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Pelican Technical Article:

Engine Mount Replacement

Time:

1 hour1 hr

Tab:

$230

Talent:

***

Tools:

17mm wrench, 13mm socket with extension, floor jack

Applicable Models:

Mercedes-Benz W210 (1996-03)

Parts Required:

New engine mounts

Hot Tip:

Make sure you support the engine correctly when replacing the mounts

Performance Gain:

Smooth drivetrain

Complementary Modification:

Replace transmission mount

The engine mounts on a car are the direct mechanical connection holding the engine to the chassis. Almost all engine mounts have a rubber portion that allows a small amount of flex to reduce vibrations from the engine. If the engine was just directly bolted to the chassis, you would feel every vibration from the engine much more amplified throughout the car while driving.

The rubber portion of the engine mount is particularly susceptible to failure due to the conditions of the engine bay. Heat and oil can take its toll on the mount, causing the rubber portion to crack and separate. When this happens, the mount collapses and no longer supports the engine correctly. Replacement is easy and should only take an hour.

Begin by jacking the car up and securing it on jackstands. NEVER rely on a floor jack to hold the car up. Doing so only invites the possibility for a serious accident. Next, remove the panel on the front of the right rear passenger seat. Underneath you'll see a disconnect point for the battery ground. We will be working around the starter which has a live 12V feed going to it. If you happen to touch this while working on the car, you can damage the electrical system as well as yourself. Be safe, disconnect the lead.

Shown here is a new mount for the W210 Mercedes with the M104 engine.
Figure 1

Shown here is a new mount for the W210 Mercedes-Benz with the M104 engine. If your mounts have failed, Pelican Parts has them in stock.

Shown here is the battery disconnection port on the W210 Mercedes.
Figure 2

Shown here is the battery disconnection port on the W210 Mercedes-Benz. It is located on the front of the rear right passenger seat. Pry off the plastic cover and remove the 11mm nut holding the contact to the terminal. Once the terminal is removed, the battery is disconnected.

Shown here is the location of the two engine mounts (green arrows) looking up at the bottom of the car.
Figure 3

Shown here is the location of the two engine mounts (green arrows) looking up at the bottom of the car. The first step is to loosen and remove the 13mm bolt that holds the mount in place on the lower cross-member. These are located inside the two access holes shown here (purple arrows). Don't worry about the engine shifting position. The weight of the engine will keep the mount in place. I recommend that you change one mount at a time. In this case, we will start with the right side.

Next, remove the 17mm bolt at the top of the mount (green arrow).
Figure 4

Next, remove the 17mm bolt at the top of the mount (green arrow). I've been told that on earlier cars, this can also be a 16mm bolt.

Place a floor jack under the oil pan of the engine with a block of wood or rubber between the jack and the pan.
Figure 5

Place a floor jack under the oil pan of the engine with a block of wood or rubber between the jack and the pan. This helps to protect the pan from damage. Now jack the engine up gently until you can remove the mount from in between the engine and cross member.

You'll notice a small tab cast into the mount (green arrow).
Figure 6

You'll notice a small tab cast into the mount (green arrow). This tab centers the mount on the mount arm.

Place the new mount on the cross member and loosely thread the 13mm bolt in at the bottom.
Figure 7

Place the new mount on the cross member and loosely thread the 13mm bolt in at the bottom. We just want to hold it in place with some wiggle room. Now rotate the mount until the small tab at the top lines up with the slot in the mount arm on the engine (green arrow). Place the 17mm bolt through the top of the engine mount arm and into the new mount. Thread it in by hand and carefully lower the engine back down onto the new mount. Torque the top bolt to 55 Nm/40ft.-lbs and the bottom one to 25 Nm/18ft.-lbs. You may find it difficult to fit a torque wrench inside the engine bay to get at the top bolt. I'd just tighten it down as much as you can by hand.

The left side mount is a little more difficult to replace due to the heat shield directly above the mount.
Figure 8

The left side mount is a little more difficult to replace due to the heat shield directly above the mount. Begin removal by first removing the lower 13mm bolt and reaching above the heat shield to remove the upper 17mm bolt. You wont be able to pull the bolt out of the mount arm due to the exhaust manifold being in the way (green arrow). Instead, you'll have to jack the motor up far enough to lift up on the bolt by hand while you pull the old mount out. Pull the bolt up when installing the new mount. Once you position the centering tab in the mount arm, lower the engine down and re-install the lower mounting bolt. Torque the top bolt to 55 Nm/40ft.-lbs and the bottom one to 25 Nm/18ft.-lbs Now just re-connect the battery and lower the car. You're all done.

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Comments and Suggestions:
MrsFixIt Comments: I'm interested in doing this repair, however, I'm a tad confused. The article says the "applicable models are 96-03", your responses to others with model questions say 96-97. Just to be sure, I have a 1999 e320 W210, will this article be appropriate? Thanks for your help.
September 29, 2016
  Followup from the Pelican Staff: I believe the application data was updated after I answered those questions. it should cover your vehicle. - Nick at Pelican Parts  
roninpearland Comments: Any comments please which are specific to motor mount removal/replace on my w164 2006 ML350 which has a very confined space? Thanks.
April 15, 2016
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Bajwa Comments: i have 2011 mercedes E350 bluetec. and i got the cede P157700.checked with dealer and they say its the electric motermount, i never seen electric motormounts in any car. can any one please help
February 8, 2016
  Followup from the Pelican Staff: That fault code is too long. Can you recheck it and resend the fault code? Then i can check if I have the info for it. - Nick at Pelican Parts  
Dan Comments: Hi, would this procedure replacing engine mount on my 1999 W210 td be the same would like to know before ordering the parts.
Thanks
November 16, 2015
  Followup from the Pelican Staff: I am not sure of the differences on the diesel engines. We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Pogi Comments: I was working on a 99 E320. It is best to tackle the driver side from the top. You just need to move the Rubber PS Jose out of the way. On the passenger side, remove the airbox assembly and put auxiliary water put out of the way to get to the top bolt.
August 3, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
seabrace Comments: I'm going to tackle the motor mounts on my 2001 E430 this weekend. After reading your article, I have one question. Do you access the top motor mount bolt 17mm from under the car or from the top of the car through the engine bay?
May 14, 2015
  Followup from the Pelican Staff: Pretty sure you can do it either way. I prefer to use a long extension and remove it from the top. Keeps my arms cleaner. :) - Nick at Pelican Parts  
Njolopez Comments: Can this instructions works for a mb c230k 2004 sport sedan?
April 5, 2015
  Followup from the Pelican Staff: Applicable Models:
W210 E320 (1996-97) - Nick at Pelican Parts
 
Scot Comments: How about on a 2000 E430?
September 5, 2014
  Followup from the Pelican Staff: The article applies to:

W210 E320 (1996-97) - Nick at Pelican Parts
 
Jay Comments: Have a 2004 , E320 sedan basic .Does the info you kindly provided for replacing the Engine mounts would also include my car?
Thx. In advance for your reply.
August 25, 2014
  Followup from the Pelican Staff: We don't currently have that tech article.
I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Crackerjack mechanic Comments: Can you damage a seal from jacking the engine too high?
August 25, 2014
  Followup from the Pelican Staff: Sure. If the axle pulls too hard on an axle seal. - Nick at Pelican Parts  
ramsan Comments: Nick I know you answered a couple of the "does this process fit my car" questions. I have a w210 e320, but it is a 2002. do these instructions not work for that one either?
Thanks for your help.
July 3, 2014
  Followup from the Pelican Staff: No, it does not. Only up to 1997. - Nick at Pelican Parts  
HarryS3 Comments: I have a 2005 E320 CDI. Will the procedure be different than the steps you outlined?
June 25, 2014
  Followup from the Pelican Staff: This tech article applies to: W210 E320 (1996-97) Your vehicle is not covered. It will be different.

- Nick at Pelican Parts
 
EricSilver Comments: I have a 2001 E430 4matic. The pictures look the same as my car. Will the process be the same?
May 20, 2014
  Followup from the Pelican Staff: The article applies to: W210 E320 (1996-97).

Your vehicle will be different, mostly the obstruction from the 4matic components. - Nick at Pelican Parts
 
Theizaza Comments: I am looking for Parts

Mercedez Benz C280 202 1999 VIN 2020296F860586

Rings Set
Main Bearings
Big End Bearings
Gasket Set

February 18, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
dan Comments: I have a 1996 E300 diesel. Is the engine mount replacement any different for that model?
January 18, 2014
  Followup from the Pelican Staff: It will be different a this article applies to W210 E320 (1996-97). - Nick at Pelican Parts  
oldirty88 Comments: I have a 1999 W202 C280 that I will be changing motor & transmission mounts on this weekend. On this model there is a heat sheild located behind the passenger side mount and looks like removal of the alternator is required. A few ?'s... How do I get the top bolt out of the passenger side mount, I'm not quite sure what's meant by "do one side at a time", and are there any comprehensive write ups for swapping mounts on the W202 m104 & m112 models?
September 24, 2013
  Followup from the Pelican Staff: You do not have to remove the heat shield directly on top of the passenger side mount but you do have to removed the heat shield protecting the idler arm. On the Mercedes Benz website it doesn't mention having to remove the alternator. Looks like one 10mm bolt and one 10mm nut hold it on. Unless you have the tools to support the entire engine you do one mount at a time. If you remove both mounts you will have to position the whole engine into place to properly mount it and that can be alot of work. Check the Pelican Tech Info Center to see if we have the procedure for your car. - Kerry at Pelican Parts  

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