Throbbing/Rythmic Vibrations at 40-65 MPH - PeachParts Mercedes-Benz Forum

mobetta · #1 03-12-2008, 02:01 PM

YOU DO NOT NEED to drop the exhaust for the carrier bearing.(w123) jack up the rear end, support w/ stands,(if its on ramps, you cant rotate the driveshaft) put car in N and crawl under w/ 15mm & 17mm wrenches. also a 12mm socket and at least 6" extension. remove the 3 bolts which attactch the flex disc to the rear diff. remove 2 bolts that are on bearing support. pry the flex disc off rear end, remove to the rear of the car.

to do the bearing, a big puller is required. I used a pvc tube to drive mine on, but it was weak. a 1 1/4"X10" pipe nipple will work.
I would order a new bearing, mount, and the 2 metal shields which are on either side.

legasea · #2 03-12-2008, 02:09 PM

Quote:

Originally Posted by mobetta

YOU DO NOT NEED to drop the exhaust for the carrier bearing.(w123) jack up the rear end, support w/ stands,(if its on ramps, you cant rotate the driveshaft) put car in N and crawl under w/ 15mm & 17mm wrenches. also a 12mm socket and at least 6" extension. remove the 3 bolts which attactch the flex disc to the rear diff. remove 2 bolts that are on bearing support. pry the flex disc off rear end, remove to the rear of the car.

to do the bearing, a big puller is required. I used a pvc tube to drive mine on, but it was weak. a 1 1/4"X10" pipe nipple will work.
I would order a new bearing, mount, and the 2 metal shields which are on either side.

GREAT INSTRUCTIONS. Good thing, because I was just searching online and could not find ujoints for sale on any sites. the center bearing and rubber mounts are plentiful ($50 for the pair). I have not seen the metal shields though. I will pick up some jack stands this weekend and order the parts, I am just hoping I am not replacing a part this has already been replaced recently. Hard to tell, very dirty under there. $50 is not a bad loss though if problem persists.
Thanks again for all the advice. I was also thinking about replacing flex discs as well even though they do not appear to be cracking.

Alberta Luthier · #3 03-12-2008, 02:13 PM

Quote:

Originally Posted by mobetta

YOU DO NOT NEED to drop the exhaust for the carrier bearing.(w123) jack up the rear end, support w/ stands,(if its on ramps, you cant rotate the driveshaft) put car in N and crawl under w/ 15mm & 17mm wrenches. also a 12mm socket and at least 6" extension. remove the 3 bolts which attactch the flex disc to the rear diff. remove 2 bolts that are on bearing support. pry the flex disc off rear end, remove to the rear of the car.

to do the bearing, a big puller is required. I used a pvc tube to drive mine on, but it was weak. a 1 1/4"X10" pipe nipple will work.
I would order a new bearing, mount, and the 2 metal shields which are on either side.

You will also want a large set of channel lock pliers to loosen that big nut so you can shorten the drive shaft when prying it off the rear end.
I'd suggest a good look see with a trouble light, before you buy parts in case your flex disks look iffy(little cracks in the rubber around the bolt heads). If they look bad you would want to change them while you are 1/2 way there.