What causes hunting of diesel engines?
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“Hunting” is the term generally applied to an engine that will not maintain a constant speed with a fixed throttle setting. Most modern engines with electronic feedback controls do no have this problem. It is usually found in older diesels that use a “governor” to control speed. The governor is a centrifugal weight system that applies force to a spring-loaded fuel flow control. Hunting is caused when the linkages become worn and sloppy, causing a variable relationship between engine speed and fuel feed rate.
