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Old 05-25-2019, 04:07 PM
Registered User
Join Date: Dec 2014
Location: So Cal
Posts: 3
300SDL driver trans side case plug leaking fluid =(

Hey guys I'm a long time lurker and this is my first post. I have an issue with my 86 300SDL 722.3 trans. it's leaking from a plug behind the shift lever module (driver side). It's not from the actual shift lever seal. It looks like a Steel plug that's flush with the transmission case (rusty). Fluid is weeping out slowly and making it seem like the rear of the trans is leaking. here's a picture. Any help on how to seal it would be greatly appreciated.

Thank you

Attached Thumbnails
300SDL driver trans side case plug leaking fluid =(-w126-plug-driver-side2.jpg  

Last edited by factory310; 05-25-2019 at 04:14 PM. Reason: messed up =(
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Old 05-25-2019, 05:04 PM
Registered User
Join Date: Mar 2009
Location: San Diego
Posts: 3,047
Been there done that but with tranny in car. Much more difficult than yours with it on the bench.

300SDL tranny fluid leak
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details.

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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Old 05-25-2019, 05:50 PM
Registered User
Join Date: Dec 2014
Location: So Cal
Posts: 3

Aw thanks so much !!! i just grabbed that picture from the internet. My trans is mounted on the car so it looks like im going to collect all the o-rings i need to do while im already in there ill do the Bowden cable oring and whatever other O ring i can change. I dont feel like pulling the valve body out over and over.

Thanks a bunch. Looks like Im going back into the trans for a deep dive...

OH LORD. cant wait for the day i have an electric car without a darn trans.

*sigh* the battles i do to not have to smog a car in So cal !!!

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