Motor Mounts
Thread Starter
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,184
Likes: 16
From: Highlands Ranch, Colorado
2014 BMW M235i
Motor Mounts
Hello All,
As many of you know by now my 2007 E550 4Matic has been running quite well for the few months of ownership I have been lucky to possess thus far - however I have a question regarding the M273 engine and it's motor mounts, basically how it should feel on startup.
Let me start by saying I don't believe anything is wrong with the vehicle as it has been religiously serviced since mile 1 from both previous owners but parts just may be getting a bit older. I recently brought the vehicle in on an unrelated maintenance action and everything checked out as being fine.
Anyway my question is this: on startup, cold start or warm start, there is a lot of noticeable torque when I turn the key and the engine starts - not so much that it causes vibration, noise, or anything "bad" "annoying" or "destructive" - but it is noticeable that it exerts force on the frame of the vehicle. Not that it is a problem but I am not too sure how much it is designed to come through to the cabin. It is really the only time I notice this however because under heavy acceleration or normal acceleration it is not an issue, but I want to know if this could indicate any upcoming issues with motor mounts...
Anyone who has an E550 experience what I am talking about? Or is this not normal
.
As many of you know by now my 2007 E550 4Matic has been running quite well for the few months of ownership I have been lucky to possess thus far - however I have a question regarding the M273 engine and it's motor mounts, basically how it should feel on startup.
Let me start by saying I don't believe anything is wrong with the vehicle as it has been religiously serviced since mile 1 from both previous owners but parts just may be getting a bit older. I recently brought the vehicle in on an unrelated maintenance action and everything checked out as being fine.
Anyway my question is this: on startup, cold start or warm start, there is a lot of noticeable torque when I turn the key and the engine starts - not so much that it causes vibration, noise, or anything "bad" "annoying" or "destructive" - but it is noticeable that it exerts force on the frame of the vehicle. Not that it is a problem but I am not too sure how much it is designed to come through to the cabin. It is really the only time I notice this however because under heavy acceleration or normal acceleration it is not an issue, but I want to know if this could indicate any upcoming issues with motor mounts...
Anyone who has an E550 experience what I am talking about? Or is this not normal
.
Senior Member
Joined: Jun 2009
Posts: 268
Likes: 1
From: Northern Virginia
2006 E320CDI
Motor mounts should not be a problem until you get past 75K miles -- It could go 150K before needing replacement and I am sure depends on your driving style and the engine's torque.
You can check by feeling the engine at idle and at the same time see how much vibration is being transmitted to the chassis. With my E320 CDI you can feel the vibration with you hand on the engine cover and then feel the chassis in the engine compartment and there is little to no vibration. Mine were replaced at 90K and you could feel the vibration in the chassis with your hand and also when accelerating especially when turning.
You can check by feeling the engine at idle and at the same time see how much vibration is being transmitted to the chassis. With my E320 CDI you can feel the vibration with you hand on the engine cover and then feel the chassis in the engine compartment and there is little to no vibration. Mine were replaced at 90K and you could feel the vibration in the chassis with your hand and also when accelerating especially when turning.
Last edited by edwinwalke; Apr 27, 2012 at 01:32 PM.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,184
Likes: 16
From: Highlands Ranch, Colorado
2014 BMW M235i
I will look into the service records in more detail to see when that service was done, because I am past the 75,000 mile mark but nowhere near the 150,000 mile mark - the dealership has been good about telling me what is not necessary to replace at this point so I will ask next time I am in.
When the engine is on I do not feel a lot of vibration at idle - not at speed, while turning, or any of the aforesaid but more on startup I don't know if the motor mounts feel as "firm" as they should be so thanks for bringing light to when you replaced your parts so I can research this a bit more.
When the engine is on I do not feel a lot of vibration at idle - not at speed, while turning, or any of the aforesaid but more on startup I don't know if the motor mounts feel as "firm" as they should be so thanks for bringing light to when you replaced your parts so I can research this a bit more.
MBWorld Fanatic!
Joined: Aug 2005
Posts: 3,085
Likes: 59
From: Los Angeles
2009 SL550 Roadster Diamond White, 2008 CLK550 Coupe Obsidian Black
had the trans mount replaced at about 80ki would take that with a grain of salt what they say. the motor mounts are horrible on these cars from what i've read (and experienced)
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
My mounts failed about 85,000 The only car I ever broke mounts on was my 64 corvette after a full throttle burn out. Then they were replaced with safety mounts and never failed again. But for MB to be failing this often,, ???
MBWorld Fanatic!
Joined: Aug 2005
Posts: 3,085
Likes: 59
From: Los Angeles
2009 SL550 Roadster Diamond White, 2008 CLK550 Coupe Obsidian Black
To quote Alfafa on the "lill'e rascles".. Me too !
My mounts failed about 85,000 The only car I ever broke mounts on was my 64 corvette after a full throttle burn out. Then they were replaced with safety mounts and never failed again. But for MB to be failing this often,, ???
My mounts failed about 85,000 The only car I ever broke mounts on was my 64 corvette after a full throttle burn out. Then they were replaced with safety mounts and never failed again. But for MB to be failing this often,, ???
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Junior Member
Joined: Oct 2010
Posts: 28
Likes: 0
2007 E320 Bluetec, 2007 ML320CDI
Motor mounts break. It's that simple. Replaced them on mine at 55k. They are just rubber filled with hydraulic fluid. The rubber deteriorates over time and breaks. I have not owned a car yet, German or American that did not need motor mounts. Most cars that are a few years old need them, people just don't realize it. At 55k, mine were trashed, and I am not a hot rod driver, its just what happens. It made a huge difference. I do live in a hot dry place so that does not help. The rubber dry rots a lot faster. Mercedes has updated the mounts on the W211's with a new design that should last longer.
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MBWorld Fanatic!
Joined: Aug 2005
Posts: 3,085
Likes: 59
From: Los Angeles
2009 SL550 Roadster Diamond White, 2008 CLK550 Coupe Obsidian Black
my opinion is they are not designed well (just do a search and see how much of a common problem it is). i've had only one car with them fail besides this one and it was a 94 S420 at about $150K miles (and only once).
just another thing that was designed bad on this car (suspension components such as ball joints and control arms, airmatic system, SBC system, "glycol contamination" issue, fuel system leaking, etc etc)
just another thing that was designed bad on this car (suspension components such as ball joints and control arms, airmatic system, SBC system, "glycol contamination" issue, fuel system leaking, etc etc)
Junior Member
Joined: Mar 2008
Posts: 18
Likes: 0
From: Austin, TX USA
04 E320
It's a wear item
The cool thing about getting side tracked so many times before actually changing them out is that when I finally did....(took me freaking 7 hours) it felt like I had a totally new benz.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,184
Likes: 16
From: Highlands Ranch, Colorado
2014 BMW M235i
Nice! Well my car hasn't experience any of those issues whatsoever, so I think I am good for now but I will certainly look into it. Thanks for all the information!
Member
Joined: Sep 2011
Posts: 216
Likes: 2
From: Bristol, CT
06 S211 E500 4Matic
Mine failed at 142k... both of them. Apparently, two bolts on the bottom (the ones that secure the engine and the mount to the frame) rusted through and a hard acceleration finished the job. Almost took out the driver side axle because of the rotation of the engine. Will be replacing both of them. Pics of the failed ones are to follow soon.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
my opinion is they are not designed well (just do a search and see how much of a common problem it is). i've had only one car with them fail besides this one and it was a 94 S420 at about $150K miles (and only once).
just another thing that was designed bad on this car (suspension components such as ball joints and control arms, airmatic system, SBC system, "glycol contamination" issue, fuel system leaking, etc etc)
just another thing that was designed bad on this car (suspension components such as ball joints and control arms, airmatic system, SBC system, "glycol contamination" issue, fuel system leaking, etc etc)
Glycol cont issue,
Fuel tank leak
Ball joints failing
SBC
airmatic
and on and on and on............
Member
Joined: Sep 2011
Posts: 216
Likes: 2
From: Bristol, CT
06 S211 E500 4Matic
Pics of the old and new mounts:
As you can see in the second picture, that is where the bolt secures the mount with the engine to the frame. On the old one, part of the bolt is still inside the mount. Other than that, took probably an hour to replace the mounts. Jack up the engine a little bit, undo 2 bolts (one top, one bottom). There is plenty of space to take out the old mounts and put new ones in.
As you can see in the second picture, that is where the bolt secures the mount with the engine to the frame. On the old one, part of the bolt is still inside the mount. Other than that, took probably an hour to replace the mounts. Jack up the engine a little bit, undo 2 bolts (one top, one bottom). There is plenty of space to take out the old mounts and put new ones in.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,184
Likes: 16
From: Highlands Ranch, Colorado
2014 BMW M235i
Good to know that it's something I could *potentially* do myself, however after having spent a few more months with my car I've become used to its feel and how it drives, so as far as mounts go I'm fine for now. Definitely will be using this as a reference though.
