Those of you with 722.6 transmissions....are you finding that it's always a good idea, when you replace the gasket and filter, to replace the 13-pin electrical connector that has historically been prone to leaking ? Or has its redesign over the years made it not so susceptible to leaks such that you can leave it alone until it actually starts leaking?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

the latest design has two black O rings on it, they are quite thick too, This design does not leak and MB says to paint a green mark on it to identify from the outside as the O rings will not seal when reinstalled - unless you can somehow find the replacement O rings.

I bought mine from a Dodge dealer - this transmission is also found in chargers/challengers/jeeps etc.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

That's interesting. My indie replaced mine when I bought the car in the fall as it was leaking. So presumably he used the latest design and I shouldn't have to worry about it when I change the fluid/filter in 50k miles.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

190k miles and no replacement yet

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

I'd say change it once with the black o ring unit. The one on my 97 C280 ( 161 K ) was just changed due to leakage at the wiring connector.

There are two o rings on the case connecto, the outer one keeps fluid from dripping on the ground, the inner one keeps oil from leaking into the wire connector.

The wire connector also has an o ring to keep water out.

It is against my religion to fix anything that is not broken. A sure way to get a leaking connector is to keep changing the non-leaking ones. Eventually you will put in one that will leak.

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'97 E 300 D

If yours is unknown then replace it, the original ones had white nylon type O rings, the mid life update ones had red O rings (they also flatten over time)

the last one are the correct ones and please do not buy URO or anything else than a genuine MB product (chrysler also sell the genuine MB product) - they have really thick O rings - and require a good slathering of lubricant to install it otherwise it will leak as the O rings will not be seated. the torque for the little screw is a very gentle touch past contact - 2.5 nm

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

I have about roughly about 200 13 pin connectors saved from over the years in excess. So I put them in with new o-rings every time. You don't probably have as many adapter plugs as me, so it really isn't necessary to replace it every time to try and get rid of some.

Some guys on the other forums say do it every time, it really IS not that necessary at all. Don't do it unless it's leaking! It's a waste.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

I change parts when they are near the end of their expected service lives. I'd rather have a car down on my schedule and not at random.

If I saw it weeping from the seal then yes, otherwise leave alone. That said, if the seal is a known issue and inside the sump then yes, go for it during an ATF change.

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)

Sounds like it WAS a known issue but now not because of the design change.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

where did you buy the O rings, I am also of the school that why waste a part for only 2 piddly O rings, but I could not find them anywhere.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)