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#1
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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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JBG 1985 TD wagon, 228k running on grease since 3.07 AUSTIN, TEXAS |
#2
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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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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. ![]() ..I also have a 427 Cobra replica with an aluminum chassis. |
#3
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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
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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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JBG 1985 TD wagon, 228k running on grease since 3.07 AUSTIN, TEXAS |
#5
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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
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Now's the time to replace that 2" piece of bypass hose too.
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Chad 2013 Jeep Unlimited Rubicon OBK#44 "Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.) SOLD 1985 300TD - Red Dragon 1986 300SDL - Coda 1991 - 300TE 1995 - E320 1985 300CD - Gladys 2006 Nissan Pathfinder LE 1998 Acura 3.0 CL |
#7
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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
__________________
JBG 1985 TD wagon, 228k running on grease since 3.07 AUSTIN, TEXAS |
#8
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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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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!! ![]() 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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