Each time, approaching any mechanism that has long required inspection and maintenance, the owner scratches his head disappointingly. Outside, the mechanism, as a rule, is already pretty damaged by rust, and for sure all the connections are firmly grabbed. And so every time, before unscrewing the stuck bolt. It can discourage all the desire to work!
And this is what happened. When tightening the bolt, the necessary tightness was not achieved, moisture penetrated into the threaded connection, and the reaction of water with iron in the presence of oxygen gave hydrated iron hydroxide, that is, rust. She clogged the thread with herself, the connection jammed. Well, how to unscrew the stuck bolt, if the connection has not been untwisted for years?For a start, you can try to dissolve the rust. Glycol, a substance found in antifreeze or brake fluid, does this well. A moistened rag is placed on the stuck thread, the glycol will penetrate the rust, loosen it, and it will immediately become easier to unscrew the rusted screw.
Penetrates well into micro thread gapskerosene, and also white spirit solvent. Therefore, craftsmen from auto repair shops in difficult situations like to use WD-40 aerosol, half consisting of white spirit. To help the liquid penetrate the thread better, you can lightly tap the bolt head with a hammer. You should wait no more than 10 minutes. And there is, so to speak, a scientific way to unscrew the stuck bolt. Around the bolt head, you need to build a side of plasticine or wax, put a little zinc inside and pour sulfuric acid. She will not have time to corrode the fasteners, because she will immediately attack the rust and, reacting with zinc, will begin to restore iron on the surface. The chemical reaction will literally scrub the rust out of the threads.
If it doesn't work, you can resort to heating the bolt, then you need a gas burner (or a soldering iron). A bolt heated to about 230 degrees should cool down. During the heating/cooling process, the changed geometry of the metal will destroy the rust to the extent that the threads will be free for the penetration of liquid lubricants. And then there should be no problems with how to unscrew the bolt.
When unscrewing, there should be a high-quality, reliable and proven tool in your hand. Of course not made in China. Open-end wrenches are ineffective in such a case - you will get crumpled bolt heads and knocked-down hands from breakdowns. Use spanners and sockets. Unscrew back and forth, rocking, as if cutting a thread or pulling a stuck car out of the mud. In this case, the penetration into the thread of the lubricant
There are also more radical and extreme ways to unscrew a stuck bolt. First, tap the bolt head from above with a hammer - this will break the rust structure. Then, using a chisel or a strong screwdriver and a hammer, tap all the faces of the head in turn, directing the blows along the axis of rotation. In the vast majority of cases, a stubborn bolt should give in and twist out. One last thing. When you re-tighten the bolt, please do not forget about graphite grease, grease or engine oil. Then the carving will not be afraid of corrosion or oxides for many years.
