belt snapped 3 times in a week

omgsorr · 03-19-2015, 04:22 PM

posted in my regional forums but looking for input from everyone. how common is this issue on n54 motors? I plan to go to a service advisor but doubt they can help me (08 335 123k miles)

any advice? I know it's a subframe issue rubbing on belt. just need to know my options.

CHECKERED · 03-19-2015, 04:37 PM

replace motor mounts...

Miko226 · 03-19-2015, 04:52 PM

Quote:

Originally Posted by CHECKERED

replace motor mounts...

+1

Myrder · 03-19-2015, 05:06 PM

replace the mounts. But the "real" fix is to replace your subframe with an updated one. My friend had that done... $$$$

CHECKERED · 03-19-2015, 05:08 PM

Quote:

Originally Posted by Myrder

But the "real" fix is to replace your subframe with an updated one. My friend had that done... $$$$

its probably cheaper to sell the car and buy a lower mileage one...

omgsorr · 03-19-2015, 05:09 PM

Quote:

Originally Posted by Myrder

replace the mounts. But the "real" fix is to replace your subframe with an updated one. My friend had that done... $$$$

assuming updated subframe would be lci ones? doubt they sell old ones still.

Jeef · 03-19-2015, 05:33 PM

Quote:

Originally Posted by CHECKERED

Quote:

Originally Posted by Myrder

But the "real" fix is to replace your subframe with an updated one. My friend had that done... $$$$

its probably cheaper to sell the car and buy a lower mileage one...

I don't think subframes cost as much as the car haha

omgsorr · 03-19-2015, 05:44 PM

Quote:

Originally Posted by Jeef

Quote:

Originally Posted by CHECKERED

Quote:

Originally Posted by Myrder

But the "real" fix is to replace your subframe with an updated one. My friend had that done... $$$$

its probably cheaper to sell the car and buy a lower mileage one...

I don't think subframes cost as much as the car haha

been looking and seems like a few hundred bucks. labor costs is where I'll get butt hurt I think.

Jeff@TopGearSolutions · 03-19-2015, 05:52 PM

Motor mounts, new sub frame or cut a notch out of the sub frame (not recommended).

omgsorr · 03-19-2015, 05:53 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

Motor mounts, new sub frame or cut a notch out of the sub frame (not recommended).

considered slight shaving until I find a decent priced subframe. not gonna cut a notch.

03-19-2015, 06:03 PM

Does anyone have pics comparing "old" and "new" subframes? I've yet to see evidence that a newer version exists (no superseded part numbers, etc.)

Jeff@TopGearSolutions · 03-19-2015, 06:17 PM

Quote:

Originally Posted by omgsorr

considered slight shaving until I find a decent priced subframe. not gonna cut a notch.

For liability reasons I can't recommend it but I'd probably do the same, at least temporarily.

NightStalker · 03-19-2015, 08:23 PM

Are the motor mounts similar to the transmission mounts?

Is this a labor intensive job?

sirdaft1 · 03-19-2015, 10:43 PM

Do the motor mounts. I had 135k on my original mounts and they were wornnn. It should take care of it for you.

NA55 · 03-19-2015, 11:42 PM

try upgrading your engine and transmission mounts..

robc1976 · 03-20-2015, 12:04 AM

Quote:

Originally Posted by CHECKERED

its probably cheaper to sell the car and buy a lower mileage one...

$587.00 fix, 1 hour to put subframe in, its actually not that hard.

Nitrousbird · 03-20-2015, 07:28 AM

Quote:

Originally Posted by robc1976

$587.00 fix, 1 hour to put subframe in, its actually not that hard.

Previous owner of mine had it done. Receipt I have (from a BMW dealer) was $2600.

I know I wouldn't have paid that to have it fixed and would have done it myself.

As for the OP, I'd start with motor mounts and if that doesn't fix it, pull the subframe and grind down on that area for clearance.

omgsorr · 03-20-2015, 08:45 AM

Thanks everyone. This has been bugging me a bit now. Actually fix my cars CEL problem and once engine runs fine all the torque causes it to rub now. Great.

ts335i07 · 03-20-2015, 08:58 AM

My motor mounts were noticeably worn at 65k, check your thermostat connector as well for damage, that usually gets damaged before kicking the belt...

03-20-2015, 09:48 AM

Quote:

Originally Posted by omgsorr

Thanks everyone. This has been bugging me a bit now. Actually fix my cars CEL problem and once engine runs fine all the torque causes it to rub now. Great.

Huh? What's rubbing?

You might have accidentally the whole thing.

omgsorr · 03-20-2015, 09:49 AM

Quote:

Originally Posted by FCobra94

Quote:

Originally Posted by omgsorr

Thanks everyone. This has been bugging me a bit now. Actually fix my cars CEL problem and once engine runs fine all the torque causes it to rub now. Great.

Huh? What's rubbing?

You might have accidentally the whole thing.

its rubbing under heavy torque, havnt pulled it apart get but its pretty obvious.

The Convert · 03-20-2015, 10:27 AM

Have you replaced the pulleys? Most people who have had your issue noticed damaged pulleys.

03-19-2015, 04:22 PM	#1
omgsorr Private 8 Rep 59 Posts Drives: 08 335xi Join Date: Feb 2013 Location: NNJ iTrader: (2)	belt snapped 3 times in a week posted in my regional forums but looking for input from everyone. how common is this issue on n54 motors? I plan to go to a service advisor but doubt they can help me (08 335 123k miles) any advice? I know it's a subframe issue rubbing on belt. just need to know my options.
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03-19-2015, 04:37 PM	#2
CHECKERED ex deus machina 128 Rep 968 Posts Drives: G30, F15, Audi S4 Join Date: Oct 2012 Location: Southern NH iTrader: (12)	replace motor mounts... __________________ Daily: G30 M550i, Bluestone, JB4, 1 step colder plugs, 6WB retrofit Winter Beast: Audi S4 4.2L V8, Supercharger, brakes, suspension & exhaust mods Wifes': F15 M50d clone, DUDMD tune, WMI, MPBK Gone: E92 335i N54 468rwtq
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03-19-2015, 05:06 PM	#4
Myrder Major 163 Rep 1,264 Posts Drives: 2010 E92 335i MSport 6MT LMB Join Date: Apr 2013 Location: WildWest iTrader: (1)	replace the mounts. But the "real" fix is to replace your subframe with an updated one. My friend had that done... $$$$ __________________ 2010\|335i\|LMB\|E92\|6MT\|MSport\|Logic7\|335is Clutch\|AE Performance\|BMS\|Walbro\|VRSF 7"\| 149.7mph NFZ AZ 1/2mi 1992\|Pontiac Firebird\|Mild 355ci\|T56\| -I will look on your treasures, gypsy. Is this understood?-
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03-19-2015, 05:52 PM	#9
Jeff@TopGearSolutions 3474 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Motor mounts, new sub frame or cut a notch out of the sub frame (not recommended).
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03-19-2015, 06:03 PM	#11
FCobra94 Guest 0 Rep n/a Posts Drives:	Does anyone have pics comparing "old" and "new" subframes? I've yet to see evidence that a newer version exists (no superseded part numbers, etc.)
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03-19-2015, 08:23 PM	#13
NightStalker ✰ 274 Rep 2,741 Posts Drives: Audi Join Date: Nov 2008 Location: New York City iTrader: (12)	Are the motor mounts similar to the transmission mounts? Is this a labor intensive job?
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03-19-2015, 10:43 PM	#14
sirdaft1 Brigadier General 2251 Rep 3,353 Posts Drives: F85 X5M Join Date: Feb 2013 Location: Chicago West Burbs iTrader: (9) Garage List 2016 BMW X5M [9.00] 2012 BMW X5 35i (SOLD) [9.67] 1989 BMW 325i Track ... [10.00] 2007 E90 WTCC Wideb ... [8.50]	Do the motor mounts. I had 135k on my original mounts and they were wornnn. It should take care of it for you.
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03-19-2015, 11:42 PM	#15
NA55 Second Lieutenant 33 Rep 269 Posts Drives: 335i Join Date: Oct 2013 Location: LA iTrader: (0)	try upgrading your engine and transmission mounts..
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03-20-2015, 08:45 AM	#18
omgsorr Private 8 Rep 59 Posts Drives: 08 335xi Join Date: Feb 2013 Location: NNJ iTrader: (2)	Thanks everyone. This has been bugging me a bit now. Actually fix my cars CEL problem and once engine runs fine all the torque causes it to rub now. Great.
	Appreciate 0 Quote

03-20-2015, 08:58 AM	#19
ts335i07 tech 8 Rep 55 Posts Drives: 07 335i Join Date: Mar 2013 Location: lakewood NJ iTrader: (3)	My motor mounts were noticeably worn at 65k, check your thermostat connector as well for damage, that usually gets damaged before kicking the belt...
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03-20-2015, 10:27 AM	#22
The Convert Banned 43 Rep 303 Posts Drives: 335i Join Date: Oct 2014 Location: midwest iTrader: (0)	Have you replaced the pulleys? Most people who have had your issue noticed damaged pulleys.
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