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Motor & transmission mounts replaced at 46K miles
Thread Starter
Member
Joined: Apr 2008
Posts: 199
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2007 R320 CDI, 2010 FJ Cruiser, CTS-V
Motor & transmission mounts replaced at 46K miles
I had the motor and transmission mounts replaced on my 2008 S550 4Matic this week. Last two months, I felt a vibration between 1200-1700 RPM while accelerating and also while coming to a stop.
It was covered under CPO Warranty. The tech noted that all four mounts were completely collapsed.
I hope the new mounts are of a better design.
It was covered under CPO Warranty. The tech noted that all four mounts were completely collapsed.
I hope the new mounts are of a better design.
Super Member
Joined: Dec 2002
Posts: 516
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From: Iowa
'03 G500, '11 S550 4Matic, '12 SL63 AMG, '13 ML350, '16 AMG GTS Ed. 1
Have the new mounts eliminated the vibration? I'm wondering how do you differentiate between bad motor mounts vs. bad tranny mounts? Can a tech determine with a visual inspection? Or do you simply replace both motor and tranny mounts at the same time?
Senior Member
Joined: Jul 2010
Posts: 386
Likes: 3
From: Wisconsin
CL550 1976 450 SL
2007 4matic w/ 76000 miles. I replaced motor mounts and trans. mounts some time ago at my expense.
Still vibration in steering when when put into gear, coming to a stop and while idling at a stop light. Shift to neutral and it stops. I am still frustrated.
Still vibration in steering when when put into gear, coming to a stop and while idling at a stop light. Shift to neutral and it stops. I am still frustrated.
Thread Starter
Member
Joined: Apr 2008
Posts: 199
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2007 R320 CDI, 2010 FJ Cruiser, CTS-V
After you get them off the car and look at them side by side you can definitely tell.
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Joined: Dec 2002
Posts: 516
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From: Iowa
'03 G500, '11 S550 4Matic, '12 SL63 AMG, '13 ML350, '16 AMG GTS Ed. 1
So em bee lover, have you continued your quest to eliminate the vibration? If so, what did you do next? Also, what was the cost of replacing both sets of mounts?
fstshrk, I was curious if you thought the cause of the vibration was from motor mounts, tranny mounts or a combination of both?
fstshrk, I was curious if you thought the cause of the vibration was from motor mounts, tranny mounts or a combination of both?
Thread Starter
Member
Joined: Apr 2008
Posts: 199
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2007 R320 CDI, 2010 FJ Cruiser, CTS-V
I can confirm that replacement of the motor and transmission mounts completely cured all vibration problems on my car.
I think the fix is to replace all of them. I think failure of one causes the failure of the other eventually.
I think the fix is to replace all of them. I think failure of one causes the failure of the other eventually.
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Senior Member
Joined: Jul 2010
Posts: 386
Likes: 3
From: Wisconsin
CL550 1976 450 SL
Brian--
I am tolerating the vibrations, unfortunately. The ones removed truly were crushed and very perceptibly "less in height" than those removed. Mine are identical to fstshrk's post....vibration in steering when putting in driver or reverse and while coming to a stop, as in a stop light setting. As I posted, if I put the trans. in neurtal, the vibration goes away. Verry frustrating.
I was out of warr. when work done. My trusted indi bought the fronts from an authorized MB dlr. and installed for about $400. The trans. was done later.
The only thing I can guess is the dlr. had mounts in stock that were the original version and not the MB released "fixed" ones. I have been trying to get the part number of those shipped from the dlr. Getting run around.
The net is if the engine mounts installed are the new and improved, not the originals, that was not the anwser to my vibration issues.
I am tolerating the vibrations, unfortunately. The ones removed truly were crushed and very perceptibly "less in height" than those removed. Mine are identical to fstshrk's post....vibration in steering when putting in driver or reverse and while coming to a stop, as in a stop light setting. As I posted, if I put the trans. in neurtal, the vibration goes away. Verry frustrating.
I was out of warr. when work done. My trusted indi bought the fronts from an authorized MB dlr. and installed for about $400. The trans. was done later.
The only thing I can guess is the dlr. had mounts in stock that were the original version and not the MB released "fixed" ones. I have been trying to get the part number of those shipped from the dlr. Getting run around.
The net is if the engine mounts installed are the new and improved, not the originals, that was not the anwser to my vibration issues.
Banned
Joined: Jul 2007
Posts: 84
Likes: 9
From: Djibouti
I6 and V6 Diesels
Replaced my motor mounts at 41K, and idle vibration is gone. Replaced my tranny mount at 45K and vibration at 60-70mph is mostly gone (all under warranty). I am now at 70K and still vibration free. Sometimes I think I feel something at 60-70 mph, even on my newest tires, but my family thinks I'm crazy. I think $400-500 per job is about right, if I recall, but my indi saves me about 20-30% over dealer and he always uses OEM parts.
Super Member
Joined: Dec 2002
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From: Iowa
'03 G500, '11 S550 4Matic, '12 SL63 AMG, '13 ML350, '16 AMG GTS Ed. 1
Thank you! I am waiting for my indie to get a quote put together. I think I may just go ahead and have it done, preventively, as the vibrations are not bad at all now...but noticeable. I just can't help but think they are there for a reason other than keeping the driver from feeling the vibrations...like prematurely adding to the stress of both the motor and tranny.
Thanks again!
Thanks again!
Senior Member
Joined: Jul 2010
Posts: 386
Likes: 3
From: Wisconsin
CL550 1976 450 SL
I have been digging for more info.
Here's something that may be appropriate to all w/ vibrations.
P-B-22.10/01a AUG07 – 221.186 (4-Matic) up to VIN A127497; Humming/vibrations in the engine rpm range from 1200 to 1600 (clearly felt in the steering wheel and footwell floor), the dealer will install optimized engine mounts (part # A221 240 08 17).
My vin ends in 117123.
Thought I'd share.
Here's something that may be appropriate to all w/ vibrations.
P-B-22.10/01a AUG07 – 221.186 (4-Matic) up to VIN A127497; Humming/vibrations in the engine rpm range from 1200 to 1600 (clearly felt in the steering wheel and footwell floor), the dealer will install optimized engine mounts (part # A221 240 08 17).
My vin ends in 117123.
Thought I'd share.
Super Member
Joined: Dec 2002
Posts: 516
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From: Iowa
'03 G500, '11 S550 4Matic, '12 SL63 AMG, '13 ML350, '16 AMG GTS Ed. 1
Great info...yep, thats me! My VIN, vibration, 1200-1600 rpm...exactly! Thank you for the appropriate part number, that's huge!
Is that part nunber for all three mounts? Or do you happen to know if there are three different mount part numbers? One for each mount?
Great info, thank you!
Is that part nunber for all three mounts? Or do you happen to know if there are three different mount part numbers? One for each mount?
Great info, thank you!
Last edited by brianw430; Mar 14, 2013 at 05:11 PM.
Newbie
Joined: Aug 2014
Posts: 8
Likes: 0
From: Portland OR
S550 4MATIC
Brian--
I am tolerating the vibrations, unfortunately. The ones removed truly were crushed and very perceptibly "less in height" than those removed. Mine are identical to fstshrk's post....vibration in steering when putting in driver or reverse and while coming to a stop, as in a stop light setting. As I posted, if I put the trans. in neurtal, the vibration goes away. Verry frustrating.
I was out of warr. when work done. My trusted indi bought the fronts from an authorized MB dlr. and installed for about $400. The trans. was done later.
The only thing I can guess is the dlr. had mounts in stock that were the original version and not the MB released "fixed" ones. I have been trying to get the part number of those shipped from the dlr. Getting run around.
The net is if the engine mounts installed are the new and improved, not the originals, that was not the anwser to my vibration issues.
I am tolerating the vibrations, unfortunately. The ones removed truly were crushed and very perceptibly "less in height" than those removed. Mine are identical to fstshrk's post....vibration in steering when putting in driver or reverse and while coming to a stop, as in a stop light setting. As I posted, if I put the trans. in neurtal, the vibration goes away. Verry frustrating.
I was out of warr. when work done. My trusted indi bought the fronts from an authorized MB dlr. and installed for about $400. The trans. was done later.
The only thing I can guess is the dlr. had mounts in stock that were the original version and not the MB released "fixed" ones. I have been trying to get the part number of those shipped from the dlr. Getting run around.
The net is if the engine mounts installed are the new and improved, not the originals, that was not the anwser to my vibration issues.
Senior Member
Joined: Jul 2010
Posts: 386
Likes: 3
From: Wisconsin
CL550 1976 450 SL
Did you manage your problem? Frankly, no. MB dlr. folks can't define/diagnose, local indi is tired of me whining. I left info/bulletins w/ him that addressed relieving the "tension" between engine and trans., loosening this, relaxing that. It has 90,000 on it. Hit dlr. lot 8 yrs. ago. Long answer is I put my mind on ignore at stop lights etc. Shouldn't have to w/ this level of vehicle. kinda disheartening, but mostly frustrating.
Senior Member
Joined: Jan 2015
Posts: 424
Likes: 8
I'm your huckleberry
Brian--
I am tolerating the vibrations, unfortunately. The ones removed truly were crushed and very perceptibly "less in height" than those removed. Mine are identical to fstshrk's post....vibration in steering when putting in driver or reverse and while coming to a stop, as in a stop light setting. As I posted, if I put the trans. in neurtal, the vibration goes away. Verry frustrating.
I am tolerating the vibrations, unfortunately. The ones removed truly were crushed and very perceptibly "less in height" than those removed. Mine are identical to fstshrk's post....vibration in steering when putting in driver or reverse and while coming to a stop, as in a stop light setting. As I posted, if I put the trans. in neurtal, the vibration goes away. Verry frustrating.
Super Member
Joined: Dec 2005
Posts: 806
Likes: 27
From: Rochester, NY
2009 S550 AMG sport pckg. 2014 Ford F-150 Lariat Supercrewcab
After replacing the motor/tranny mounts and doing a throttle body relearn my car now runs silky smooth at idle or in gear. Try a throttle valve relearn, it worked wonders for me. Has to be done using DAS/SD. After doing the mounts they eliminated 90% of the vibrations, and the relearn did the rest.
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Joined: Jan 2015
Posts: 424
Likes: 8
I'm your huckleberry
After replacing the motor/tranny mounts and doing a throttle body relearn my car now runs silky smooth at idle or in gear. Try a throttle valve relearn, it worked wonders for me. Has to be done using DAS/SD. After doing the mounts they eliminated 90% of the vibrations, and the relearn did the rest.
My car is 2013, Em Bee Lover's is 2007. In terms of drivetrain, the two cars are vastly different, especially the engine (therefore motor mounts). And although the transmissions are similar, I'm sure there are design changes also. It puzzles me that a few of us are experiencing very similar symptoms.
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Joined: Dec 2004
Posts: 4,268
Likes: 253
New motor mounts should eliminate vibrations regardless if the are new or old version parts. Continued vibrations in gear at rest are usually indication of low rpms ie throttle body dirt, lack of relearned throttle body and/ or engine adaptations/ harmonization. It might be also carbon buildup.
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Joined: Jan 2015
Posts: 424
Likes: 8
I'm your huckleberry
New motor mounts should eliminate vibrations regardless if the are new or old version parts. Continued vibrations in gear at rest are usually indication of low rpms ie throttle body dirt, lack of relearned throttle body and/ or engine adaptations/ harmonization. It might be also carbon buildup.
I live in California, so my dealer has not seen many 4Matic S550s. I know it took them a good part of the day to replace the mount and they realigned the car afterwards. This tells me that they had to touch some steering components to do the job.
Among all the causes already listed, the symptoms were also consistent with a marginal torque converter. The vibration felt like a chatter. Interestingly, I was given a TSB that described early W221s with bad TCs that had a vibration problem. I'm just glad it was not the transmission.
