Each time, approaching any mechanism, alreadylong requiring inspection and maintenance, the owner disappointedly scratches his head. Outside, the mechanism, as a rule, is already pretty spoiled by rust, and surely all the compounds are firmly caught. And so every time, before you unscrew the stuck bolt. All the hunt to work can discourage!
And that's what happened.When the bolt was tightened, the required tightness was not achieved, moisture penetrated the threaded joint, and the reaction of water with iron in the presence of oxygen gave hydrated iron hydroxide, that is, rust. She hammered the thread, the connection is jammed. Well, how to unscrew the stuck bolt, if the connection is not unwound for years?
For starters, you can try to dissolve rust.It does well glycol - a substance contained in antifreeze or brake fluid. The wetted rag is placed on the stuck thread, the glycol will penetrate the rust, loosen it, and unscrew the rusted screw immediately becomes easier.
The thread micro-gaps also penetrate well.kerosene, and even solvent white spirit. Therefore, craftsmen from auto repair shops in difficult situations like to use WD-40 aerosol, half consisting of white spirit. To better penetrate the liquid thread, 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,how to unscrew the stuck bolt. Around the head of the bolt need to build a side of clay or wax, put a little zinc inside and pour sulfuric acid. She will not have time to fasten the fasteners, because she will immediately attack rust and, reacting with zinc, will begin to restore iron on the surface. The chemical reaction will literally clean the rust from the thread.
If it does not work, you can resort toheating the bolt, then a gas burner (or soldering iron) is required. Preheated to approximately 230 degrees, the bolt should cool down. In the process of heating / cooling, the changed geometry of the metal will destroy the rust so much that the thread turns free for the penetration of liquid lubricants. And then problems with how to unscrew the bolt, should not be.
When unscrewing in hand should be of high quality,reliable and proven tool. Needless to say, not made in China. The wrenches in this case are ineffective - get the heads of bolts crumpled by them and knocked hands from failures. Use spanner keys and heads. Twist back and forth, squeeze, as if you are threading or pulling a stuck car out of the dirt. At the same time, the penetration of lubricant into the thread will increase.
There are also more radical and extremeways how to unscrew the stuck bolt. First, hammer the bolt head over the top - this will break the rust structure. Then using a chisel or durable screwdriver and a hammer, tapping all faces of the head in turn, directing blows to the axis of rotation. In most cases, a stubborn bolt must fall and wrench.
And the last. When you re-tighten the bolt, please do not forget about the graphite grease, grease or engine oil. Then the thread for many years, neither corrosion nor oxides will not be terrible.
