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Bent connecting rod after Hydrolock Same connecting rod, turned 90°. Hydrolock (a shorthand notation for hydrostatic lock or hydraulic lock) is an abnormal condition of any device which is designed to compress a gas by mechanically restraining it; most commonly the reciprocating internal combustion engine, the case this article refers to unless otherwise noted.
Vapor lock is a problem caused by liquid fuel changing state to vapor while still in the fuel delivery system of gasoline-fueled internal combustion engines.This disrupts the operation of the fuel pump, causing loss of feed pressure to the carburetor or fuel injection system, resulting in transient loss of power or complete stalling.
A flooded engine is an internal combustion engine that has been fed an excessively rich air-fuel mixture that cannot be ignited. [1] This is caused by the mixture exceeding the upper explosive limit for the particular fuel. An engine in this condition will not start until the excessively rich mixture has been cleared. [2]
When an engine is shut down in flight, the design of the engine causes some parts to cool quicker than others. Since materials change sizes in different temperatures, this happens to the turbine engine. Core lock happens if the engine's parts change too much in size, then some parts will get stuck, reducing or even stopping rotation.
Most pilot operating handbooks for aircraft with reciprocating fuel injected engines describe specific procedures for starting the engine(s) after a recent shutdown while the engine is still "hot" in an attempt to avoid a vapor lock condition in the fuel feed lines or injector lines and enable a successful engine restart.
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Such a "locked-in" or self-reproducing stall is particularly dangerous, with very high levels of vibration causing accelerated engine wear and possible damage, even the total destruction of the engine through the breaking of compressor and stator vanes and their subsequent ingestion, destroying engine components downstream.
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