My attempt at replacing the transmission plug. - Page 3 - Mercedes-Benz Forum
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#21 (permalink) Old 08-24-2011, 03:57 PM
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Is it necessary to replace the O-ring on the male connector? The adapter has two O-rings. That's no problem because they come with the adapter.

I checked with the dealer and can't get the O-ring for the male connector.

Will it cause leak if this old O-ring is re-used?
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#22 (permalink) Old 08-24-2011, 04:32 PM
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I would doubt it the orings on the female socket that fits into the gearbox seals the socket into the electrics plate in the transmission and the outer oring on the female socket seals the socket to the gearbox casing. In theory there should be no oil in the socket unless one of the o rings on the socket fail. I would think the oring on the plug is just to keep dust water and crap out of the socket. Ive marked it in red - from when I replaced my electrics plate
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#23 (permalink) Old 08-25-2011, 06:24 AM
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What prompted you to remove the connector locking device if it wasn't leaking.

You have the current two ring version and the only way to acquire new o rings is to purchase the plastic part that includes the two o rings!!
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#24 (permalink) Old 09-18-2011, 01:53 PM
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The adapter has nothing to do with leaking the tranny fluid to TCM. The funcion of those two O-rings is to prevent tranny fulid to leak out to exterior from the outside of the casing of the adapter.

The tranny fluid leaking to TCM is through the connecting pins coming out of the conductor plate and to the connector, then to the TCM.

By replacing the adapter, tranny fluid will not stop leaking to TCM.

TCM is protected by conformal coating. Tranny fluid is not conductive. I would not spray any unknown chemical to TCM to clean the tranny fluid, the conformal caoting maybe damaged by that chemical. I'd simply use paper towel to dry the TCM, or simply put it upside down to let it flow out.

I don't see how tranny fluid can leak out from the outside casing of the adapter then inside of the adapter then to TCM. The only possible path for the tranny fluid to leak to TCM is through the connecting pins from the conductor plate.

Last edited by cerritos; 09-18-2011 at 01:57 PM.
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#25 (permalink) Old 09-18-2011, 02:09 PM
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Quote:
Originally Posted by cerritos View Post
The adapter has nothing to do with leaking the tranny fluid to TCM. The funcion of those two O-rings is to prevent tranny fluid to leak out to exterior from the outside of the casing of the adapter.

The tranny fluid leaking to TCM is through the connecting pins coming out of the conductor plate and to the connector, then to the TCM.

By replacing the adapter, tranny fluid will not stop leaking to TCM.

TCM is protected by conformal coating. Tranny fluid is not conductive. I would not spray any unknown chemical to TCM to clean the tranny fluid, the conformal caoting maybe damaged by that chemical. I'd simply use paper towel to dry the TCM, or simply put it upside down to let it flow out.

I don't see how tranny fluid can leak out from the outside casing of the adapter then inside of the adapter then to TCM. The only possible path for the tranny fluid to leak to TCM is through the connecting pins from the conductor plate.
Looking at the connector itself, I have to agree with you. What then is stopping the fluid from wicking up to the TCM since the pin-holes are not fluid-tight around the pins? Because there definitely is instances of the fluid wicking up, while for other cars is doesn't happen.Is there an O-ring on the conductor plate in the transmission that seals against the connector?



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#26 (permalink) Old 09-18-2011, 04:42 PM
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Agree with gurunutkins that the single O-Ring on the male plug and TCU harness is just to keep out dirt and water.

Wish I had a photo, but recall that the conductor plate shown in guru's post is a solid cup at the bottom - with the electrical TCU leads going through a molded connection on the bottom of the cup.

The adapter plug has two O-rings. O-ring #1 is for sealing the top of the cup of the conductor plate to keep transmission fluid from filling this connection. Fluid in the cup gets wicked up the harness cabling via capilary action. O-ring #2 is for sealing the aluminum transmission case to keep fluid from leaking out. (IMHO)

See corresponding sealing surfaces on Kruso's marked up photo, and the gap between the conductor plate and the transmission housing that is bridged by the adapter plug.

And this link is just one recommendation for not buying a URO part for this application.
http://www.benzworld.org/forums/w163...eware-uro.html
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Last edited by atmsmshr; 09-22-2011 at 03:58 PM. Reason: Adding Beware the URO
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#27 (permalink) Old 09-18-2011, 05:05 PM
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Yep as atmsmshr says the plug is totally sealed from the fluid.

the cone on the conductor plate has the pins sealed in the bottom of it, no fluid can get in from the back of the pins. when you push in the connector tube it has holes in the bottom that the pins slide through but it seals - using the first o ring - to the inside of the cone on the connector plate.
The second ring on the connector tube seals the tube to the transmission casing so the fluid cannot leak out through that joint.
that means that once the screw in the center of the connector tube is tightened no fluid can get into the connector unless the o ring leaks. Its actually possible to get the 2nd o ring leaking and get a leak from the transmission but not into the plug. Similarly if the 2nd o ring doesn't leak but the first does you can get a leak into the plug but not around the transmission. If the male oring is good at that point it will only leak up the wires of from the wire bundle.
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#28 (permalink) Old 09-18-2011, 05:50 PM
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Ah, thanks to both of the previous posters. Now you have solved one of the mysteries of life for me.
I've asked exactly the same question when I replaced my connector, but nobody could answer it at that stage. And I hate mysteries.

PS. Mine leaked at both rings according to you description, since the cup was filled with oil and it was also leaking on the outside.



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Last edited by Kobus; 09-18-2011 at 05:53 PM.
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#29 (permalink) Old 09-18-2011, 09:13 PM
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just remember Kobus the answer to the big question is 42 according to the mice!
cheers
Barri

2001 e320 wagon, 1973 350sl euro, 1974 450sl, 1976 450sl, 1978 450 slc euro
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#30 (permalink) Old 09-19-2011, 03:41 PM
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Barri - ok, I'll bite that apple with a guess.

"What is the meaning of life?" (Hitchhiker's Guide?)
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