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 TM 55-1925-204-12
NOTE
governor controls fuel input to keep engine speed near
Draw nuts down uniformly and after
constant under varying loads.
tightening, revolve the drive shaft of the
(1) Removal.
governor drive to check for binding.
(a) Remove rocker arm cover by
Parts must move freely.
unscrewing the hand nuts (fig. 5-4) then lifting rocker arm
(f) If the throttle control rod, and
cover (fig. 5-5), and gasket from the cylinder head.
mounting bracket was removed earlier, position the
(b) Disconnect fuel rod extension from
bracket with new gaskets on both sides over the fuel rod
the injector control tube lever at rocker arms.
of the subcover assembly. Position a subcover gasket on
(c) Remove end of the retracting spring
the governor housing.
from the throttle control arm (fig. 5-5), then remove
(g) Start the fuel rod of subcover through
cotter pin and pin from the arm.
hole in cylinder head, move gasket and bracket up to the
(d) Look at governors left side, at bottom,
head; at the same time push in on the fuel rod knob and
and disconnect the oil inlet line from the governor.
lower the subcover down on the governor housing so that
(e) Remove the three screws and
the fuel rod enters the slot in the terminal lever cross pin,
lockwashers from cover, and lift cover and gasket off the
and the fuel rod collar rests in the front side of the
subcover. Remove the two capscrews and lockwashers
terminal lever cross pin with the flat side of the collar
from the subcover at the cylinder head. Remove two
adjacent to the side of the terminal lever.
screws securing subcover to the governor housing.
(h) Install the two subcover to governor
(f) Lift up on the subcover until a definite
housing screws and lockwashers. Tighten the screws
snap is heard to indicate that the fuel rod and collar have
securely.
been separated from the terminal lever cross pin. Then,
(i) Install the two lockwashers and
remove the subcover assembly, pulling the fuel rod out of
capscrews through the flange of subcover, gasket, throttle
the hole in the cylinder head and throttle control rod
control rod mounting bracket, and gasket, then thread
mounting bracket.
them into the cylinder head. Tighten the capscrews to a
(g) Remove the four capscrews and
torque of between 7-9 ft. lb. Then, (step (a) and/or (b)
lockwashers securing governor to the governor drive, then
above) tighten the governor drive housing capscrews to a
lift governor off the drive housing. Remove the gasket.
torque of between 13-17 ft lb.
NOTE
(j) If removed, install the oil supply line
If the engine is being disassembled for
elbow in governor housing, then reconnect the oil inlet
overhaul, remove the governor drive
line to the elbow.
from blower housing.
(k) Install the retracting spring on speed
(h) Remove
six
capscrews
and
adjusting shaft with the hooked end of spring facing out.
lockwashers from governor drive, then lift governor drive
Install the control lever on the speed adjusting shaft, then
and gasket from blower housing.
install capscrew, lockwasher and nut. Tighten the nut to
(2) Installation. When the governor drive has
7-9 ft. lb. torque.
been removed, proceed as follows:
(l) Install throttle control arm (fig. 5-5)
(a) Position a new gasket on blower
over end of control lever, then install the link pin and the
housing, hold governor drive-in place and install six
cotterpin.
lockwashers and screws. Do not tighten screws at this
(m) Place the straight end of the
time.
retracting spring on top of the boss at side of the governor
NOTE
housing, then hook the opposite end of the spring over the
If governor drive was not removed, skip
control lever.
(a) above and proceed as follows:
(n) Connect the fuel rod to the injector
(b) Loosen the six governor drive
control tube lever with pin and cotter pin.
mounting capscrews until there is a little movement
(o) Pour approximately one pint of
available to the housing.
engine oil in the top of the governor to provide initial
(c) Position a new gasket on top of the
governor lubrication.
governor drive housing.
(p) Install a new gasket on top of the
(d) Position the governor over the drive
governor subcover, then install cover on top of the gasket
housing with the maximum speed adjusting screw toward
and secure with three lockwashers and screws. Tighten
the cylinder head. Turn the ball head assembly slightly to
the screws securely.
align splines of shaft with splines of the driven shaft
(q) Position the control racks and make
sleeve; then, place the governor shaft straight into the
final adjustments as outlined under "adjustment".
sleeve and position governor on the gasket and drive
h. Fuel Pump. The fuel pump is mounted on the
housing.
blower just below the blower drive shaft.
(e) Install the four governor to drive
(1) Removal.
housing lockwashers and capscrews.
Tighten the
(a) Disconnect the fuel lines from the
capscrews to a torque of between 13-17 ft. lbs.
pump.
5-7
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