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Home > Ordnance Documents and other related manuals > > Cooling System - Od161570022
Air Induction System
Lubrication System - Od161570023

Introduction to the High Mobility Multi - Purpose Wheeled Vehicle (HMMWV)
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INTRODUCTION TO THE HMMWV - OD1615 - LESSON 1/TASK 2
The air then continues to travel through the air to manifold duct and the
air duct hose, into the intake manifold, where it is directed into each of
the cylinders.
5.
Cooling System
All internal combustion engines are equipped with some type of cooling
system because of the high temperatures they generate during operation.
High temperatures are necessary to generate the high gas pressures that act
on the head of the piston.
Power cannot be produced efficiently without
high temperatures.
However, it is not possible to use all the heat of
combustion without  harmful results.
The  temperature in  the  combustion
chamber during the burning of fuel is well above the melting point of iron.
Therefore, if nothing is done to cool the engine during operation, valves
will burn and  warp, lubricating oil will break down, and bearings and
pistons will overheat, resulting in engine seizure.
The  engine  cooling  system  is  a  pressure  type  cooling  system  with
thermostatic control of coolant circulation.  The cooling system dissipates
the  heat  generated  from  combustion  and  maintains  the  engine  operating
temperature at the most efficient range.
The cooling system on the HMMWV consists of the following components:
a
radiator, surge tank, thermostat, 10 blade fan and drive clutch, water pump,
radiator hoses, pulleys and drive belts, and the radiator shroud.
When the engine is cold, and the thermostat is closed, coolant is circulated
through the water pump and engine.  As the engine coolant reaches 190 F,
the thermostat opens, allowing coolant to flow through the radiator before
returning to the water pump and the engine.  Any air or vapor in the cooling
system will be forced to the surge tank under the liquid level and leave
through the vent tube.  As the system cools, the extra coolant in the tank
will be drawn back to the radiator.
The normal operating temperature is
between 190 to 230 F.
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