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  #1  
Old 06-06-2007, 07:36 AM
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Join Date: Aug 2000
Location: Houston, Texas
Posts: 333
Check those metal Transmission Cooler Lines!

I wanted to share an experience with everybody with regard to my '82 240D so you can avoid this. One day last month I noticed a severe oil leak occuring under the front passenger side of the car. Turned out to be transmission fluid coming from the metal portion of the oil cooler line closest to where the flexible line is attatched. There are small metal brackets that hold the metal transmission oil cooler line in place along side the engine from the transmission. There are 3 of them along side the engine. There is another set on the drivers side. Anyway, the bracket closest to the flexible hose had worn a hole into the metal line by way of chaffing. Turns out that there should be rubber bushings inside these brackets. All of mine were deteriorated and there were no more rubber bushings; this caused the chaffing.

I tried getting a new line from MB but they are no longer available. I tried going to salvage yards but with no luck. Finally took it to a place that specializes in a/c work and he was able to braze the line with new material and patch the hole. He was able to save the metal line.

Anyway, just thought I would pass the word along because you really don't notice the problem until its too late and you have a pool of oil underneath your car. Worse, you can be in the middle of nowhere and you lose all your tranmission fluid.

Herb
'82 240D
'87 300SDL
'92 300D 2.5 Turbo

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  #2  
Old 06-06-2007, 09:07 AM
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Join Date: Apr 2005
Location: Austin, TX
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Quote:
Originally Posted by airfoill View Post

I tried getting a new line from MB but they are no longer available.
I purchased a new drivers side hard line from the dealer last summer for my 722.315 Initially, they gave me the wrong part (it was for the 722.416 from the '85 300D), so I can say at least the majority of the 300D hard lines are still available.
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'82 300D Petrol B-G Metallic
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  #3  
Old 06-06-2007, 09:23 AM
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Location: Houston, Texas
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Bob,

Thats good to know. It seems that the 240D owners are out of luck.

Herb
'82 240D
'87 300SDL
'92 300D 2.5 Turbo
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  #4  
Old 02-19-2008, 02:53 AM
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Join Date: Jan 2008
Location: Norman, OKlahoma Boomer Sooner Baby
Posts: 94
Mine did the same thing today! What can i do for my 1984 300D
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  #5  
Old 02-19-2008, 06:40 AM
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Location: Walden, Vermont
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A good transmission shop can make replacement lines. It's not that hard, and relatively inexpensive.
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  #6  
Old 02-19-2008, 08:25 AM
Craig
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Quote:
Originally Posted by 300DFarmer View Post
A good transmission shop can make replacement lines. It's not that hard, and relatively inexpensive.
You can get the correct part from the dealer for less than $100, you don't need to have them fabricated.
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  #7  
Old 02-19-2008, 09:22 AM
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I had the same thing happen. I split an inch long piece of fuel hose, wrapped it around the metal line where the hole was and secured it with about four hose clamps. I haven't had a drop leak since. That's obviously not a permanent solution, but it worked great and I now carry extra hose and clamps in my spares box in the trunk.
ben
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  #8  
Old 02-19-2008, 09:41 AM
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Location: Norman, OKlahoma Boomer Sooner Baby
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thats what i was thinking of doing with the rubber hose. 100 for a piece of steel tube! Thats nuts, theres two shops a few blocks from me, i'll stop and see.

quick thought should i use rtv on the rubber hose for even more seal
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  #9  
Old 02-19-2008, 10:22 AM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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The rubber on my lines was gone also. I bought some rubber tape form the hardware store in the electrical section. It`s called self vulcanizing tape. just wrap the part, and it sticks to it`s self.

clean off the pipe good so it will stick, and place the clamp back on.
I did this last Aug., so far so good.

If it gives me any trouble I`ll just replace the line with a manual 4 speed

Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #10  
Old 02-19-2008, 10:44 AM
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Location: HELENA,MT
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I had a similar issue with my tranmission line. I just cut out a small section with the hole in it and replaced it with rubber transmission hose. I then wrapped that with a heater hose to protect it from rubbing thru and reattached it to the lower oil pan using a holder designed to hold a garden hose in place.
It is not a problem to replace shorter sections of metal line with rubber hose designed to hold the heat and presure of transmission fluid. I used 2 clamps per side because I had no bulge in thr cut metal line. This was to insure that the rubber line did not come loose.

I had 2 lines go bad on my car and fixed them this way and the fixed was still working 50 k miles later.

JOHN
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  #11  
Old 02-19-2008, 10:45 AM
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Did you have a leak or did you use the tape to replace the rubber
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  #12  
Old 02-19-2008, 10:55 AM
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Location: HELENA,MT
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I had a rub thru on the metal line. so I cut out the rub thru metal line and replaced with rubber transmission hose.
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  #13  
Old 02-19-2008, 03:22 PM
Craig
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Quote:
Originally Posted by madsen View Post
I had a similar issue with my tranmission line. I just cut out a small section with the hole in it and replaced it with rubber transmission hose. I then wrapped that with a heater hose to protect it from rubbing thru and reattached it to the lower oil pan using a holder designed to hold a garden hose in place.
It is not a problem to replace shorter sections of metal line with rubber hose designed to hold the heat and presure of transmission fluid. I used 2 clamps per side because I had no bulge in thr cut metal line. This was to insure that the rubber line did not come loose.

I had 2 lines go bad on my car and fixed them this way and the fixed was still working 50 k miles later.

JOHN
I also did that fix for about a week without a problem until the replacement line showed up at the dealer. It seems to work, but I wouldn't leave it permanently patched together like that.
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  #14  
Old 04-23-2008, 07:44 AM
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Posts: 15
Leaking Transmission ATF Cooler metal lines

I just had this problem and it appeared to be leaking from the Passenger side, but the drivers side was worn through in the front clamp as well. Those must be thick metal lines because it was worn pretty good in one spot but not leaking yet.
What I did as a temporary fix was to remove the engine mount shock like thing and get better access. I really cleaned that whole area well and used a lot of brake clean. I found where the leak was by running the car with everything clean and jacked up. The leak is near the higher point in the line and runs back along the line to the other bracket farther back and then drips all over the frame causing it to appear to be leaking from "everywhere" I shut it off and cleaned everything again and sanded the line to rough it up a bit. There was slight seepage with the engine off so I mixed up some JB Weld 5 minute quick epoxy and let it set for a minute. I cleaned the area with brake clean and dried it and dabbed it onto the leaking areas and let it set up. This was just a small amount. Then I mixed up a larger batch, scratched the epoxy a little with some coarse sandpaper and covered the entire metal line all the way around and an inch in both directions.
this repair lasts a few months. I know this because this is the second time repairing my repair. The first time I didn't have the money to get the new lines from Mercedes and then I forgot about it since it no longer leaked.
The symptoms were flares between shifts like it missed the gear for a sec and slipping of the trans when starting off and then I noticed the leaking.
This time I plan to go to the dealer and get both lines.
MikeZ
85 300SD @ 375K
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  #15  
Old 04-23-2008, 11:39 AM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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Quote:
Originally Posted by unclemark View Post
Did you have a leak or did you use the tape to replace the rubber
I didn`t notice this question at the time you asked it.

I added the rubber tape to the line because the original rubber was gone
on most of the clamps. it was an easy fix, but had to open up the clamps
some to fit over the rubber. by doing this it misaligns the holes some the
bolt fits through. but with a little perssuasion and determination, I over
came the little bugger.


I don`t know if cutting out the bad spot and using flair nut compression
fittings would work or not, probably not a lot of pressure in the lines,
don`t know for sure. but the lines are probably metric and finding the
fittings might be a problem.
Brazing the lines by someone that knows what they are doing might work.


A side note: The high pressure oil supply lne going to the Turbo has a
couple clamps hold it. I have a line that has a hole it it from the rubber
missing in the clamp.
If this one leaks, a quick way to change your oil.

My 2¢ worth

Charlie ☺

.

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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