Changed the thermostat. Got a new o-ring gasket and all. And it leaks. PO had used silicone, Spent a long time cleaning it up.

What else can I do? It looks like the o-ring that fits around the t-stat is the only seal in there?

thanks
Doug

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83 300SD Dark Silver Dark brown inside

The o-ring is, and should be, the only seal needed. Check for a silicone goober you might have missed or perhaps the o-ring slipped out of its groove and got pinched during assembly.

Good luck,
Jim

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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)

Agreed, make sure you don't have a hose leaking fluid down, to fool you into thinking the leak is elsewhere. Good luck.

Attached Thumbnails

 

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83 SD

84 CD

I honestly don't know what the set up is in your model; however, when I changed out my t-stat and gasket last month I ran into the following problem. Went to the parts place and they said they had the parts for my model - I bought them, got home took everthing apart, dug out the old stat and gasket only to find that not only did I not get the right stat, I also got the wrong gasket. What I was given was an o-ring, but that is not what I needed. What was needed was gasket that fit around the outside rim of the stat. I had to reorder elsewhere and wait four days to get it. Anyway, like I said defer to someone else who knows your model, but on mine, it doesn't take an "o-ring" in the strictest sense, but rather a rubber seal.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman

Tankowner is correct. I know from my own experience that NAPA will routinely sell you an o-ring when you really need a gasket which fits around the entire edge of the t-stat. The solution is easy...buy your replacement t-stat from the dealer. Believe it or not I have found over the years that t-stats are cheaper from M-B than they are from NAPA and you also have the added benefit of actually getting the CORRECT part.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz

got my gasket here on this site. So it should be the correct one. Also looks like the one that came out.
I will try gain this weekend.

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83 300SD Dark Silver Dark brown inside

[IMG]https://www.***************/secure/PartImages/6172001815.jpg[/IMG]

Again, I don't know the model. However, the picture in the link shows a possible two seals - one looks to go around the stat and the other an o-ring. The description states that both are now included to account for both early and late models. Dunno if that helps.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman

I think the gaskets are for the surround, and housing, just in case you're not sure of what you need.
But ya never know.

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83 SD

84 CD

I have both of those, But only used the one that fastens to the t-stat. Do I need the other one? Napa's also comes with a seal, almost like a wheel seal?

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83 300SD Dark Silver Dark brown inside

Should not need that either. I used only the gasket that aroung the t'stat itself, no leaks.

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83 SD

84 CD

Check the thermostat housing and the hose in the middle of that mess.

We can beat that price + you support the forum

MB# 617 200 18 15

Item Number: 6172001815
Main Category: MERCEDES BENZ
Sub Category: Engine Cooling System
Description: THERMOSTAT, All OM617 Turbo Diesel *80 DEG*
Weight: 0.300

FOR PARTS SALES CONTACT:

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ASE Master Mechanic
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
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1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/

Absolutely. Always better to buy here! Just posting the pic to help illustrate the possiblities.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman

Are you sure you installed it the correct way?

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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg

t-stat is in the correct way, I did not see a direction on the gasket.
The housing is dripping onto the lower hose right under the t-stat seal.
Snowing today. See how it goes Monday...

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83 300SD Dark Silver Dark brown inside