The diesel generator on service on your anchor-handling supply vessel is undergoing cyclic, rhythmic variations in speed at steady load. When the governor output shaft is disconnected from the fuel control linkage and the linkage is blocked manually, these variations in engine speed stop. What would be an appropriate corrective action?
• Governor hunting (cyclic speed variation at steady load) • Difference between fuel system problems vs. governor/control problems • Role of compensating needle / damping in governor stability
• If the speed fluctuation disappears when the fuel control linkage is held steady by hand, what does that tell you about whether the problem is in the governor or in the injectors/cylinders? • What part of a mechanical governor is responsible for smoothing out or damping rapid changes to prevent hunting? • Which option affects stability and damping of the control system, rather than fixing mechanical looseness or individual-cylinder problems?
• Confirm which component directly affects damping / stability of the governor’s control action. • Check whether a misfiring cylinder would stop causing speed variation just because the governor linkage was blocked. • Consider whether loose governor base bolts or worn drive gears would neatly stop the symptom when the linkage is held fixed.
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