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Registered
85 300SL Euro,97 SL320,95 S420,07 S550
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1,600 Posts
Discussion Starter #1
I have a 1997 SL320 .,my transmission Control unit is full with transmission oil,is there a transmission plug to fix it or do I need a new unit.
If I need a new Unit does somebody know the price ,I can't find it nowhere.

Thank you
 

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Registered
85 300SL Euro,97 SL320,95 S420,07 S550
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1,600 Posts
Discussion Starter #2
I just try again if anybody maybe has a solution

Thanks
 

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Outstanding Contributor
1997 SL600 Brilliant Silver Sport with grey/dark metal interior, 234K miles
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1,977 Posts
The seal for the big round electrical connector at the front corner of your tranny needs replacing. Not too expensive.
 

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Registered
1998 SL500, Panoramic Roof, Factory Xenons, Black/Black/Black 2012 GLK350 Black/Beige
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126 Posts
I changed the leaking plug on my '98 500 last week. Part cost $12.00 at the local MB dealer. Takes about :30 to :45. Only tools needed are ramps to get the front of your car up, and a 7mm socket, 4" extension and a ratchet.

Search "transmission plug leak" and you'll find some very complete threads on how to do the job with lots of photos.
 

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Registered
85 300SL Euro,97 SL320,95 S420,07 S550
Joined
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1,600 Posts
Discussion Starter #5
Thank you,how did you clean out control unit?
 

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Registered
1998 SL500, Panoramic Roof, Factory Xenons, Black/Black/Black 2012 GLK350 Black/Beige
Joined
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126 Posts
Fluid had not migrated into the control unit on mine. If I recall correctly, the threads I found say to use electrical contact cleaner. There is even the MB factory technical service bulletin in those threads that describes how to clean it.
 

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Moderator
SL55, 300SE, GL450, Daytona 955i
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10,293 Posts
The tranny plug needs replaced anyway, so start with that...

next, clean up the contol box, and hope for the best...
 

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Outstanding Contributor
1997 SL600 Brilliant Silver Sport with grey/dark metal interior, 234K miles
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1,977 Posts
I think I remember reading that if you keep driving with the bad connector seal and the flooded control box, a new contact plate is in your future (bigger expensive trouble).

Attend to the issue pronto.
 
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