I have a bolt siezed in my thermostat housing that will not come out despite my best efforts. I need to get one from a junk yard (I can't find one new and I cringe to think of the cost for a new one anyway.) Would the housing in a 300D be the same as that in the 300SD?

Thanks,

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B
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1983 300SD

It should be engine specific, not chassis specific.

That's good to know. The only thing I guess I can think of that might be different is that mine has a temperature sensor that controls the climate control. I don't recall the D that I looked at last year having that. But then again, I wasn't looking to compare housings either.

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B
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1983 300SD

If the car has ACC, it should have the temp switch. (My '82 300D has one.) In any case, the only thing the switch does is prevents the blower from trying to blow heat when the engine is cold. If you just ground the wire, the blower will work regardless of coolant temp. It's hardly worth having, in my opinion.

These are actually very standard bolts - available off the rack at Autozone and the like - any store that sells standard metric hardware.

Had the same thing happen on my 240D and thought it would be an expensive trip to the dealer. Was advised otherwise and had no problem finding a replacement in the auto store.

Standard size bolt.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

It's not getting the bolt that is the problem, it is seized inside my housing that is the problem and I can't get it out.

EDIT, I think I see the confusion, I need a new housing, not bolt, since the bolt is stuck inside my housing. My original post did not make that clear.

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B
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1983 300SD

When that happened to me, I was able to drill out the old bolt and re-tap for a new one.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer

Yes, that's what happened to me too. The head of the bolt is what turned off and there was enough bolt left to grind flats so I could get a wrench on it. The grinding vibration along with PB Blaster broke it loose enough to get it out.

Definitely a place for anti-seize!

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

This one is not coming out. I tried a few methods, the last of which was to use an easy-out, which then broke off inside the bolt. I'm guesing maybe it was cross threaded into the housing? I don't know, but that sucker does not want to turn, at all.

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B
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1983 300SD

yikes, those easy outs give me the willies.

although the stat houseings should bolt up to either engine, it seems possible that the angle of the hose connection might be different.

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.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

After doing some checking, it appears that the 116 models with the 617.95 engine had the temp switch in the thermostat cover, instead of in the housing itself.
What year is the 300D?

Another option might be to drill the existing bolt completely out. Then use a longer bolt with a nut on the back of it, instead of the bolt threading into the housing. (ie, the bolt will go all the way through the housing.) Looks to me that there would be adequate room for the nut.

I think the angle of the hose connection was different on 'older models' vs. 'newer models.' I believe that's what my Haines manual says, anyway (it's not here with me to look at).

I don't know when the design changed.

Edit: I would assume this would be the same for the w126...

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Ralph

1985 300D Turbo, CA model
248,650 miles and counting...

I don't know the year of the 300D. I'll have to ask.

That is a viable option, drilling it out and through bolting it. I think I'd like a drill press to do that though, which I don't have. Maybe it's time to buy one. Either way, holding the housing steady while I drill is going to be difficult, and keeping it center difficult as well, now that there are two different types on metal in the bolt.

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B
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1983 300SD

i think it will be hard to seal a thru bolt.

i am pretty sure someone will have a good used one for you. i prob have several off 123 240 motors and at least one off the 115 240 motor if you can determine if they will fit yours.

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.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I don't even think you could buy a new thermostat housing, could you?

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Der Panzermann und Fraulein Fahrvergnuegen

1991 420SEL 201K "The Big Blue One"
1985 300DT 205K chassis/285K engine nee California emissions "Goldbug"
1983 300TDT 255K "The Womble"
1983 300 DT 214K "Sea Sprite"-Rear-ended a truck
1983 300SD 285K "The Donor" Gave his life so that others can live
1980 500SL Euro 105K "Der Panzer"