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#1
08-31-2008, 11:47 PM
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"typical" leaks on a W126 transmission?
If a W126 diesel has a leaking transmission (slightly), what is the most likely culprit? Seals or simply a gasket? I have owned two Mercedes (1984 190D and a 1985 380SE) and neither had transmission leaks.
I am looking at a 1987 300SDL (301K miles). Transmission shifts good (says the seller), but it has a slight leak he says. The car is out of state, but local to some relatives that live there and I was going to get my uncle to check it out for me, but if its going to be a major problem, I am going to pass. The guy that owns this car said that he has owned 4 different Mercedes diesels and all had transmission leaks. Thanks. 
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#2
09-01-2008, 01:51 AM
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You need to allow more than two hours waiting for a reply, especially this late at night.
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#3
09-01-2008, 02:06 AM
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Quote:
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#4
09-01-2008, 03:46 AM
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In my experience, it would be where the dipstick mounts to the transmission. it i s bolted to the transmission with a single hex bolt and uses a rubber gasket that can go bad. I would definitely check there first. then i would suspect the pan gasket.
__________________
 1979 240D with a 617 turbo diesel.
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#5
09-01-2008, 05:21 AM
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Of the four I've owned, three 123's, one 126, only the SD leaked any transmission fluid. I did a filter and fluid replacement, with a new gasket, no more leak. So, as far as I'm concerned, no such thing as a normal leak. Make sure whomever does the work, properly torques down the pan, in the correct order.
__________________
83 SD 84 CD
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#6
09-01-2008, 12:32 PM
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The leak from everywhere.
300k is a ton of miles, if its the original trans its shot.
__________________
2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#7
09-01-2008, 12:48 PM
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Quote:
 Mine was leaking when I got it at 207k....I had it resealed at 212k.....(shop replaced all seals, they said trans was great inside still, nearly new!) Now I'm over 274k with no leaks ever since, I change my fluid/filter/pan gasket once a year. 
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#8
09-01-2008, 12:49 PM
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Every freaken seal on mine has leaked, and I have gotten 95% of them taken care of...just in time for a rebuild!
This trans has pissed me off so much with leaks I want to exchange it for another, and not rebuild this one...
__________________
2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#9
09-01-2008, 03:45 PM
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1) pan gasket
2) front pump seal 3) tail shaft seal 4) side cover seals 5) dipstick tube seal 6) bowden cable seal and so on and so on...
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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