In a diesel engine, does the governor of the injection pump limit the engine speed?

Question

DentroTest · Accepted Answer

The governor coupled to the injection pump controls the engine speed at both ends: the minimum (idle) and the maximum. At the low end, it acts on the fuel rack so that the engine does not stall for lack of fuel when running without load or under light load. At the high end, it cuts or reduces the supply to prevent the engine from racing and suffering damage from excessive revolutions. That is why it is not correct to say that it only limits the maximum speed, since it also regulates idle. Nor is it correct that its function is to adjust the flow according to the speed of the vehicle: the governor does not calculate the traveling speed, but responds to the revolutions and the demands on the engine.

In a diesel engine, does the governor of the injection pump limit the engine speed?

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