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300SDL coolant expansion tank retrofit, tank from 300SD 300SDL coolant expansion tank retrofit, tank from 300SD
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  #16  
Old 07-13-2019, 03:34 AM
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Quote:
Originally Posted by Bigdaddybenz View Post
My coolant expansion tank suddenly cracked and I could not find the OEM that was readily available, I was able to locate one that fits all other W126 chassis and because my wife uses the car daily and relies upon it, I decided to attempt a retrofit using a tank that is for a 300SD. As you may well know, the 300sdl model was produced only fro 2 years, 1986 - 1987 and vehicle specific parts are not only hard to come by but also very expensive...... Here are pictures of my retrofit, the cooling system is operating like a charm!
What is the part number you used? Thanks

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

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1 X 2006 CDI
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1 x 83 300D
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  #17  
Old 07-13-2019, 09:16 AM
Diseasel300's Avatar
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Quote:
Originally Posted by JHZR2 View Post
I have a 350SD; your pic looks like its bottle iirc; or, is it moved further back?

The 350SD/SDL uses the same coolant bottle as the 300SDL. I installed the new one I had on the 300SDL in the 350SD to replace the crusty yellow one it came with. Perfect fit.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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  #18  
Old 07-13-2019, 10:01 AM
JHZR2's Avatar
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Quote:
Originally Posted by Diseasel300 View Post
The 350SD/SDL uses the same coolant bottle as the 300SDL. I installed the new one I had on the 300SDL in the 350SD to replace the crusty yellow one it came with. Perfect fit.
That’s what I thought. And doesn’t look unlike what I know to be the 617 bottle. Thus why I was somewhat confused by the OP.

.
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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #19  
Old 07-13-2019, 10:12 AM
Diseasel300's Avatar
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Quote:
Originally Posted by JHZR2 View Post
That’s what I thought. And doesn’t look unlike what I know to be the 617 bottle. Thus why I was somewhat confused by the OP.

.
Go back and look at your 350SD. The coolant bottle is unique only to the 86-87 300SDL and 90-91 350SD/SDL. It's designed to wrap around the side of the air filter box and sink down beside it.

I personally think a better solution than hacking up the firewall and deleting the washer bottle would be just to replumb the air filter and use a more generic coolant bottle.
__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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  #20  
Old 09-28-2020, 04:48 PM
cmac2012's Avatar
Renaissances Dude
  
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 34,061
I didn't realize that 'coolant bottle' was slang for expansion tank. And yes, I knew something was weird in the OP pic - of course, the washer reservoir was deleted. I likes me some of that. Maybe another unit could be put in front of the retrofit coolant bottle, a smaller one perhaps. Not a pleasant idea, but my take at present is that a new SDL coolant bottle is harder to get than a replacement radiator. Mine is old as hell, surprised it hasn't leaked yet.
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1986 300SDL, 362K
1984 300D, 138K
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  #21  
Old 09-28-2020, 08:28 PM
JHZR2's Avatar
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Join Date: Jan 2002
Location: New Jersey
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No, an expansion tank is different. The expansion tank is an unpressurized bottle. There’s liquid in there to keep a liquid seal and prevent air from getting in.

A coolant bottle like ours is part of the system. In some it’s somewhat part of the flow path. I suppose the best clue is when it’s pressurized, and you fill the whole system through it.
__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #22  
Old 09-28-2020, 10:24 PM
cmac2012's Avatar
Renaissances Dude
  
Join Date: Dec 2004
Location: Redwood City, CA
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Ah, need to look into that.

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1986 300SDL, 362K
1984 300D, 138K
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