TM 5-3895-359-14&P
GOVERNOR OPERATION
The governor rod connection to the carburetor must be very
The centrifugal flyball governor rotates on a stationary carefully adjusted for length, otherwise the governor will not
pin driven into the upper part of the timing gear
function properly and cause the engine to surge badly. With
the engine at rest, the governor spring will keep the flyweights
in, and the control rod must be of such length as to hold the
carburetor throttle wide open at that point. The accuracy of
this adjustment can be tested by disconnecting the control rod
from the governor lever, and then pushing the rod toward the
carburetor as far as it will go. This will open the throttle wide.
The governor lever should then be moved as far as possible in
the same direction, all of this being done with the rod
disconnected from the lever. Holding both parts in the above
position, the rod should be screwed into the swivel block on
the carburetor, until the bent end of the rod will register with
the hole in the lever, then, screw the rod in two more turns.
Insert the rod into the hole in the governor lever and assemble
cotter pin. With the governor lever pushed toward the
carburetor as far as it will go, there should be about a 1/16
inch clearance between the throttle lever and the stop pin on
the carburetor. The clearance will cause the lever to bounce
back from the stop pin, rather than jam against the pin, when a
FIGURE 26
104726C-A
load is suddenly applied to an idling engine. This will
eliminate excessive wear on the threads in the carburetor
throttle swivel block.
FIGURE 27
180186C
cover, and the governor is driven off the camshaft gear
at crankshaft speed.
Flyweights are hinged to lugs on the drive gear.
Hardened pins on the flyweights bear against the
flanged sliding sleeve, moving it back and forth as the
flyweights move in or out. The motion of the sleeve is
transmitted through a ball thrust bearing to the governor
lever, which in turn is connected to the carburetor
throttle lever. A spring connected to the governor lever
tends to hold the governor flyweights to their inner
position, also to hold the carburetor throttle open. As
the engine speed increases, the centrifugal force in the
flyweights acts against the spring and closes the throttle
FIGURE 28
to a point where the engine speed will be maintained
The governor lever is furnished with 12 holes, as shown in Fig.
practically constant under varying load conditions. This
28, for attaching the governor spring. It is very important that
speed can be varied to suit conditions by adjusting the
the spring is hooked into the proper hole to suit the speed at
governor spring tension to suit.
which the engine is to be operated. The Governor Lever
Fig. 8. Checking Rack and Plunger for Free
Chart, Fig. 28, shows the full load
Movement with J 22396
14-13
