SPEED CONTROLLING DEVICES

In the EN3 TRAMAN, you learned some basic information about the methods and the devices that control the output of the injection pumps and injectors. The purpose of these devices is to ensure control of engine operation.

This chapter contains general information about maintenance and repair of speed controlling devices known as governors. You should refer to the appropriate manufacturers technical manuals and the maintenance requirements (3-M) for more specific information. Woodward Diesel Engine Speed Governors Operation and Maintenance Manual, NAVSHIPS 341-5017, Marquette Governor Maintenance Manual, NAVSHIPS 341-5505, and Naval Ships Technical Manual, Chapter 233, Diesel Engines, are good sources of information.

GOVERNORS

To control an engine means to keep it running at a desired speed, either with, or regardless of, the changes in the load carried by the engine. The degree of control required depends on the following factors:

l The engines performance characteristics

l The type of load it drives

In diesel engines, the speed and power output is determined by varying the amount of fuel injected into the cylinders to control combustion. Hydraulic and mechanical are the two principal types of governors.