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  #31  
Old 08-01-2015, 01:47 PM
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How did you take the 2 pieces on the left apart in your pic? I took my T stat out on my spare housing and those 2 pieces won't separate. It looks like they are held together with a black rubber seal. Those 2 pieces make up the T stat assembly (I think), item 86, and is what you get if you buy a new one from Mercedes, which is what I plan on doing. I'll post pics of mine later.



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  #32  
Old 08-01-2015, 02:07 PM
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I would say yes. I'll do that same test with my good one to confirm.

I think it's a Teflon disc but not certain

I just pressed the two parts apart. It's just a snug fit, nothing special.
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  #33  
Old 08-01-2015, 02:13 PM
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Quote:
Originally Posted by mach4 View Post
I would say yes. I'll do that same test with my good one to confirm.

I think it's a Teflon disc but not certain

I just pressed the two parts apart. It's just a snug fit, nothing special.
Why did you press them apart? Is the part of the T stat the non bronze piece (with the 4 vent orifices, you called it a piston) that does the sealing between oil pump and oil cooler? I think it is but need to study it more to be sure.
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85 300D turbo pristine w 157k when purchased 161K now
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  #34  
Old 08-01-2015, 02:17 PM
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My stat is marked 03X, not sure what that means and not sure what year or what engine the housing came from. I'll get a p/n off the housing later.

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85 300D turbo pristine w 157k when purchased 161K now
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  #35  
Old 08-01-2015, 02:20 PM
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The stem extension is 7.5 mm at 90F ambient which I think = failed.

Edit: I think this T stat and housing may have been messed with. The end cap for the stat (item 83, Mercedes calls it a valve seat) was very loose and required no torque to remove.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Last edited by funola; 08-01-2015 at 02:44 PM.
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  #36  
Old 08-01-2015, 02:40 PM
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Quote:
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.......I'll do that same test with my good one to confirm.............
What test?
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #37  
Old 08-01-2015, 02:46 PM
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Quote:
Originally Posted by funola View Post
What test?
Pouring water...

I've got 4.61mm stem extension on my good thermostat.
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  #38  
Old 08-01-2015, 02:52 PM
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Quote:
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Pouring water...

I've got 4.61mm stem extension on my good thermostat.
I don't think that is a valid test after looking at my stat. Those 4 vent holes will let the water through and will also let oil through to the cooler before the stat opens. So I don't understand the FSM test that says you should get a sudden rise in temp at the inlet of the oil cooler when the oil reaches the opening temp of the stat.

Edit: I mis spoke. Those 4 holes are the path of oil flow to the oil cooler. How are they sealed against the housing when the stat is closed? I'll have to take a closer look at the housing.
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Last edited by funola; 08-01-2015 at 03:03 PM.
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  #39  
Old 08-01-2015, 02:57 PM
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I don't think that is a valid test after looking at my stat..
Yea, I'm agreeing with you on that.
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  #40  
Old 08-01-2015, 06:52 PM
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mach4, do you know if p/n 1171800175 is the 110C T stat?

It's $47.50 from mbpartsworld REGULATOR. ENGINE LUBRICATION; OIL FILTER made by Mercedes Benz. #1171800175

but $37.95 from ecstuning
1171800175 - REGULATOR,OI - ES#1644529

Anyone buy from these outfits before?
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Last edited by funola; 08-01-2015 at 11:24 PM.
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  #41  
Old 08-01-2015, 07:05 PM
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I have no clue...

I was running 180F on the trip back from the junk yard today.
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  #42  
Old 08-01-2015, 07:35 PM
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Just spoke to ECS. They will check with their Mercedes specialist on Monday if it's the 110 C stat and if it is available from Mercedes. They also have the gaskets. I don't think it is a good idea to put in a used stat considering what can happen if it fails in the wrong position.
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Last edited by funola; 08-04-2015 at 11:20 AM.
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  #43  
Old 08-01-2015, 07:47 PM
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Make sure you get the waffle gasket

You want the one on the right...notice the difference in texture and thickness compared to the non-MB one!



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  #44  
Old 08-02-2015, 09:49 AM
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Quote:
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Make sure you get the waffle gasket

You want the one on the right...notice the difference in texture and thickness compared to the non-MB one!
I will thanks.
Have you checked your pressure relief valve? Pushed hard on mine with a stick and it didn't move. Made a tool to get the screw cap off but it's too tight-need to apply more torque to get cap off. Meanwhile took cover off the other ports to look at the pressure relief valve and noticed a rod inside the spring which should not be there per parts diagram. Can you check yours?
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #45  
Old 08-02-2015, 05:42 PM
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I tested the pressure relief valve and it works fine. Takes a fair amount of pressure, but that's to be expected given the pressure it's designed to open at. Haven't made a tool to open it up so can't comment on that aspect.
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