90 Rep 351 Posts Drives: 228i Sport/ DSB Join Date: Feb 2015 Location: United States, DC iTrader: (0)	auto belt tensioner failure had happened on the n20. depends who you talk to, but if there's a jiggle at idle, you should replace the tensioner. $30 part. worth it.
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12-09-2019, 02:54 PM	#5
MarcoZandrini Major 444 Rep 1,264 Posts Drives: 2018 M240i Join Date: Jun 2017 Location: Virginia iTrader: (0)	Replace the serpentine belt at 75k miles. Sooner if a pulley needs replacement.
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