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AIR CLEANERS CONTENTS
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Fig.  3  Typical Dry Type Air Cleaner
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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