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#1
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Expansion tank, '84 300D
Anybody know if a tank is made that doesn't have that second large outlet on the side? The stopper kit is only $10 but I don't like the idea of having another potential leak spot. I'm trying to think if I could fab a more permanent plug.
The one on the side, you can see the opening. Used on some rig, but not mine.
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1986 300SDL, 362K 1984 300D, 138K |
#2
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The hole on the side is for the coolant level sensor, used on the W126. Once plugged, that bung shouldn't ever leak. The sensor that goes in that hole is sealed with an O-ring and retained with a snap ring.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#3
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Assuming that stopper is threaded; degrease the inner and outer threads and use the slow curing JB Weld Epoxy and screw it in and it will likely out last the rest of the tank.
Loctite that can take the coolant temp on the threads I think would also work to seal it off.
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84 300D, 82 Volvo 244Gl Diesel |
#4
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You could also fit a sensor and retrofit a light on the dash or the cluster to tell you when your coolant is low.
What I really miss on 85 and older benzes is that they don't have low oil or low coolant sensors (lowers the chance of your motor blowing up) and no light control module light (keeps you from being pulled over for having a light out) |
#5
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Quote:
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1986 300SDL, 362K 1984 300D, 138K Last edited by cmac2012; 09-26-2020 at 05:04 PM. |
#6
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I was starting to go there. Why fight it, this tank must have a small crack underneath. Need a new one.
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1986 300SDL, 362K 1984 300D, 138K |
#7
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I have serviced these Mercedes diesels over the last 30 years, thousands, have never even
seen one leak, at this place. Buy the plug and be done with it. |
#8
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What he says. Buy the plug kit with confidence, and install.
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Marshall Welch Seattle, WA 1982 300D-T |
#9
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Quote:
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84 300D, 82 Volvo 244Gl Diesel |
#10
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There are no threads. If you took the time to read the rest of this thread or look at the picture of the tank in the OP, you would know that by now.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#11
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Quote:
The SDL sensor looks lke it would work.
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1986 300SDL, 362K 1984 300D, 138K |
#12
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Quote:
A 300SDL has a very different tank to what's in your 1st post. Would have to look up the epc to see if it's the same sensor. It looks like a tank in my 300SE. Try looking up a sensor for a 300SE (1990 for example) if you want to do the retrofit Last edited by Usaguy; 09-27-2020 at 07:19 AM. |
#13
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My experience comports with the above.
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#14
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Quote:
Also: I'm thinking that if a retrofit was done, it could be optimal to connect the trigger wire (I don't know if it is the positive or negative) to the buzzer under the dashboard instead of to a light. This would be the quickest way to get the driver's attention. Last edited by 5cylinder; 09-27-2020 at 01:15 PM. |
#15
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Quote:
Good advice on the 300SE, I looked it up, it uses the coolant tank advised for the 300D and the level sensors are the same for the SDL. The price difference is a bit puzzling, the Febi goes for $6, that's less than for the plug kit ($10.94)! I don't know if I'm a fool for thinking the higher priced units will be better quality. It's often the case but who knows. Speaking of the SDL, while I was searching on this issue I found this thread from 5 years ago: http://www.peachparts.com/shopforum/diesel-discussion/371809-300sdl-coolant-expansion-tank-retrofit-tank-300sd.html Good food for thought. My SDL doesn't leak (yet) but it is as opaque as hell. With my really bright little LED work light I can see the coolant level but only with that. The SDL tank looks like it might be larger capacity. Who knows, I suspect the tank in question, the other W126 tank would be big enough.
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1986 300SDL, 362K 1984 300D, 138K |
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