Mercedes-benz 190e front and rear flex disc replacement w201 1987-1993 pelican parts diy maintenance article electricity demand

##

If your automatic transmission is starting to change gears a little harder, or you are getting a vibration through the transmission or center tunnel while driving, your flex disc may be deteriorating. This chassis has two flex discs that connect the transmission to the driveshaft and the driveshaft to the differential. These units will wear out over time and even if you are not noticing any signs of trouble, they should be inspected every year. The discs are made out of rubber and are designed to absorb some of the shock from the drive train. Like anything rubber, they dry out, crack and will eventually fail. If you let the discs get to that point while the car is in motion, they can cause a tremendous amount of damage.

Begin by safely raising and supporting your car off the ground. Please see our article on jacking up and supporting your Mercedes-Benz. The care will need to be in neutral while working on it, as you need to spin the drive shaft to give you access to the bolts on the flex discs.

I decided to do the rear first and then the front. It does not matter which order you do them in, but the front is a little more work. You will need to get access to the mounting bracket in the middle of the drive shaft by removing the protective cover between the drive shaft and muffler. It is held in place by three 8mm screws. Remove the screws, slide it around the muffler and set it aside.

Over the years Mercedes and the different companies that have made flex discs have used an assortment of nuts and bolts. While you may find different hardware from front to back they all have one thing in common which is they are single use, you should never reuse the hardware from the old discs. The Pelican Parts kits come with all new hardware so you do not have to worry about ordering it separately. This would also be a good time to replace your driveshaft support (carrier) bearing. Please see our article here

Remove the hardware connecting the rear flex disc to the differential. With all the hardware removed, undo the 13mm bolts that hold the bracket in the middle of the drive shaft. This will allow you to lower the driveshaft and give you enough room to separate and remove the flex disc from the shaft. If the disc has been on a while it may be stuck on there pretty tight. Just be careful when separating them as the driveshaft and flange are balanced and you don’t want to ding or dent them up.

With the old disc removed,install your new disc with the side that has the writing on it facing the driveshaft. Install the hardware loosely. With everything lined up, reinstall the bracket on the drive shaft and then torque down the flex disc to Mercedes-Benz specifications.

To replace the front disc you will need to support the transmission, as you’re going to be removing the transmission mount. There is not enough room to access the front disc with the mount in place. Make sure you carefully support the transmission by distributing the weight over a large surface. Use a good size piece of wood and a couple of floor jack stands to help. Do not just stick a single floor jack under the transmission, as you are going to be putting a fair amount of force into torquing the bolts down and you want everything properly supported. With everything supported, remove the two 13mm bolts holding the mount to the transmission and then the four 19mm bolts holding the mount to the frame.

Undo the six nuts and bolts connecting the flex disc driveshaft and transmission. You can now slide the driveshaft back on its spindle to give you enough room to remove the old unit and install the new disc. A personal note here, I had to release the bracket on the center of the drive shaft to give me some additional room to get the old one off and new one on.

Following the same procedures as the rear, lubricate the fittings, install the single use nuts and bolts loosely and then reinstall the bracket in the center of the driveshaft. Torque the bolts, reinstall the transmission mount and the protective cover on the driveshaft.

Comments: Thanks a lot for posting this. Quick question, do you know what that wire is for in figure 6? If you look at figure 6, it has a protective cover, it goes from left side of the sump plate through transmission mount plate and goes into the transmission on the right side on the right side of the red arrow on figure 6. You can also see it in figure 7, its on top left side of the lumber.

Comments: Hi I have a 1996 c280 , when downshifting when on incline or decline sometimes level there’s a chunk noise from 2 to 1 transmission is fine , after inspection the flex discuss look ok but the center bearing mount has a lot of play no cracks , it can be moved with 2 fingers and there’s a thuk noise when I do this any ideas?

Comments: I found this article very informative but was surprised there were no links to order the parts…. I was really hoping to find DIY info and source for flex discs and drive shaft support bearing. You info and pics were great, sure wish I could have found the parts though. Paul

Comments: Replaced a front flex disc with these great instructions and even better pictures. Had to undo the centre bearing bracket and remove cross piece on front section of propshaft ‘tunnel’ then gently prise the old disk hammer and old screwdriver from the gearbox and propshaft mounts. A real uncomfortable job without a lift but done now for another 100,000 miles maybe. Remember to mark the transmission bracket and propshaft clearly it’s dark under there.

Any ideas??? BTW- this car has had an engine swap before I bought it… it has a 617.951 from a ~1985 300SD. I have assumed this would not have caused a drive shaft length change- since they were both W126 chassis. Anyway… the !@##$@#$ drive shaft fit before I put the new parts on!