new engine mounts=vibration? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 11-02-2017
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new engine mounts=vibration?

Hi all, Got a question about the engine mounts. The SLK has 98K on her and I noticed some leakage from the right engine mount so I picked up a set to replace and the job wasnt really too bad. The old ones were cracked and I replaced the tranny mount as well. All done and started her up for a test drive and as soon as I went into drive there was a vibration that wasn't there before. I checked the mounts and the top orientation tab was in the slot and the bolts were tight. Are the new mounts normaly stiff and need to "break in" or is there somthing I missed? I also noticed that the vibration is less after a short drive but after sitting for 30 minutes its back agine. Thanks in advance...
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#2 Old 11-03-2017
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Originally Posted by dusters128 View Post
Hi all, Got a question about the engine mounts. The SLK has 98K on her and I noticed some leakage from the right engine mount so I picked up a set to replace and the job wasnt really too bad. The old ones were cracked and I replaced the tranny mount as well. All done and started her up for a test drive and as soon as I went into drive there was a vibration that wasn't there before. I checked the mounts and the top orientation tab was in the slot and the bolts were tight. Are the new mounts normaly stiff and need to "break in" or is there somthing I missed? I also noticed that the vibration is less after a short drive but after sitting for 30 minutes its back agine. Thanks in advance...
Hydraulic mounts dampen (some) vibrations, true. Are you certain that the new mounts are hydraulic? Many aftermarket engine mounts are not, either to save on cost or to remove a point of failure.

That said, new mounts may feel stiffer and transfer more vibrations, just because they are "new and stiff(er)".
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#3 Old 11-03-2017
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The new ones said they were oil filled. It seems strange. I thought the old ones would get stiffer with age.
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#4 Old 11-03-2017
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Originally Posted by dusters128 View Post
The new ones said they were oil filled. It seems strange. I thought the old ones would get stiffer with age.
No, they will not. When they break (leak) they get sloppy and low. You compare with the old ones that were more or less worn out, right?
If the new ones are "oil filled" they are hydraulic (like they should be). (Actually, it is more likely to be water with antifreeze in it, more "rubber friendly" than oil.)

Solid rubber engine mounts may certainly get stiffer with age, but the modern variety keeps up well, until they start to leak (but you already know that).
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#5 Old 11-03-2017
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Can't say with the 170 but we just had the mounts replaced on an 09 350.
Definitely smoother.

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#6 Old 11-03-2017
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Ok is there any way to tell if they are filled or solid? on the outside they look exactly alike. except for the fluid comming out of the old one..
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#7 Old 11-03-2017
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Also is there a right and left? they both look the same and theres no numbers on the mounts at all. Im begining to wonder if these are the wrong type. just looked at the packaging and the bland name is KARL
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#8 Old 11-03-2017
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Originally Posted by dusters128 View Post
Also is there a right and left? they both look the same and theres no numbers on the mounts at all. Im begining to wonder if these are the wrong type. just looked at the packaging and the bland name is KARL
They are not the same, there is a right and left mount. I am certain that you can get help from some forumite with a Mercedes parts catalog, but a quick check here at Pelican Parts may be somewhat enlightening in the meantime.
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#9 Old 11-03-2017
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Although I have no experience of changing the engine mounts, they are definitely left and right specific.


Oh edit !
@Anders S SLK02 is too quick for me
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#10 Old 11-03-2017
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From EPC using your VIN
Definitely a left and right.


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#11 Old 11-03-2017
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Quote:
Originally Posted by Avel Du View Post
From EPC using your VIN
Definitely a left and right.


Agreed that MB spec's two part numbers, but the aftermarket suppliers consistently offer one part for use on either side. Fairly common.
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#12 Old 11-03-2017
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Originally Posted by mchild View Post
Agreed that MB spec's two part numbers, but the aftermarket suppliers consistently offer one part for use on either side. Fairly common.

Aaaaand... what OTHER shortcuts do they take... (Pelican offers differentiated mounts, they may not all be evil) :-)
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#13 Old 11-03-2017
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Quote:
Originally Posted by Anders S SLK02 View Post
Aaaaand... what OTHER shortcuts do they take... (Pelican offers differentiated mounts, they may not all be evil) :-)
The Lemforder brand is OEM. I suspect most of the aftermarket mounts available from the typical US parts distributors are sourced from Chinese manufactures - and of course, buyer beware.
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#14 Old 11-03-2017
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Slacken off the rear gearbox mounting , start the car and let it idle for a while and then nip the bolt/ nut back up and try again.

If you have changed them all at the same time could be a slight chance the engine and box are out of line at the rear depending on how it was all tightened and supported when done .

Worth a try
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#15 Old 11-03-2017
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I have had symptoms the same as you are describing after a motor mount change.

Mine was caused by a defective new mount. I replaced them and all was well.
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#16 Old 11-06-2017
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well that settels it. going to get another set from Lemforder. thanks to Amders,Mchild and Avel for the part numbers. Frogfoot, I tried the slacken idea but there was no change but a sound idea. thanke all ill post update when i get the Lemforders in ..
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#17 Old 11-06-2017
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Originally Posted by dusters128 View Post
well that settels it. going to get another set from Lemforder. thanks to Amders,Mchild and Avel for the part numbers. Frogfoot, I tried the slacken idea but there was no change but a sound idea. thanke all ill post update when i get the Lemforders in ..
Please do, We can come up with ideas from the safety of screens and distance (no risk for us, we don't do the hard work)

you are the one to tell the real story afterwards...
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#18 Old 11-15-2017
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Well I got the Lemforders and installed them in. was a little tighter but no real problem. Also noticed you can rock the engine more than with other set from Karl. Also noticed the left mount was a little softer when compressing by hand than the right. Maby for the differences in engine weight from side to side. Went for a test and right off it was a LOT smoother just going into drive. Defenitly go for the better mounts. Thanks for all the help here.
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