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Heres one way to unseize an engine, I know it works on single cyl engines but should work on any type. First you take an old spark plug and break all the porceline off and out of the plug, then cut off the ground tab which is above where the electrode was. Now you will have just the threads with a hole all the way through it. Take a grease zert / grease nipple and weld it to the top of the plug. First soalk each cylinder in penetrating oil over night, then thread the modified plug it in to the engine, put a grease gun on the nipple and pump grease into the cylinder. Make sure you do a good weld job so the grease doesnt escape from the cylinder. Make sure you use this on a cylinder which is mid stroke, not TDC or BDC. The pressure provided by the grease gun should be enough to pop the piston loose and it applies even pressure to the top of the piston as well which reduces the chance of breaking a ring, at least on the one cylinder you are using it on. Good luck, C.O. Michetti.
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The simple answer is: Yes. It can free up the engine and I'm sure it wont cause any harm. I've used this method several times in the past and recommend trying WD-40 first. But really any penetrating oil will work just fine. Heck, I've even been successful with used motor oil! But I do not recommend using that because there are fine particulate in it that may cause damage.
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How do you unseize the emergency brake on a 1986 Econoline?
Well, you can get a new one. Or you can go underneath and soak it in WD40, go in the vehicle and try to move it, then soak it again and let it sit for awhile. Repeat and if it doesn't come loose, It may be rusted together, take it in and get it replaced.
