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Old 12-09-2002, 09:12 PM
dmorrison's Avatar
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Join Date: Dec 2002
Location: Colleyville, Texas
Posts: 2,694
E300 transmission wire plug adapter leak

MBSTARs said

Add one more parts to you list 140 270 02 50 is wire plug adapter on right side of the transmission (because adapter always leaks fluid)

I have had the adapter seal replaced 3 times in 56,000 in my 1999 E300. So whats the deal with this. I am getting a little tired of seeing this car in the shop.
I have changed dealers and hopefully will see a change, but is this is on the forum I'm sure its out there bieng a pain to everyone.
Could one of the techs on the forum address this. What is Mercedes doing about the frequency of this problem.

Or is it just me!!!!

1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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Old 12-10-2002, 12:53 AM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
We have replaced plug connector on every 722.6 transmission comimg in for service so far we have not seen anyone come back with leaking plug connector again....maybe something to do with temperature???
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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Old 12-10-2002, 05:58 AM
Senior Member
Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,398
MB recommends modifying the conductor plate to eliminate this particular leak. The valve body must be removed and partially dis-assembled. A small bit of plastic is removed at the area of one of the solenoids on the conductor plate. Your dealer has probably already done this though. I've also found that when re-installing the valve body, it helps to make sure it's as far rearward as it will go. This allows the coupler with the O-rings to fit a bit tighter against the sealing surface. The valve body wiil only move back and forth about 2mm, but before the modified seals were available, and before MB came out with the conductor plate modification, this fixed all but the most stubborn leaks. Good luck
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Old 12-10-2002, 07:54 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
You shouldn't replace the seals. The plastic warps & causes the leak. Replace the plastic adaptor when there is a leak. The conductor mod was ONLY for 1996 & some 1997 cars. IF you have a leak there after replacing the adaptor then the conductor plate is warped & needs replaced as well.
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