EmTee Posted December 1, 2022 Share Posted December 1, 2022 me 2... 1 Link to comment Share on other sites More sharing options...
Bloo Posted December 1, 2022 Share Posted December 1, 2022 1 hour ago, EmTee said: Wow - I can see where that 90* bend that the tube makes to point up the venturi could be a problem. It seems crazy the way those tubes bend around to squirt into the venturi, given that more modern carburetors simply shoot a stream of gas at the throttle valve to accomplish the same thing! If you can't clear the jam, I would seriously consider cutting the tube ahead of the point where it enters the venturi and is just pointing down into the throttle body. Then fill the empty holes in the venturis with epoxy... You've missed a detail though. This isn't just the accelerator pump It's also the enrichment fuel from the power valve. That fuel would be added to the fuel from the main jets and come out the main discharge tubes on most other designs. On this one, it apparently comes out the accelerator pump squirters, so they have to mix fuel with air in the venturi about as well as the main discharge tubes do. 3 1 Link to comment Share on other sites More sharing options...
Rock10 Posted December 1, 2022 Author Share Posted December 1, 2022 Well I got it cooking in a crock pot with 50/50 Evapo-Rust and water. Thinking about throwing in some potatoes and carrots. Any seasoning tips? 1 2 Link to comment Share on other sites More sharing options...
EmTee Posted December 1, 2022 Share Posted December 1, 2022 A little garlic would probably help. 10 hours ago, Bloo said: This isn't just the accelerator pump It's also the enrichment fuel from the power valve. Ugh - forgot about that... 2 Link to comment Share on other sites More sharing options...
Rock10 Posted December 2, 2022 Author Share Posted December 2, 2022 Well, bad news. It appears Evapo-rust has a bad effect on whatever these carbs are made of. After soaking overnight in a 50/50 water mixture on the warm setting, I opened up the pot to see the water was gray. I pulled the carb out to see it was gray also and had a rough texture and left gray residue on my hand. I have it soaking in a water/Simple Green solution to hopefully stop the action, but I fear I have damaged the carb. 🤕 Link to comment Share on other sites More sharing options...
Bloo Posted December 2, 2022 Share Posted December 2, 2022 Ouch! Wow. I have soaked zinc, brass, aluminum, etc in it and not had a problem. The maker says it only reacts with Iron oxide, and leaves other metals alone. Up until now, it seemed to be true. Sorry for suggesting it. Keep us posted. Link to comment Share on other sites More sharing options...
edinmass Posted December 2, 2022 Share Posted December 2, 2022 (edited) Nope…….evapo will not touch or damage anything. It removes oxygen with a synthetic molecule. It’s harmless. You have unstable metal. By 1932 Stromberg had all their pot metal issues fixed. Most likely you carb is suffering from exposure. Having serviced countless Stromberg units I have never seen any issues post 1932. Edited December 2, 2022 by edinmass (see edit history) 1 Link to comment Share on other sites More sharing options...
Bloo Posted December 2, 2022 Share Posted December 2, 2022 Evporust is very sugar-like, and will wash off with water or soap and water. That is probably quickest if you just want it gone. 1 Link to comment Share on other sites More sharing options...
Rock10 Posted December 2, 2022 Author Share Posted December 2, 2022 49 minutes ago, Bloo said: Ouch! Wow. I have soaked zinc, brass, aluminum, etc in it and not had a problem. The maker says it only reacts with Iron oxide, and leaves other metals alone. Up until now, it seemed to be true. Sorry for suggesting it. Keep us posted. I know. I am surprised. Link to comment Share on other sites More sharing options...
Rock10 Posted December 2, 2022 Author Share Posted December 2, 2022 13 minutes ago, edinmass said: Nope…….evapo will not touch or damage anything. It removes oxygen with a synthetic molecule. It’s harmless. You have unstable metal. By 1932 Stromberg had all their pot metal issues fixed. Most likely you carb is suffering from exposure. Having serviced countless Stromberg units I have never seen any issues post 1932. Everything looked great before. I've soaked it in gasoline and paint thinner and dish soap and water and it looked fine until the overnight in Evapo-rust. My Simple Green soak didn't appear to be doing anything so I put it back in the gas to soak. The exterior surface is slightly gritty and the inside leaves a gray residue on your hands like old water pipe. I'll post pics tomorrow. 2 Link to comment Share on other sites More sharing options...
Rock10 Posted December 2, 2022 Author Share Posted December 2, 2022 13 minutes ago, Bloo said: Evporust is very sugar-like, and will wash off with water or soap and water. That is probably quickest if you just want it gone. Soap and water didn't seem to help. 1 Link to comment Share on other sites More sharing options...
EmTee Posted December 2, 2022 Share Posted December 2, 2022 Maybe the Evaporust was reacting with a layer of surface oxidation and as Ed suggested, the gray sludge is 'dead' metal. I guess what I'm hoping is that the rest of the metal is still OK. How does it look inside, especially the area in the fuel bowl that would normally be filled with gasoline? Is that area also rough? 1 Link to comment Share on other sites More sharing options...
edinmass Posted December 2, 2022 Share Posted December 2, 2022 Evaporust is not an acid. The synthetic compound binds with oxygen……so it converts rust into iron oxide, it can not physically attack anything. Thus it’s safe for paint, brass, aluminum, ect. Whatever is on the carb after heating it I have no clue. Porous and bubbles on the surface of post 1932 Strombergs are usually only found on castings that have been weathered. Any appearance of swelling or pitting usually means the carb is going to continue to deteriorate. Heat cycles and unseated garages will accelerate the failure over time. We have glass beaded them in the past and then treated them with zinc chromate but it’s a very dangerous process and it’s very difficult to get access to it. 2 Link to comment Share on other sites More sharing options...
Rock10 Posted December 3, 2022 Author Share Posted December 3, 2022 (edited) Here are some pics. The first is the liquid after the soak. You can see it is separating. There were small particles in the bottom of the pot. Next is the carb. You can see the rough texture and the change in color. It feels like about 220 grit sandpaper. All I did was soak it in 50/50 Evapo-Rust and water on the "warm" setting overnight. Edited December 3, 2022 by Rock10 (see edit history) Link to comment Share on other sites More sharing options...
Rock10 Posted December 3, 2022 Author Share Posted December 3, 2022 For reference, here is a pic of the carb before I started. The dirt was cleaned off before it went into the solution. Link to comment Share on other sites More sharing options...
Rock10 Posted December 3, 2022 Author Share Posted December 3, 2022 15 hours ago, edinmass said: Evaporust is not an acid. The synthetic compound binds with oxygen……so it converts rust into iron oxide, it can not physically attack anything. Thus it’s safe for paint, brass, aluminum, ect. Whatever is on the carb after heating it I have no clue. Porous and bubbles on the surface of post 1932 Strombergs are usually only found on castings that have been weathered. Any appearance of swelling or pitting usually means the carb is going to continue to deteriorate. Heat cycles and unseated garages will accelerate the failure over time. We have glass beaded them in the past and then treated them with zinc chromate but it’s a very dangerous process and it’s very difficult to get access to it. I agree. I was concerned about using vinegar so I went with the safe solution. I'm glad I didn't leave it in for 24 hours like I started to. The inside surfaces don't seem to be degraded but everything is gray. Link to comment Share on other sites More sharing options...
EmTee Posted December 3, 2022 Share Posted December 3, 2022 (edited) It looks to me as though the Evaporust reacted with oxidation on the surface, which it is designed to do. If the inside is still smooth it should be OK. Maybe light glass beading followed by a sealer would restore the appearance/color? The big question: Are the tubes clear? Edited December 3, 2022 by EmTee (see edit history) 1 Link to comment Share on other sites More sharing options...
Rock10 Posted December 3, 2022 Author Share Posted December 3, 2022 9 minutes ago, EmTee said: It looks to me as though the Evaporust reacted with oxidation on the surface, which it is designed to do. If the inside is still smooth it should be OK. Maybe light glass beading followed by a sealer would restore the appearance/color? The big question: Are the tubes clear? I guess that's possible, but the outside was smooth and clean, just like the inside and I thought it was safe for all metals. Good news: one tube is all clear. The other is not. I don't know how clogged it is. Trying to blow back through it. I think trying to blow from the well out through the tubes caused my problem and has packed stuff into the smallest part. Still working on a method to get the job done. I got a swizzle stick/straw that fits over them nicely and allows a spray tube from carb cleaner to fit in the other end. But I can't get it on the clogged tube. The end is cut too sharp and bent too tight. It just slices the straw. 1 Link to comment Share on other sites More sharing options...
Rock10 Posted December 3, 2022 Author Share Posted December 3, 2022 I have air flowing through both tubes now. Not sure how to judge how much. Other than the color change, I don't see any permanent damage to the carb body. Still have to get the tubes back in the nozzles. 4 Link to comment Share on other sites More sharing options...
EmTee Posted December 5, 2022 Share Posted December 5, 2022 Can you poke a fine wire through the tubes now? Link to comment Share on other sites More sharing options...
Rock10 Posted December 5, 2022 Author Share Posted December 5, 2022 2 hours ago, EmTee said: Can you poke a fine wire through the tubes now? No. Still don't have a good angle. 1 Link to comment Share on other sites More sharing options...
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