PeachParts Mercedes-Benz Forum - View Single Post - 722.120 Transmission Shaft Seals Not Replaceable Without Rebuilding Transmission?

Squiggle Dog · #6 01-12-2015, 04:04 PM

Here's the thing... the O-rings are made to be removed from the outside, BUT not with the shafts in place. With the shafts in place, there is not even enough room for a needle to fit in there. It is impossible to remove or fit the O-rings with the shafts in place. The O-ring on the control pressure rod shaft is not even visible.

It appears there is some sort of metal ring holding in the selector shaft O-ring, but I don't think it is intended to be removed, and the metal ring (or retainer) is probably obsolete.

I see no possible way of replacing the O-rings without taking the transmission entirely apart. The only thing I can think to do is fit some new O-rings on the shafts up against the case, and then JB-Weld some metal washers over them to hold the O-rings in place.

Is the B1 piston cover O-ring realistically able to be replaced with the transmission in the car? I tried removing the one on my original transmission, and I could not compress it enough with my hands. I imagine it is even tougher working with it bolted to the car.

I called it the Bowden rod because it's been a while since I have used the term and couldn't remember what it is called, and remember other members calling it such. But, I remember in the past that I used to call it the control pressure rod.