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9N'er..... ..Hydrostatic Lock...usually occures in an engine from a bad headgasket. But on N's can occure from a full gravity fed gastank and a bad float in the carb. Both cases, fluid gets into a cylinder of a stopped engine just before the "compression stroke". When you go to start the engine, the starter cranks the engine and the piston "tries" to compress the liquid in the cylinder. You might have noticed, liquids are rather incompressable, therefore you have just experienced "hydrostatic lock". To "un-lock", remove all sparkplugs and turn over the engine, thus forcing the incompressable fluid out the now open sparkplug holes. The reason for removing "all" the sparkplugs is: you don't know which cylinder has the fluid in it. Next step, find out why and fix it. You'll obviously need to replace your contaminated oil. I've never known a "running" engine to experience "hydrostatic lock". Engines that set over time will also "rust lock" their rings to the cylinder walls. "Olive oil" is an old timey "cure". Vapor lock is a different kind of pressure problem. Usually caused by heat, most commonally, boiling gasoline inside a gas line from being incorrectly routed too near an exhaust pipe. It used to plague old timey cars with poor fuel pumps. Since N-Tractors are gravity flow to the carb and therefore do not have fuel pumps, vapor lock is usually not a problem. Howsomever, if your fueltank vapor vent is "plugged" you can eventually "vaccuum lock" and stop your engine from running by preventing gas from draining into the carb..... ..Dell
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