3-10. VARIABLE SPEED MECHANICAL GOVERNOR - MAINTENANCE INSTRUCTIONS.
The variable speed mechanical governor performs the following three functions:
Controls the engine idle speed.
Limits the maximum no-load speed..
Holds the engine at any constant speed, between idle and maximum.
The mechanical engine governor is identified by a name plate attached to the governor
housing. The letters S-W.-V.S. stamped on the name plate denote a single-weight variable speed governor.
The governor is mounted on the front end of the bower, and is driven by a blower rotor. The
governor assembly consists of three subassemblies:
Control Housing Cover.
Variable Speed Spring Housing and Shaft.
Control and Weight Housing.
Two manual controls are provided on the variable speed governor; a governor stop lever and
a speed control lever. For starting, the governor stop lever is moved to the RUN position; this moves the
injector control racks to the FULL FUEL position. Upon starting, the governor moves the injector racks out to
the position required for idling. The engine speed is then controlled manually by movement of the speed
The centrifugal force of the revolving governor weights is converted into linear motion, which
is transmitted through the riser and operating shaft to the operating shaft lever. One end of the operating shaft
lever bears against the variable speed spring plunger, while the other end provides a changing fulcrum on
which the differential lever pivots.