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DIY How to replace transmission mount Mercedes-Benz

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Introduction

If you have been experiencing vibration inside the cabin of your Mercedes-Benz then your engine or transmission mounts may have failed. Typically the vibrations are worse at idle and may be less noticeable when driving. In this repair guide we will show you how to replace the automatic transmission mount. Replacing the transmission mount is easy and you can change it in less than an hour. When it comes to motor mounts do not replace them with used parts.

Make:Mercedes-Benz
Model:E CLA SLK ML S Class
Years:1998 1999 2000 01 02 03 04 05 06 07 08 09 2010 11 12 13 15
Difficulty:Easy
DIY Cost$15-$45
Dealer Cost$300-$500
Time:45 Minutes

Preparation

transmission_mount_replacement_DIY_Change_16Make sure to secure the car with jack stands, do not rely on the jack only.  When you remove the transmission mount note the orientation of the mount. The transmission mount fits only in one direction.  The center of the mount is slightly shifted by design as shown in this picture.

Parts & Tools Required

You will need a new transmission mount. We don’t recommend installing used transmission mount because even though the mount may look in good shape it doesn’t mean it is. The rubber will loose elasticity over the years and it will transmit the vibration from the transmission to the chassis and therefore the cabin.  You can find a new transmission mount for as low as $20 even the OEM, check out these Amazon listings for example.

Other than a standard set of socket and your typical tools you don’t need anything else other than a torque wrench.

Do It Yourself Repair Instructions

Raise Vehicle

Raise vehicle using the jack that came with your car or even better use an aluminum jack. Make sure to secure the car by placing jack stands underneath. No not work under the car that is not supported by jack stands. The other option would be to user vehicle ramps

Locate transmission mount

The transmission mount is located at the middle of the vehicle. You may not be able to see it if the car has an undercarriage plastic cover also known as splash shield.

Remove undercarriage plastic cover / splash shield

You will need to remove about 6 screws to remove the splash shield. Use a 8 mm socket to remove the bolts shown in the picture. Typically Mercedes-Benz have three splash shields. You need to remove the last one. The first one is near the front bumper and the last one is the transmission splash shield towards the middle of the car.

Remove two bolts to supporting bracket

Remove the two bolts shown in the picture using your 13 mm socket. You do not need to support the transmission at this point.

Support Transmission

Use a block of wood to place under the transmission and raise until the transmission mount raises about 1/4 inch from the suppport bracket.

Remove two bolts on the transmission mount

Remvoe the 16mm bolts that connect the mount to the transmission. Once these two bolts are removed you will be able to remove the old transmission mount and install the new.

Install new transmission mount

Place the new transmission mount at the end of the transmission and torque the bolts to 50 Nm using a torque wrench.






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Install the two 13 mm bolts.

Slowly lower the transmission. Make sure that the two holes line up so that you will be able to bolt the two bolts that tie the transmission mount to the support bracket. Torque the two 13 mm bolts to approximately 25 ft lbs.

Install the splash shield / undercarriage plastic cover.

Reinstall the undercarriage plastic cover by fastening the 8 mm bolts. Then lower the vehicle.

You are done. Congratulations!

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Frequently Asked Questions

Symptoms of a failed Engine or Transmission Mount

The #1 symptom of a failed transmission mount is vibration in your seat and cabin. Other symptoms include:

  • Excessive engine and transmission movement when changing gears.
  • Noise or thump when you place engine in gear.
  • Vibration at idle or when accelerating.

How often should I change the engine or transmission mounts?

The engine and transmission mounts are not part of regular maintenance, meaning that typically then don’t need to checked or replaced on a regular basis. With that said Mercedes-Benz engine and transmission mounts seem to fail between 80,000 and 120,000 miles. That’s when most owners start experiencing the vibrations on the steering wheel, inside the cabin or on their seat with the vibrations being the most noticeable when stopped at a light.

Should I replace the engine mounts at the same time as replacing the transmission mount?

If you are feeling vibration in your seat, steering wheel or cabin you should replace the two engine mounts and the transmission mount as well. You may replace the defective one but the other mounts will not last very long if left in place.

How long does it take to replace the engine / transmission mounts?

An experienced mechanic should be able to do the job in less than 2 hours. If any mechanic charges more than 3 hours of labor to replace the two engine mounts and one transmission mount than they are taking too long. If you doing it yourself for the first time give yourself 4 or 5 hours.

Replacing the transmission mount only can be done in 20 minutes by an experienced mechanic familiar with Mercedes-Benz cars. Even though you will most likely get charged for one hour of labour.  First time Do It Yourself it can take up to one hour.

First time Do It Yourself it can take up to one hour.

What is the best / recommended brand for Mercedes-Benz motor and transmission mounts?

Our recommended brand for the motor and transmission mount is LEMFORDER. It is the same brand and exact same OEM part that the Mercedes-Benz use. You can find LEMFORDER motor mounts on Amazonfor much less than what the what the dealer charges.

Applicable Models and Part Number

Related Part Numbers:

  • 220 240 0518
  • 212 240 0418
  • 209 211 215 220 230
  • 2200617  220 240 02 18
  • 2202400218
  • 2 20 24 00418,2 20 24 00218
  • 2 12 24 00418,2 20 24 00518
  • AM-2878323111

These instrcutions are very similar for the following years and models:

1997-00 Mercedes-Benz C230
2003-05 Mercedes-Benz C240
2001-02 Mercedes Benz C240
1998-00 Mercedes Benz C280
2002-04 Mercedes Benz C32 AMG
2003-05 Mercedes Benz C320
2001-02 Mercedes Benz C320
1997 Mercedes Benz C36 AMG
1998-00 Mercedes Benz C43 AMG
2005-06 Mercedes Benz C55 AMG
1998-05 Mercedes Benz CL500
2001-05 Mercedes Benz CL55 AMG
1998-05 Mercedes Benz CL600
2005 Mercedes Benz CL65 AMG
1998-05 Mercedes Benz CLK320
2006-09 Mercedes Benz CLK350
1999-02 Mercedes Benz CLK430
2003-05 Mercedes Benz CLK500
2001-05 Mercedes Benz CLK55 AMG
2007-09 Mercedes Benz CLK550
1997 Mercedes Benz E300
1997-09 Mercedes Benz E320
1997 Mercedes Benz E420
2000-02 Mercedes Benz E430
1998-99 Mercedes Benz E430
2003-05 Mercedes Benz E500
1999-05 Mercedes Benz E55 AMG
2002-08 Mercedes Benz G500
2003-04 Mercedes Benz G55 AMG
1997-99 Mercedes Benz S320
1996-99 Mercedes Benz S420
2003-05 Mercedes Benz S430
2000-02 Mercedes Benz S430
2003-05 Mercedes Benz S500
1996-02 Mercedes Benz S500
2001-05 Mercedes Benz S55 AMG
1996-05 Mercedes Benz S600
1997 Mercedes Benz SL320
1997 Mercedes Benz SL320
2003-05 Mercedes Benz SL500
1996-98 Mercedes Benz SL500
2003-05 Mercedes Benz SL500
1996-98 Mercedes Benz SL500
2003-05 Mercedes Benz SL55 AMG
1996-00 Mercedes Benz SL600
1998-04 Mercedes Benz SLK230
2002-04 Mercedes Benz SLK32 AMG
2001-04 Mercedes Benz SLK320

Torque Specifications

  • 16 mm bolts between the transmission and the mount- 35ft-lb.
  • 13 mm bolts between the mount and the support bracket -25 ft-lb.

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