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 TM 55-1905-219-14-1
e. The Coolant System is shown in Figure FO-17. Coolant is circulated through the engine by a centrifugal type
water pump. Heat is removed from the coolant which circulates in a closed system by a heat exchanger. Control of the
engine temperature is accomplished by thermostats. The thermostats regulate the flow of the coolant within the cooling
system.
f. Engine starting is provided by an Hydraulic Starting System. Engine speed is controlled by a mechanical,
variable speed Governor.
g. The Exhaust Manifold is shown in Figure 1-32. The water-cooled Exhaust Manifold is one piece and is cast
with an integral water jacket surrounding the exhaust chamber. The diameter of the exhaust chamber increases uniformly
from one end to the other where it ends in a flange to which an elbow and flexible exhaust connection is attached. A
portion of the engine coolant is by-passed from the rear of the cylinder block into the rear end of the jacket surrounding
the exhaust manifold. Then it is discharged from the forward end through a tube into the thermostat housing. A draincock
is installed in the bottom of the manifold for draining the water jacket. A plug is provided in the bottom of the exhaust
manifold elbow for draining moisture condensed from the exhaust gases.
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