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 TM 55-1905-220-14-1
e. The Coolant System is shown in Figure FO-16. 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 a hydraulic starting system. Engine speed is controlled by a mechanical variable
speed governor.
g. The Exhaust Manifold is shown in Figure 1-34. 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 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.
Figure 1-34. Water-Cooled Exhaust Manifold Mounting
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