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Vibrations and shaking inside the cabin of a Mercedes Benz

Problem: Interior Vibrations

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Are you feeling vibrations inside the cabin of your Mercedes? Often MB owners feel seat vibrations that can’t be explained because in most cases the car runs great. Vibrations may be felt on the steering wheel or dash and are most noticeable when stopped at a red light.

Troubleshooting

Are these vibrations more noticeable when your car is in Drive or Reverse?

If you answered yes, then most likely you need new engine & transmission mounts. Typically these vibrations are noticed when your car is in Park or Neutral. The vibrations intensify if you move the shifter in Drive or Reverse but keep the vehicle stopped. The majority of cases, the problem is the motor mounts.

Checking if your motor mounts are defective is easy but you need a helper and must be extremely careful.

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CAUTION: Make sure no one is standing on the front or back of the car when you perform this test.

Cause

Bad Engine MountsMercedes-Benz motor mounts are fluid filled instead of rubber mounts that are used on most cars. Mercedes-Benz the engine mounts start to loose fluid around the 100k mile mark. Once a crack develops on the motor mount, they loose all the fluid over time and the vibrations get worse.

Mercedes cars have three mounts. Two on each side of the engine and one at the end of the transmission near the output shaft. The transmission mount is not a fluid filled mount, but just a regular rubber mount. They also do wear out and need to be replaced.

Replacing all three mounts is recommended. Your Mercedes will feel like it just rolled out of the factory. Seriously! Even if your Mercedes has 200k miles, once you install new motor mounts, you won’t feel a single vibration inside the cabin. 

Replacing Mercedes motor mounts

Motor Mounts

Mercedes Benz Engine MountsThe two engine mounts are oil filled. Once you replace these you will think that all of the sudden you got a new car. The difference from the old mounts to the new ones is night and day. These amounts are not that easy to replace. Well, if you don’t have the right tools that is. If you have the Mercedes-Benz tool for engine mounts than this is an easy job as well.

Replacing Mercedes motor mount is an intensive job. It requires that you have a special tool to remove the top bolt on the motor mount. There isn’t much room to access the motor mount. The engine needs to be raised a couple of inches. The job can take a DIYer 2 to 4 hours. We have put together a DIY guide on how to replace the motor mounts that will help you get rid of cabin vibrations.

Transmission mount

transmission mountThe transmission mount is very easy to replace. You simply raise the car, support the transmission with a jack. Remove 4 bolts on the transmission mount and install new. If you change your oil you can do this too. It is actually easier than changing the oil on an MB. Here is a picture of the transmission mount, shown upside down so you can see the location of the bolts. You can get this mount for less about $20 dollars on Amazon, see here.

Where to buy Mercedes motor mount?

The two engine mounts can range from $80-$150 per set. You can get quality ones like these ones, on Amazon for a fraction of dealer prices. These are quality oil filled mounts.

A mechanic may charge between $400-$800 to replace the motor mounts on a Mercedes depending on the Class. In some cases, the exhaust manifold may need to be disconnected in order to pull out the old motor mount.

Driving with failed motor mount is not fun. Driving an old Mercedes with new motor mounts will make you think you got a new car.

 

3 comments

  1. I have a C240, 2004, 2.6L and when turning in a curve to no matter left or right the steering wheel tends to return with staggered movements out of the ordinary, in some cases can be dangerous because it does with enough force.

  2. I OWN A MERCEDES C320 WAGON. APART FROM SOME MINOR CAR ISSUES WHICH MY MECHANIC IS ABLE TO FIX, THE BATTERY KEEPS RUNNING OUT WHENEVER I PARK THE VEHICLE FOR A WHOLE DAY WITHOUT DRIVING IT. WHAT’S THE PROBLEM?

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