Posted by Steve@Advance on July 21, 2018 at 10:50:56 from (66.169.147.211):
In Reply to: Seized piston posted by JimS on July 21, 2018 at 10:12:31:
As you say, there are a lot of methods to free a stuck or seized engine.
Stuck and seized are different terms. Stuck is usually less destructive if caught in time. Seized is almost always not going to be usable without disassembling and correcting the problem.
The first thing to do is evaluate the situation. An engine that sat for years and is stuck with condensation rust, or even an engine that sat for a relatively short time with water in the cylinders, either from a head gasket leak or from an external source, can sometimes be freed with soaking with penetrant and bumping the starter.
But an engine that sat with liquid water in the cylinders for years likely will not free up, and if it does, real good chance the rings will be stuck and the cylinders pitted to the point it will not be practical to use.
If it won't break loose without a real fight, might as well take it apart and see what needs to be done. If it has sleeves, usually easier to just pull the sleeve with the piston in it and replace both. If no sleeve, a block of wood whittled to fit, and a big hammer (after the rod is disconnected) will usually get it broke loose, then drive it out from underneath. At this point you're not trying to save the piston unless it's something rare.
A seized engine will generally need to come completely apart to inspect each cpmponent and clean out the fine shrapnel in the oil galleys.
Rods are not usually ruined, but can be damaged. They can be reconditioned if not beyond repair.
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