My brass Master carb has badly rusted screws holding it together. Can they be loosened chemically in a bath, or is propane torch the way to loosen them?
Try a 500 watt soldering iron or torch heated iron with some PB blaster at the ready. ws
I have removed rusted machine screws from steel as follows;
Set a steel washer that fits around the screw. Then set a nut ( probably 5/16"). Grab the mig and turn up the heat a little. Weld it all together. Be sure to have a old piece of candle handy. As it cools melt a bunch of candle wax using the heat from the welding. Don't be shy about the wax. When it cools it should spin right out
Use a screwdriver that fits the screw and give it a rap or two with a hammer. This will compress the brass just enough to break the corrosion bond.
Kroil works wonders. No shop or work-bench should be without it. Once you use Kroil, you'll never use anything else.
Where can you buy Kroil, besides on the internet. It said industrial use only
Richard, if you put something like " Wolf Engineering" on the order form they will sell it to you. It worked for me.
Any industrial supplier should be able to source it if they don't already have access to it. I would inquire at your local industrial supplier and see what they say.
Heating something like that with a torch is risky. Complicated castings do not heat evenly, and can warp or break. There also may be zinc or pot-metal pieces, lead or solder that may melt, or other things.
I have to say, I have never done it. But I have heard that heating things like carburetors in an oven, where the heat is regulated and more even, is best. Often, not always, the the difference in thermal expansion will loosen steel screws from brass after a good thermal cycle.
Drive carefully, and enjoy, W2
Thanks, guys. I squirted Kroil on the screws before posting this, but these threads look to be beyond the creepiness of Kroil.
Thanks, Wayne, for the precautions. You reminded me: I have a toaster oven that will hold the carb, and I can run it up to 500F. I'll try that manana.
Rick, Try something like 250f as some metals melt at a very low tempt. Heating, cooling, heating a few times is safe and should do the trick. Scott