One of the most common parts to deteriorate on the W210 chassis is the transmission mount. The rubber within the mounts becomes old and brittle, and doesnt perform a good job of isolating the transmission from the rest of the chassis. This eventually can cause a whole host of problems and cause wear to other critical components. Begin the replacement by jacking up the front of the car and placing it on jackstands.
If you look at the transmission mount bracket, you'll see a bracket that branches off of it and holds the exhaust in place. You'll need to disconnect this bracket first. Loosen and remove the two 13mm bolts on the outside and then push the bracket out to free up the exhaust. Unbolting this bracket allows you to lift the transmission just a little higher and prevents damage to the exhaust when you jack the transmission up.
Now place a floor jack underneath the bell housing of the transmission to support the weight when you unbolt the mount bracket. Do not jack the transmission up from the transmission pan. You will dent it and possibly damage the valve body inside. Once you have the jack in place, jack up the transmission until you have taken the weight off of the mount. Many times, a collapsed mount will allow you to jack the transmission up two or three inches. This decreased height will affect the angle of the joints on the driveshaft, causing wear. You also wont be able to remove the front oxygen sensor from the exhaust.
Once the transmission is secured, remove the two 13mm bolts in the center of the mounting bracket. These two bolts hold the mount in place. Don't be alarmed if the transmission shifts upward a little. Just make sure that it is still secured on the jack. Now remove the four 16mm bolts holding the mounting bracket to the underside of the car. You may need to use a breaker bar to get these loose. Now lower the plate out of the way.
The mount itself is secured to the end of the transmission with two long 16mm bolts. Remove these and the mount will fall off. Now take the new mount, and orient it so that the bottom edge is horizontal when bolted on. Torque the bolts to the transmission to 30ft-lbs. Now refit the bracket to the underside of the car, but just snug the bolts up so that you can move the plate. Lower the floor jack so that the new mount rests on the plate. Slide the bracket around so that the holes for the mount line up and re-install the two 13mm bolts. Torque the 13mm bolts to 25ft-lbs. Now torque the four 16mm bolts on the plate to 40ft-lbs. Re-install the bracket to the exhaust and you're all done.
Shown here is a new transmission mount for the Mercedes-Benz E320 (W210). If any of your mounts have failed, Pelican Parts can supply you with a new one.
You'll want to use a floor jack to lift and support the transmission. Do not place the jack on the transmission pan. It will bend and possibly damage the transmission if you do so. The bell housing is strong enough as shown here. Jack up the transmission until you take the weight off the mount. In our case, we were able to jack up the transmission about two inches.
Now fit the new mount to the end of the transmission, taking note of the orientation. The "ears" of the new mount are angled. You'll want to position the new mount so that the bottom edge of the mount is horizontal when bolted on. Torque the bolts to the transmission to 30ft-lbs. Now refit the bracket to the underside of the car, but just snug the bolts up so that you can move the plate. Lower the floor jack so that the new mount rests on the plate. Slide the bracket around so that the holes for the mount line up and re-install the two 13mm bolts. Torque the 13mm bolts to 25ft-lbs. Now torque the four 16mm bolts on the plate to 40ft-lbs.
Whats a fair price for engine and transmission mounts and labour
December 3, 2013
Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 for a price on the parts. Labor rates vary significantly so you will have to check with your local garage or whoever will do the work for you. Always expect additional charges if it's an old car and things are breaking or rusting. - Nick at Pelican Parts
Comments: thank you all for all this imformation. I have learned a lot from this. I'll make sure to check here even before I consult a mechanic. Thk U all
September 7, 2013
Followup from the Pelican Staff: Thanks for the feedback. Glad we could help. - Nick at Pelican Parts
Comments: Hi. I have a Mercedes 1997 C280, and I was wondering if I could use this article to replace the transmission mount. I think my car is the W202, and not the W210, but in many things they look very similar. If not, where can I get the information?
July 19, 2013
Followup from the Pelican Staff: Hello Araucano
The 1997 C280 is a W202.028 chassis.
This diy will work for your model. -whunter-
Comments: I have been told that on my vehicle the bracket which holds the transmission is damaged and needs to be replaced. I can't find a part number for it. It's a 2000 e430 4matic. Thank you.
May 21, 2013
Followup from the Pelican Staff: Your transmission cross member should be MB# 2102421201 http://www.pelicanparts.com/cgi-bin/ksearch/pel_search.cgi?SUPERCAT_FLAG=Y&make=MBZ&please_wait=N&forumid=&threadid=&command=DWsearch&description=2102421201&x=9&y=4
Check out some other sample projects from the book: