The main engines on your harbor tug are equipped with over speed trip devices as shown in the illustration. By what method is the engine shutdown on an over speed condition? Illustration MO-0171

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A trip shaft cam positions all the unit injectors plungers to the bottom of their respective strokes, preventing plunger reciprocation, which results in engine shutdown.

Answer

A trip shaft cam positions all the unit injectors plungers to the top of their respective strokes, preventing plunger reciprocation, which results in engine shutdown.

Answer

The fuel control linkage controlling the unit injector racks goes to the no fuel position, which results in engine shutdown.

Answer

A solenoid valve in the common fuel supply line to the unit injectors is closed, which results in engine shutdown.

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