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  #1  
Old 05-07-2008, 05:59 PM
JBG JBG is offline
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Replacing Thermostat: 1985 TD wagon (w123)

1. Anyone give me a quick heads up as to where the thermostat is located, what it's next to, etc.

2. When ordering a replacement, is it necessary to get additional gaskets? There are two offered,
Thermostat Gasket/Seal; Seal Ring with Side Hole

and

Thermostat Gasket/Seal; Thermostat Housing to Cylinder Head


Is the idea to just get both gaskets and replace, better to be safe than sorry, or are they not necessary?

Thanks a lot.
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1985 TD wagon, 228k
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  #2  
Old 05-07-2008, 06:59 PM
t walgamuth's Avatar
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Location: Lafayette Indiana
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YOu shouldn't need the second one. Just follow the top hose to where it attaches to the engine. There is a bell with a nipple for the hose to attach to there. Its held on with three 10 mm bolts. put some wd40 on the bolts and very carefully jiggle them back and forth and work some oil down in the threads.

The take the stat out and put in the new one taking care to observe how the gasket and stat sits.

Reverse and refill.

Good luck

Tom W
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  #3  
Old 05-07-2008, 09:25 PM
minimike
 
Join Date: Oct 2007
Location: LI, NY
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when you try to remove any bolts.-- tighten them just a tiny cinch first then back them out. This will avoid all sorts of problems.
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  #4  
Old 05-08-2008, 09:48 AM
JBG JBG is offline
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Thanks T, mini. From what I understand now the thermostat kit includes the necessary O-ring and the other is not necessary. Unless I hear back about this I will probably buy both anyway as they are 83 cents and I'd rather not risk it. This probably sounds ludicrous to people who have done this job before, but I have not, so I'm kind of feeling my way through it.

Thanks again!
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1985 TD wagon, 228k
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  #5  
Old 05-08-2008, 10:49 AM
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Heed the advice on some sort of break free on the 10mm bolts before trying to remove them. They break very easily. If you do get them out never sieze on the way back in.
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  #6  
Old 05-08-2008, 10:55 AM
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Now's the time to replace that 2" piece of bypass hose too.
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  #7  
Old 05-08-2008, 11:12 AM
JBG JBG is offline
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Quote:
Originally Posted by Chad300tdt View Post
Now's the time to replace that 2" piece of bypass hose too.
Chad,

As far as I can see, that part isn't for sale (?)

(Link is broken up in 2 pieces to fit the whole thing...):

http://www.***************/search/product.aspx?sid=thhlis55lxaewmvdaceyyk45&makeid=800016@
Mercedes&modelid=1194342@300TDT&year=1985&cid=16@Cooling%20System&gid=2156@Cooling/Coolant%20Hose
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1985 TD wagon, 228k
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AUSTIN, TEXAS
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  #8  
Old 05-08-2008, 10:57 AM
vstech's Avatar
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that's all that's REQUIRED to change with a tstat swap.
however, once you get in there, look very carefully at the short hose below the tstat, and see if it's in good shape. it is very annoying to get a bunch of things changed, and reassembled just to find that a simple hose is leaking forcing you to take everything back apart.
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