Part number 126 277 09 03 is totally loose; It can be rotated 360 degrees with little effort. It can be pushed in and out 1/4 -1/2 inch. Upon pushing it in, there is a distinct *squishing* noise, as if its moving air and oil kind of like a hand pump. The reason I was under the car is because I have observed huge puddles of transmission oil under the car.

Also, if you sink it all the way in, it will stay down. If I then start the car for a min and then turn it off, when I go back under the car and look, the part is back to its “normal” position. Its as if it has been pressurized or something and pushed out.

Look in the PICT (large,1600x1200). The red arrow is the part in question. The yellow arrow is part number 126 277 25 03. That part is tight, secure, and dry. The Green arrow points toward the front of the car.

What is going on and what do I do?

The Red arrow is the infamous B2 piston, what you observed is perfectly normal. It is a double actuating piston, it’s applied and released by oil when the engine is on. The green arrow is the B1 piston.

so then you're saying that nothing is wrong?


EDIT: I assume there should be no oil seeping out if it. correct? If I do have a leak there, how do I go about fixing it? Is this a common problem with these cars?

There is an o-ring around the piece you are pushing in.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

maybe the o ring is broken!

__________________
2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)

and is said o-ring easy to change? do I have to do something crazy like drop the tranny pan?

There is an o- ring seal in the case it’s easy to replace. With the engine off push the cover in and remove the retaining ring, then pull the cover out. The o-ring is red in color, remove it from the case and install the new one. If you have trouble installing the new o-ring just put it in your refrigerator for a short time to shrink it.