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Chapter 5. COOLING SYSTEM MAINTENANCE
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TM-10-3930-673-34 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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Section II. COOLING SYSTEM MAINTENANCE PROCEDURES
TM 10-3930-673-34
Section I.
DESCRIPTION AND DATA
This chapter covers maintenance procedures for the engine cooling system components, as well as principles
of operation.
5-2. PRINCIPLES OF OPERATION
a. System Operation. Coolant liquid is circulated through passages in engine cylinder block and through
the engine oil cooler by an engine-driven water pump. The water pump also serves to force coolant to flow
through the radiator, from top to bottom, as long as thermostat is open to allow flow to radiator. As coolant
flows downward in radiator, airflow produced by the engine fan is forced through the radiator. Heat is
removed from the coolant in this way.
b. Water Pump. The water pump is a centrifugal-type unit that is driven by belt off the crankshaft pulley.
c. Thermostat. The thermostat is a heat-operated valve which serves to regulate coolant temperature
within a range that provides the most efficient engine operation. The thermostat is a modulating type, which
begins to open at a coolant temperature of 180F (82C) and is fully open when coolant temperature reaches
190F (88C).

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