Hey,
I’m having a transmission on my 91’ 300SL (M104.981/722.5).
The transmission will leak while “sitting” over a period of time, I’ve been doing some engine work and while looking under the car, it’s leaking a lot.
The leak comes from the passenger side of the transmission, front half of the pan length.
Looking at this side of the transmission, I see the B1 piston, oil cooler line, dipstick tube and the bowden cable.
Combining with the fact that it will leak only while the car is off and has been sitting, which of these components are most likely to let go of fluid?
I assume that after the fluid drains (car off) it will raise above the pan gasket level and oil cooler line level, not sure about the dipstick/bowden cable as they are high..
(I know it’s the 722.3 in the pic, just for reference)

Attached Thumbnails

 

Yep, fluid level rises with engine off as the torque converter drains into the pan. Look at dipstick tube / cable and anything else above running fluid level.

When tracking down an oil leak on the transmission you can make life a lot better for yourself by taking the time to clean it very well first. Then look for new oil.

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

Start as far up as you can reach and just touch components, working you way around each, top to bottom. Soon as your fingers have trans fluid on them, you have found the leak.