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#1
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Ever had or heard of a warped trans oil pan?
I have a pretty serious trans leak at the passenger rear corner of the trans oil pan. It is dripping from the bolt. I replaced the gasket but the leak is still there! Is it possible the pan is warped, maybe the tab with the bolt hole is bent? Visually it looks fine. Trans works great. I cannot trace the leak from anywhere else. I cleaned the area and it appears that it is in fact leaking at the gasket. Are there any connections/seals above the rear passenger side of the trans that I would not be able to see without dropping it?
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6 |
#2
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I can't say from years of experience, but from the one time I dropped my pan and reinstalled it I had a leak from the right rear corner. I believe overtightening is the culprit. I removed it again, set it on a bench and tapped it down slightly with a hammer and put it back on, this time just going a bit past snug, and it no longer leaks.
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#3
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Quote:
Thanks for the response.
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6 |
#4
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yes. When I overtightened it it bent it in towards the trans, I tapped it back where I thought it was to start with. When I looked it over, I saw I had bent them all a bit.
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#5
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Take the pan off and put it on a flat surface - like a glass coffee table. You should be able to see if it's warped or not.
If it is, You should use a short piece of 2x4 and a hammer to tap all sides back into "flatness". Just hammering at one hole could cause the metal to bow out in the other direction. Obviously, don't hammer on the glass coffee table. If the pan isn't the issue, hold up the pan to the trans and see where the gap is. I don't think there's much you can do about it if the trans mating surface is slightly warped other than using thicker or multiple gaskets and using some "right stuff" or similar MB sealing product. Make sure you follow the correct tightening sequence, as well - pretend it's just a big wheel and get as close to a star pattern as possible. Also, tighten in 2-3 stages; this will insure equal torque around the entire pan. Good luck!
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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608 Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL. |
#6
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Yes, happened on mine last year, when the original pan was 20 years old. I don't have any explanation for why it happened, no obvious trauma to the part, so I imagine it was age and the fact that the pan has been removed and re-installed a number of times over those 20 years, that it might have been incorrectly torqued at some point. A new OE pan fixed the leaking.
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1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't |
#7
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I've had it happen on two of our cars.....one I had to buy a new pan for, the other I had to do a swap with a part I had in inventory.
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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) |
#8
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On my 300SE, I could have sworn that the culprit was the pan, but it actually turned out to be the banjo fitting on the cooler line. The fluid was just dripping down in a way that made it seem like it was coming from the pan. Worth a check before you pull your pan. In my case, a 3/4 turn with a wrench solved the issue.
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition |
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