F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > motor mount shot
ARMA SPEED
Post Reply
 
Thread Tools Search this Thread
      07-26-2013, 09:29 PM   #1
cshih2
Enlisted Member
12
Rep
46
Posts

Drives: F30 320i
Join Date: Dec 2012
Location: Taiwan

iTrader: (0)

motor mount shot

unfortunately my f30 320i passenger side motor mount is shot and gonna be replaced by dealer under warranty, just 7500 miles.
somehow i remember motor mounts must be replaced by pair? am i right?
Appreciate 0
      07-27-2013, 09:17 PM   #2
BavarianFanatic
Too much is never enough
United_States
655
Rep
3,079
Posts

Drives: Too Many
Join Date: Mar 2008
Location: SE PA

iTrader: (0)

Quote:
Originally Posted by cshih2 View Post
unfortunately my f30 320i passenger side motor mount is shot and gonna be replaced by dealer under warranty, just 7500 miles.
somehow i remember motor mounts must be replaced by pair? am i right?
Nah. No real rational reason for replacing them in pairs. If it needs one already, it was defective from day one. The others should be fine.
Appreciate 0
      08-23-2013, 09:02 PM   #3
cshih2
Enlisted Member
12
Rep
46
Posts

Drives: F30 320i
Join Date: Dec 2012
Location: Taiwan

iTrader: (0)

Guess what, replaced my passenger side motor mount a month's ago and now noise from driver side motor mount, just got back dealer and they will replace it under warranty again, but, how is this possible? Drove it for only 6 months, delivered on 02/13, manufactured on 08/12. 8k miles on it.
Appreciate 0
      08-28-2013, 04:18 PM   #4
kevbh
Private First Class
7
Rep
158
Posts

Drives: 2013 320i, E46 M3 track car
Join Date: Apr 2006
Location: On Track

iTrader: (0)

Quote:
Originally Posted by cshih2 View Post
Guess what, replaced my passenger side motor mount a month's ago and now noise from driver side motor mount, just got back dealer and they will replace it under warranty again, but, how is this possible? Drove it for only 6 months, delivered on 02/13, manufactured on 08/12. 8k miles on it.
What symptoms did you have that led you to believe you had a motor mount failure? Just curious.
__________________
2013 320i, 6sp Manual, Sport Package / 2003 M3 track car
Appreciate 0
      08-28-2013, 05:43 PM   #5
btbossman
Banned
United_States
103
Rep
1,715
Posts

Drives: 2013 335xi M sport--2014 M6
Join Date: Jul 2013
Location: Charlotte, NC

iTrader: (0)

Quote:
Originally Posted by BavarianFanatic View Post
Nah. No real rational reason for replacing them in pairs. If it needs one already, it was defective from day one. The others should be fine.
WOW, thats crazy!
Appreciate 0
      08-28-2013, 07:49 PM   #6
cshih2
Enlisted Member
12
Rep
46
Posts

Drives: F30 320i
Join Date: Dec 2012
Location: Taiwan

iTrader: (0)

Quote:
Originally Posted by kevbh View Post
What symptoms did you have that led you to believe you had a motor mount failure? Just curious.
turn off everything in cabin, shift between drive and reverse(doesn't matter if the brake is applied), when the car is making slight movement, a squeaky noise comes from firewall area.

Last edited by cshih2; 08-29-2013 at 10:23 AM..
Appreciate 0
      08-28-2013, 09:40 PM   #7
Kabrich
Banned
United_States
354
Rep
1,986
Posts

Drives: '13 AH3 (335IH) 3F93 MSport
Join Date: May 2013
Location: Florida

iTrader: (6)

Out of curiosity, Munich or SA build?
Appreciate 0
      08-29-2013, 10:23 AM   #8
cshih2
Enlisted Member
12
Rep
46
Posts

Drives: F30 320i
Join Date: Dec 2012
Location: Taiwan

iTrader: (0)

SA
Appreciate 0
      08-29-2013, 01:00 PM   #9
kevbh
Private First Class
7
Rep
158
Posts

Drives: 2013 320i, E46 M3 track car
Join Date: Apr 2006
Location: On Track

iTrader: (0)

Interesting. In some cars, broken engine mounts lead to coolant hoses and the fans getting together when the engine moves. Sounds like you issue was much more subtle, luckily.
__________________
2013 320i, 6sp Manual, Sport Package / 2003 M3 track car
Appreciate 0
      08-29-2013, 02:25 PM   #10
mikew2069
Lieutenant Colonel
mikew2069's Avatar
413
Rep
1,975
Posts

Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (2)

Quote:
Originally Posted by cshih2 View Post
turn off everything in cabin, shift between drive and reverse(doesn't matter if the brake is applied), when the car is making slight movement, a squeaky noise comes from firewall area.
I have a similar symptom... I thought it was the steering wheel. I'll have to look into this.
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
Appreciate 0
      07-05-2018, 10:59 AM   #11
eraxy
Private
No_Country
12
Rep
79
Posts

Drives: 3
Join Date: Oct 2017

iTrader: (0)

I have the same problem...
Appreciate 0
      07-07-2018, 06:19 PM   #12
rak299
Major
United_States
598
Rep
1,044
Posts

Drives: 2021 M3 6MT
Join Date: Sep 2016
Location: san francisco

iTrader: (0)

Going back to earlier statement that they don't need to be replaced in pairs. If one fails and is not replaced immediately, the vibration can damage the other two. If one fails and it takes a while to diagnose, I replace all 3.
Appreciate 0
      07-07-2018, 07:50 PM   #13
BEAR-AvHistory
2020 Z4 M40i - 2022 M4C Convt
BEAR-AvHistory's Avatar
United_States
3121
Rep
5,264
Posts

Drives: 2020 Z4 M40i - 2022 M4C Convrt
Join Date: Jun 2011
Location: Raleigh, NC - OIB, NC

iTrader: (0)

Garage List
Had one fail on one BMW car, 2014 435 @ 35K miles. Never happened before or after on any BMW I had. Poor part QA?

Only other mount failure I had in about 60 years of driving was on a 1962 409/409 4MT Impala. Can't imagine why that happened.

I would check the other two but I it was caught right away a single replacement should be good to go.
__________________
Kevin
Dravit Gray, Black Leather, Moonlight Roof, Red Calipers

2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT
Appreciate 0
      07-08-2018, 04:47 AM   #14
eraxy
Private
No_Country
12
Rep
79
Posts

Drives: 3
Join Date: Oct 2017

iTrader: (0)

Quote:
Originally Posted by cshih2 View Post
turn off everything in cabin, shift between drive and reverse(doesn't matter if the brake is applied), when the car is making slight movement, a squeaky noise comes from firewall area.
in the meantime, they changed passenger side twice and driver side once. Guess what... they are shot again after 1500 km of driving.

Either it must be reall bad quality, or something is hurting the mounts.

However, they just replaced the front engine mount. I´ve heart, there might be a third mount??

Edit: car has only 22t km, 14t miles on it.
Appreciate 0
      07-08-2018, 12:18 PM   #15
BEAR-AvHistory
2020 Z4 M40i - 2022 M4C Convt
BEAR-AvHistory's Avatar
United_States
3121
Rep
5,264
Posts

Drives: 2020 Z4 M40i - 2022 M4C Convrt
Join Date: Jun 2011
Location: Raleigh, NC - OIB, NC

iTrader: (0)

Garage List
Quote:
Originally Posted by eraxy View Post
in the meantime, they changed passenger side twice and driver side once. Guess what... they are shot again after 1500 km of driving.

Either it must be reall bad quality, or something is hurting the mounts.

However, they just replaced the front engine mount. I´ve heart, there might be a third mount??

Edit: car has only 22t km, 14t miles on it.
There are 3 mounts.
__________________
Kevin
Dravit Gray, Black Leather, Moonlight Roof, Red Calipers

2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT

Last edited by BEAR-AvHistory; 07-08-2018 at 12:31 PM..
Appreciate 0
      07-08-2018, 03:16 PM   #16
rak299
Major
United_States
598
Rep
1,044
Posts

Drives: 2021 M3 6MT
Join Date: Sep 2016
Location: san francisco

iTrader: (0)

There is a rear mount under the transmission behind the spot the engine is bolted onto the bell housing. If they fail that fast, something must be wrong to cause excessive vibration (timing???). A motor mount is not complicated - a piece of very hard rubber (or some plastic equivalent), and attachment points on the top and bottom.

Last edited by rak299; 07-08-2018 at 03:23 PM..
Appreciate 0
      07-08-2018, 03:49 PM   #17
eraxy
Private
No_Country
12
Rep
79
Posts

Drives: 3
Join Date: Oct 2017

iTrader: (0)

Thanks for that. I will further investigate 🙄
Appreciate 0
      07-08-2018, 08:51 PM   #18
Coast2Coast
Registered
0
Rep
1
Posts

Drives: F31 - BMW 328d
Join Date: Mar 2015
Location: Boston

iTrader: (0)

I understand the motor mounts are designed to shear as a safety feature in the event of a collision.

I had a squeak under the hood that the dealer could not pinpoint for 2 years. Whenever I brought the car in for service they tried unsuccessfully to isolate. (Irritating squeak or rattle at idle - 2 liter diesel kind of rough idle to start with). Finally problem was identified as a broken motor mount. They only replaced one.

That’s when I researched and found the mounts are designed to break/shear for safety reasons and they actually fail quite often. I suspect due to bumpy roads - possibly extreme breaking? Lots of potholes here in boston.
Appreciate 0
      07-13-2018, 11:38 AM   #19
eraxy
Private
No_Country
12
Rep
79
Posts

Drives: 3
Join Date: Oct 2017

iTrader: (0)

Noise while driving:


Noise while changing between R and D


Appreciate 0
      12-26-2018, 10:08 PM   #20
pcking
Private
pcking's Avatar
United_States
88
Rep
69
Posts

Drives: 2014 BMW 320i xDrive
Join Date: Dec 2018
Location: West Babylon, NY

iTrader: (0)

Anyone attempt this by themselves? I had issues with my exhaust rattling and more recently the air intake breaking a clamp, suspect engine movement due to a bad mount. have over 165K miles and think it is time to swap all (3) mounts. But would love to see a video of how to do it on my '14 320i xDrive...
__________________
Mods: Stoptech Sport Brakes, Injen Intake, BMS Catch Can, AFE Downpipe & 328i Sport Exhaust, Evolution Raceworks Chargepipes, VRSF intercooler, AFE tBody Spacer, MHI Big Turbo, BM3 Stage 2 93 Octane tune, Bilstein B8 Sport+ dampers, Dinan Perf Spring Set & Camber Plates
Appreciate 0
      12-27-2018, 07:55 AM   #21
Billfitz
Lieutenant General
Billfitz's Avatar
United_States
8170
Rep
15,966
Posts

Drives: '15 328iX GT
Join Date: Jan 2015
Location: New Hampshire

iTrader: (0)

https://www.newtis.info/tisv2/a/en/f...?q=motor+mount
Appreciate 1
pcking87.50
      12-27-2018, 09:08 AM   #22
pcking
Private
pcking's Avatar
United_States
88
Rep
69
Posts

Drives: 2014 BMW 320i xDrive
Join Date: Dec 2018
Location: West Babylon, NY

iTrader: (0)

Quote:
Originally Posted by Billfitz View Post
Guess I need to stop using tribal knowledge and start looking at the TIS site.

Thanks for the reminder.
__________________
Mods: Stoptech Sport Brakes, Injen Intake, BMS Catch Can, AFE Downpipe & 328i Sport Exhaust, Evolution Raceworks Chargepipes, VRSF intercooler, AFE tBody Spacer, MHI Big Turbo, BM3 Stage 2 93 Octane tune, Bilstein B8 Sport+ dampers, Dinan Perf Spring Set & Camber Plates
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 12:10 AM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST