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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Check your engine mounts



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      10-07-2016, 08:09 PM   #1
dixy2k
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Check your engine mounts

Took my car in for an unrelated issue. The shop advised me to replace the engine mounts, since both of them have collapsed.

I remember I had one replaced at the dealer a few years ago and never had them checked since.

2011 model, currently 116,700 miles.
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      07-23-2018, 12:00 AM   #2
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Quote:
Originally Posted by dixy2k View Post
Took my car in for an unrelated issue. The shop advised me to replace the engine mounts, since both of them have collapsed.

I remember I had one replaced at the dealer a few years ago and never had them checked since.

2011 model, currently 116,700 miles.
cost?
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      07-23-2018, 12:31 PM   #3
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Quote:
Originally Posted by Chief Orman View Post
cost?
About $250 for parts if you get both from FCPEuro. Labor is easy.
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      07-23-2018, 05:30 PM   #4
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Quote:
Originally Posted by dixy2k View Post
Took my car in for an unrelated issue. The shop advised me to replace the engine mounts, since both of them have collapsed.

I remember I had one replaced at the dealer a few years ago and never had them checked since.

2011 model, currently 116,700 miles.
I wonder how they look when they are collapsed? I looked at mine the other day and thought they looked okay but wanted to do a vacuum test to make sure they hold vacuum.
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      07-31-2018, 03:19 PM   #5
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What are the symptoms of faulty mounts?
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      07-31-2018, 04:08 PM   #6
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Originally Posted by Dazza335iC View Post
What are the symptoms of faulty mounts?
Most common and obvious one is a grinding or rubbing noise from the front right corner of the car when accelerating hard while turning left. Many mistake it for wheel rub or a bad hub bearing.
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      08-02-2018, 09:54 PM   #7
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Quote:
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What are the symptoms of faulty mounts?
Increased vibrations are also a symptom
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      08-06-2018, 03:11 PM   #8
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When my 335d went in for a recall, the dealership told me that both of my engine mounts need to be replaced but I don't have any of the symptoms. No rubbing sound or vibrations.
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      08-06-2018, 10:31 PM   #9
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I am also very curious what a collapsed engine mount looks like.
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      08-07-2018, 10:06 PM   #10
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Quote:
Originally Posted by PhotoGuy87 View Post
When my 335d went in for a recall, the dealership told me that both of my engine mounts need to be replaced but I don't have any of the symptoms. No rubbing sound or vibrations.
I wonder if they’re giving you a line? What is your mileage?
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      08-09-2018, 06:40 AM   #11
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I wonder if they’re giving you a line? What is your mileage?
I'm currently at 95k miles but I bet it wouldn't be a bad idea to replace them when I do deletes since I am right there.
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      08-10-2018, 08:02 AM   #12
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Quote:
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I'm currently at 95k miles but I bet it wouldn't be a bad idea to replace them when I do deletes since I am right there.
This. You will have one of them out already to perform the delete.
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      08-12-2018, 09:08 PM   #13
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Replaced my passenger mount this weekend. Didn't know I was supposed to do both. It was collapsed...not easily identifiable without the two side by side and I didn't take any pictures. I had the "clicking when accelerating and turning left" issue.



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      08-14-2018, 06:28 PM   #14
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I'm expecting mine to look like that as well when I replace them this weekend. My car is making a noise on hard left turns. 109k on the odometer, so I suppose they are due. Just got a new set of engine mounts and trans mounts from FCPEuro delivered this afternoon. Can't wait to get my car back in shape.
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      08-14-2018, 11:48 PM   #15
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Quote:
Originally Posted by PhotoGuy87 View Post
When my 335d went in for a recall, the dealership told me that both of my engine mounts need to be replaced but I don't have any of the symptoms. No rubbing sound or vibrations.
If this was Momentum on Southwest Freeway, this is a favorite money maker of theirs. I'm not saying you don't need mounts, but I replaced mine, brought my car to them for other reasons and had them tell me they needed to be replaced again. I advised them that the mounts were already new, and they quickly backed off. On my next visit, I got the same line.

I imagine they'll also try to tell you that you need a new oil pan gasket at some point. That's their second favorite money maker. They added comments to two of my invoices "customer notes oil droplets in driveway" without my ever telling them such a thing... and then tried to sell me a new oil pan gasket on the third visit, after establishing a "record" so that they could attempt to submit a warranty claim.

The Houston dealers just don't know these cars--the indys are going to be much nicer to your diesel, in my opinion.
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      08-15-2018, 12:15 AM   #16
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Quote:
Originally Posted by Evergreen24 View Post
If this was Momentum on Southwest Freeway, this is a favorite money maker of theirs. I'm not saying you don't need mounts, but I replaced mine, brought my car to them for other reasons and had them tell me they needed to be replaced again. I advised them that the mounts were already new, and they quickly backed off. On my next visit, I got the same line.

I imagine they'll also try to tell you that you need a new oil pan gasket at some point. That's their second favorite money maker. They added comments to two of my invoices "customer notes oil droplets in driveway" without my ever telling them such a thing... and then tried to sell me a new oil pan gasket on the third visit, after establishing a "record" so that they could attempt to submit a warranty claim.

The Houston dealers just don't know these cars--the indys are going to be much nicer to your diesel, in my opinion.
And that's why I'll always do my own service, unless its some free warranty or recall parts. I absolutely refuse to be shaken down.
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      08-16-2018, 12:21 PM   #17
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Quote:
Originally Posted by Evergreen24 View Post
If this was Momentum on Southwest Freeway, this is a favorite money maker of theirs. I'm not saying you don't need mounts, but I replaced mine, brought my car to them for other reasons and had them tell me they needed to be replaced again. I advised them that the mounts were already new, and they quickly backed off. On my next visit, I got the same line.

I imagine they'll also try to tell you that you need a new oil pan gasket at some point. That's their second favorite money maker. They added comments to two of my invoices "customer notes oil droplets in driveway" without my ever telling them such a thing... and then tried to sell me a new oil pan gasket on the third visit, after establishing a "record" so that they could attempt to submit a warranty claim.

The Houston dealers just don't know these cars--the indys are going to be much nicer to your diesel, in my opinion.

scoundrels!

I highly doubt a "collapsed" engine mount is a thing.

I always thought the vacuum mechanism has an internal operation that does not raise or lower the mount at all. it simply increased or decreases dampening in a way that is not obvious by doing a visual inspection.

Unless a vacuum test was applied or a road test gives it away I don't see how that claim can be made.
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      08-16-2018, 03:13 PM   #18
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Quote:
Originally Posted by rkstar9 View Post
scoundrels!

I highly doubt a "collapsed" engine mount is a thing.

I always thought the vacuum mechanism has an internal operation that does not raise or lower the mount at all. it simply increased or decreases dampening in a way that is not obvious by doing a visual inspection.

Unless a vacuum test was applied or a road test gives it away I don't see how that claim can be made.
Well sit back, because you're about to get schooled.

These are not your standard Chevy Cavalier engine mounts...these are very technical, multi-range engine vibration control device.

Cut off the end and you'll find the vacuum canister that does control the "preload" on the hydraulic damping system.





Go deeper and you'll open up the hydraulic chamber, complete with the fluid control "valving." Interesting that they're not using glycol and it's a very runny oil, so I'm going to guess that it's close to suspension fluid (I worked for one of the largest manufacturers of engine/trans/etc mounts, and we only ever used glycol in the fluid damper systems).




Go back to the top and you'll see the rubber has in fact collapsed about 10mm. Since I don't have access to a bandsaw and don't feel like cutting it down with a grinder at the moment, we're going to have to assume there is a quality issue/design flaw with the housing/rubber support that breaks. I will update when I cut the housing open (system is assembled and the aluminum is rolled over the rubber element).

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      08-21-2018, 04:45 PM   #19
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Very nice awenthol! I like when people do investigative work and come around with qualified technical knowledge. If you can share any more technical insight on how these work, that would be greatly appreciated.
I took pictures of my mounts the other day and it looked like the right mount is a little lower than the left one but both still hold vacuum and are a little distance away from sitting on the rubber stops. My car is at 142kmiles
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Last edited by Mik325tds; 08-21-2018 at 05:21 PM..
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      08-25-2018, 01:37 PM   #20
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Just had mine one (thanks Kevin at Aktiv!) at 113K. Irritating cabin vibration is now gone, car feels much "tighter."
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      08-27-2018, 12:23 AM   #21
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Just replaced my motor and tranny mounts this weekend. Took about 4 hours total from start to bonnet closed and tools all put away. Here's a few links of the old vs new parts for comparison (new is on the left). The drive side mount was worn, but not riding on the bump stop. The passenger side, however, was shot and riding on the stop. This combination resulted in the increased vibration felt in the car, and very noticeable noise when taking hard left turns under power/speed. The old tranny mounts looked and felt fine to me, but I replaced them anyhow since I was there and had the parts on hand. They are only $7 each for the Lemforder tranny mounts anyhow.
Also replaced the vacuum lines, since I had the opportunity and the new factory vacuum line on hand.
The car is like new again. This project was worthwhile and yielded some satisfying results. My car has 109k miles on it by the way. If you're over 100k, I'd recommend looking at replacing your mounts soon.

Driver Side: https://photos.app.goo.gl/CAQkY1R3qHNMdVaX6

Passenger Side: https://photos.app.goo.gl/Ki6VvMJTyhC1HUAP6

Tranny Mounts: https://photos.app.goo.gl/VemxFyjHJjC8B9yL8
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      08-27-2018, 02:33 AM   #22
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just replaced mine today. So glad for the info on this forum. While under the car I noticed my struts are leaking so ill be upgrading those soon too. 95k miles.
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