c.
Cleaning, Inspection, and Repair.
(1) Clean all parts in an approved cleaning solvent.
(2) Inspect all parts for excessive wear or damage. Replace as necessary.
d. Assembly.
(1) Position variable speed lever (4) on variable speed lever support pin (2), and secure with cotter pin
(8) and flatwasher (7).
(2) Install cotter pin (12), spring (10), and retainer (9) on governor adjusting screw (11).
(3) Position adjusting screw swivel pin (5) in variable speed lever.
(4) Screw governor adjusting screw (11) into adjusting screw swivel pin and secure with locknut (6).
(5) Position governor control chain cotter pin (24) in variable speed le el (4), and secure with screw
v
(3).
e. Installation.
(1) Screw variable speed lever support pin (2) and lockwasher (1) into manifold.
(2) Connect governor spring (16) to adjusting screw (11) and governor shaft lever (19, fig. 25).
(3) Position governor control knob (17, fig. 21) in front panel mounting hole, and secure with nut (22).
(4) Connect governor control knob rod to governor control chain (23) with cotter pin (18).
(5) Adjust governor controls (para. 74).
76. Engine Governor Assembly
a. General. The engine governor automatically controls the constant speed of the engine be centrifugal
force acting or a pair of flyweights which overcome the tension of a spring to control the flow of fuel
from the carburetor to the engine. The governor is housed in the upper part of the timing gear housing
and is driven by the camshaft gear.
b. Removal.
Warning: If NBC exposure is suspected, all air filter media should be handled by personnel wearing
protective equipment. Consult your unit NBC Officer or NBC NCO for appropriate handling or disposal
instructions.
(1) Remove canopy (para. 68), and remove air cleaner hose.
(2) Disconnect choke wire at carburetor (para. 68).
(3) Disconnect governor and throttle controls (para. 75).
(4) Loosen nuts, and remove oil lines.
(5) Remove four bolts and lockwashers securing governor (1, fig. 25), and remove governor.
c. Installation.
(1) Position governor (1) on engine, and secure with four bolts and lockwashers.
(2) Position oil lines on governors, and secure with nuts.
(3) Connect governor spring (16, fig. 21). Connect throttle control rod (13) with nut (15).
(4) Connect choke wire to carburetor (para. 68).
(5) Install air cleaner hose and canopy (para. 72).
77. Carburetor
a. General. The carburetor is an updraft single-venturi design. It has a semi-concentric fuel bowl which
allows engine to operate without flooding or starving in rough terrain.
b. Adjustment.
(1) Remove nut (15, fig. 21) securing the throttle control rod to the governor cros shaft and lever (19,
s
(2) Start the engine, and let it run until it reaches the normal operating temperature (para. 34). Push
the choke all the way in.
(3) Move the governor control lever until the engine runs at idle speed. Turn the idle adjusting screw
counterclockwise until the engine falters; slowly turn the screw clockwise until the engine runs
smoothly. Stop the engine.
(4) Position the throttle rod (13, fig. 21) in the governor cross shat and lever (19, fig. 25), and secure
f
spring (16, fig. 21).
c. Removal.
(1) Disconnect the governor control rod (13, fig. 21).
(2) Remove the air cleaner hose (4, fig. 20).
Change 7
43
