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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
FRAMES
GENERAL
Air must be clean if engine is to deliver proper
performance throughout its life span. Dirty air introduced into
the engine may ruin the carefully engineered close tolerance
of the engine.
Air cleaners are designed to supply clean air to the
engine; and if not kept clean, the supply of air will become
restricted. This will cause loss of power, sluggish
performance and poor gas mileage.
Four types of air cleaners are used on International
vehicles. They are the modulated dry type, dry type, oil bath
type and combination oil bath and dry type.
A description of the operation of each type is given in the
following paragraphs.
OPERATION
Due to the many variations in size and shape of air
cleaners used on International vehicles, no attempt has been
made to accurately illustrate all variations. Thus, all
illustrations herein are only typical of the type of air cleaner
being represented.
Modulated Dry Type Air Cleaner
The modulated dry type air cleaner (Fig. 1) provides a
thermostatically controlled damper connected to an exhaust
manifold stove to provide faster engine warm-up in any
weather.
Fig. 1 Typical Modulated Dry Type Air Cleaner (Air cleaner lid
and element removed for illustration purposes.)
The air temperature sensor mounted inside air cleaner
body and the vacuum chamber mounted on top of inlet tube
are factory calibrated units. Operation of the system is
completely automatic. The damper, operated by the sensor-
controlled vacuum chamber, regulates air entering carburetor
to 36-37° C (98-100° F) at all outside temperatures. Hot and
cold air conditions are thereby eliminated and better
carburetor calibration can be accomplished.
Dry Type Air Cleaner
Dry type air cleaners employ dry type elements sealed
within the air cleaner such that all air drawn into the engine
must pass through the air cleaner element.
The direction of air flow through the element of dry type
air cleaners illustrated in Figs. 2 and 3 is from the outside to
inside of filter element. This permits excess foreign particles
to fall free from outside surface of element prolonging element
service life.
The air cleaner in Fig. 3 is equipped with a vacuator
valve. Vacuator valves provide a means of escape for foreign
particles from the air cleaner without the necessity of air
cleaner disassembly.
Fig. 2 Typical Dry Type Air Cleaner
CTS-2056N Page 2
PRINTED IN UNITED STATES OF AMERICA
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