TM 5-3810-300-24&P-3
5
SECTION 5
COOLING SYSTEM
CONTENTS
Cooling System ....................................................................................................................................
Fresh Water Pump ...............................................................................................................................
Water Manifold .....................................................................................................................................
Thermostat ...........................................................................................................................................
Radiator ................................................................................................................................................
Engine Cooling Fan ..............................................................................................................................
Water Filter and Conditioner ................................................................................................................
Specifications-Service Tools ................................................................................................................
COOLING SYSTEM
To effectively dissipate the heat generated by the engine
a radiator and cooling fan are provided to protect the
engine and prevent severe damage. A centrifugal type
water pump, attached to and driven by the blower,
circulates the engine coolant through the lubricating oil
cooler, cylinder block, cylinder head, and water manifold.
A thermostat is utilized to maintain a normal engine
operating temperature range of 1600F. to 185F.
The engine coolant is circulated through the radiator
(Fig. 1) where the heat is absorbed in the air stream
developed by either a blower or suction fan which is belt
driven from the crankshaft. The water pump draws the
coolant through the oil cooler and discharges it into the
lower part of the cylinder block. Openings in the water
jacket around the cylinder bores connect with
corresponding openings in the cylinder head through
which the liquid rises to circulate around the valves and
Engine Cooling System Maintenance
fuel injectors. Then the coolant passes through a water
manifold, bolted to the cylinder head, past the thermostat
A properly maintained and clean cooling system will
and into the radiator.
reduce engine wear and increase the satisfactory engine
operating time between engine overhauls.
This is
upon starting a cold engine or when the coolant is below
accomplished by the elimination of hot spots within the
operating temperature (thermostat closed) the coolant is
engine. Thus, when operating within the proper engine
by-passed from the water manifold directly to the pump,
temperature range and when not exceeding the
thus providing water circulation within the engine during
recommended horsepower output of the unit, all engine
the warm-up period.
parts will be within their operating temperature ranges
and at their proper operating clearances.
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