THAW A FROZEN ENGINE
he best way I’ve found to break loose a seized or “frozen” engine is to remove the head and fill the cylinders with ordinary brake fluid (not silicone). Let it stand a few days, and the engine will almost always free up. I’ve found that brake fluid works far better and faster than Liquid Wrench, diesel fuel, kerosene, or any other “methods I’ve ever heard of, including on engines with cast-iron pistons. Never hammer on the tops of the pistons, even with a wooden block, to try to fee them. Instead, remove the flywheel cover and use a stout pry bar on the flywheel teeth. Try to turn the flywheel in both directions. You’ll probably find that it will begin to move slightly at first. Then keep rocking it back and forth, and it will go a bit farther each time until the engine is finally free again. Naturally, you’ll change the oil before attempting to start the engine. Remember that brake fluid also removes paint quite, so don’t spill it on your vehicle’s bodywork.
