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E320 wagon oscillating vibration

WFR817
Sun, 21 Feb 2021 05:48:45 GMT

Im trying to chase down a sort of oscillating vibration on a 02 E320 wagon. New tires, road force balanced, good motor and transmission mounts, replaced front driveshafts all is tight but I'm getting this weird vibration that is kind of high pitched and goes in and out. It's speed related as it will do it in neutral and is a higher frequency vibration than the tire speed . Any ideas?

merrill
Sun, 21 Feb 2021 14:00:17 GMT

i would suggest checking any and all suspension bushings or subframe bushings,

Alex
Sun, 21 Feb 2021 17:39:32 GMT

If you still have it when the transmission is in neutral, and it's not the wheels, then it's related to the drive shaft or differential.

190E fan
Sun, 21 Feb 2021 18:04:07 GMT

I would also suggest checking the wheel bearings just to rule them out as well as a bad wheel bearing can also have a high pitched sound.

merrill
Wed, 24 Feb 2021 01:00:14 GMT

does the noise change if there is a heavy load in the rear of the car? if so then i'd focus on bushings

WFR817
Tue, 09 Mar 2021 19:34:45 GMT

Its, not the bearings, it still happens in neutral, replaced bad front drive shaft, NOT the rear drive shaft so it's got to be the differential I guess

190E fan
Wed, 10 Mar 2021 05:26:53 GMT

Would it be possible for you to post a driving video with the car making the noise you describe? That might help us to be able to help you identify the noise and come up with a diagnosis.

merrill
Wed, 10 Mar 2021 14:14:25 GMT

hi, i went down this same rat hole with my 300d, the dealership nor and independent mb shop could figure it out, replaced the axles, differential, complete drives shaft w bearing and both rear axle bearings, sub frame bushings and diff mount. the only thing left is the 42 year old trailing arm bushings. i found when i had a lot of weight in the trunk the noise would go away, the other thing that is pointing to the trailing arm bushings is the position of the rear wheels in relation to the wheel arch, its obvious one side is not tracking the same as the other side. i'd still recommend loading up the rear of the car to change the suspension angles and see if the noise goes away or changes.

WFR817
Fri, 12 Mar 2021 20:02:21 GMT

Had the car up on a lift and got the same vibration at speed. Checked all bushings, axles, half shaft. Differential was solid and I still had the vibration. Bizarre

merrill
Sat, 13 Mar 2021 15:41:02 GMT

hi, i did the same with my 300d, before you spend a bunch of money on rotating parts check your bushings. trailing arm , subframe. also. load up the rear end so it sags and then drive the car, if the noise changes or goes away bushings are suspect

WFR817
Sun, 21 Mar 2021 03:34:24 GMT

Had a load of Duraflame logs in the back yesterday so it was weighted down, no effect on the harmonic vibration. The only thing that make sense at this point are the half shafts, I'm struggling whether to replace those or move on and sell the car. If I could be assured that the axels are the problem I'd do it but it's an expensive roll of the dice.

merrill
Mon, 22 Mar 2021 12:38:25 GMT

on your model car can you swap the axles left to right to see if there is a change in vibration? if so the folks at this link may be able to inspect and possibly rebuild yours or sell you a good used pair https://www.dieselmercedes.com/productslist.asp

WFR817
Fri, 16 Apr 2021 04:53:17 GMT

interesting idea thank you.