TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
As the air enters the intake stack it passes through the filter
element, where impurities such as dirt and dust are removed.
From
there, it passes through the air to the manifold duct, which is
secured to the intake manifold and connected to the air filter
canister by the air duct hose. As the air passes through the air to
duct manifold, it passes the air restriction sensor.
The sensor is
connected to the air restriction gage which is located on the left
side of the instrument panel. The sensor senses the amount of dust
in the air as it leaves the air filter. If the air contains too much
dust, the indicator will read in the red zone. This means that the
filter element should either be replaced or, if replacement is not
possible, cleaned.
The gage is equipped with a reset button that
returns the float in the gage to its normal position.
The air then continues to travel through the air to the manifold duct
and the air duct hose, into the intake manifold, where it is directed
into each of the cylinders.
e.
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. During the burning of fuel, the temperature in the
combustion chamber is well above the melting point of iron.
Therefore, if nothing is done to cool the burning of fuel, the engine
during operation, valves will burn and warp, lubricating oil will
break down, and bearings and pistons will overheat, resulting in
engine seizure.
(1) Operation of the Engine Cooling System.
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.
8
Previous Page
