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COOLANT SYSTEM COMPONENTS
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Fig.  2  Coolant System Reservoir Installation
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 COOLING SYSTEM general terms. A.  RADIATOR This  component  is  one  of  the  most  important  as  this  is where   most   of   the   heat   of   the   system   is   dissipated.      The radiator is made up -of the following parts: 1. Top and Bottom Tank-look for leaks, particularly where tank is soldered to core.  Vibration and pulsation from pressure can fatigue soldered seams. 2. Filler Neck-the sealing seat must be smooth and clean. Cams on filler neck must not be bent or worn so as to allow  loose  fitting  cap.    Ensure  overflow  tube  is  not plugged. 3. Tubes-because these are very small, they can become clogged, or partially so, by rust and scale.  The general condition     of     the     cooling     system     and     operating temperature are indications as to the cleanliness of the tubes.    Another  good  test  is  to  feel  the  core  for  cold spots. 4. Fins-these  thin  metal  sheets  radiate  or  pass  off  the heat picked up by the tubes..  They should be kept free of  bugs,  leaves,  straw  and  other  interference  to  allow free  passage  of  air.  Bent  fins  should  be  straightened for maximum heat dissipation. 5. Radiator  Cap-(Pressure-Sealing  Type).  Its  purpose  is to  hold  the  cooling  system  under  a  slight  pressure, increasing the boiling point of the cooling solution and preventing loss of the solution due to evaporation and overflow. The cap (Fig.  1) has a spring-loaded valve, the seat of which is below the overflow pipe in the filler neck.  This prevents the escape of air or liquid while the cap is in position.  When the cooling system pressure reaches a predetermined   point,   the   cap   valve   opens   and   will again    close    when    the    pressure    drops    below    the predetermined point. When    removing    the    pressure    type    cap    from    the radiator,  perform  the  operation  in  two  steps.    Loosen the  cap  to  its  first  notch  to  raise  the  valve  from  the gasket  and  release  the  pressure  through  the  overflow pipe.  In the first stage position of the cap it should be possible   to   depress   the   cap   approximately   3   mm (1/8").  The depression can be adjusted Fig.  1  Radiator Cap (Pressure Type) by  bending  the  prongs  on  the  cap.  Care  should  be taken  when  bending  the  prongs  to  ensure  the  cap  is not   too   loose   as   this   would   prevent   proper   sealing. Then slowly continue to turn cap counterclockwise until you can remove it. NOTE: When removing the cap, loosen it slowly and then pause to allow the pressure to bleed.  This will avoid possible burning by hot water or steam. 6. Reservoir    System-(if    so    equipped).    The    reservoir installation    consists    of    a    simple,    plastic    reservoir mounted  near  the  radiator  cap,  coolant  lines  and  a special radiator cap (Fig.  2).  Once the radiator cap is installed,  it  should  not  be  removed  except  when  the cooling  system  is  cold  and  for  refilling  after  the  entire system is drained.  With this system, coolant make-up originates   from   the   reservoir.      Coolant   overflowing from  the  radiator  enters  the  reservoir  to  be  conserved until  drawn  back  into  the  cooling  system  (engine  and radiator) when it cools down.  The reservoir installation provides  a  means  of  removing  air  from  the  cooling system and keeping the coolant level at a maximum fill condition. The  following  illustrations  explain  the  operation  of  this system under conditions that exist in the cooling system. Fig.  3:  Initial condition of the system.  The reservoir is filled to the "FULL" line.  The radiator has been filled to the filler neck.  Engine  has  started  and  as  system  begins  to  warm  up, expanding   air   in   the   system   is   expelled   through   the   open vacuum   valve   and   out   the   radiator   overflow   tube   into   the reservoir where it escapes at the reservoir overflow outlet. CTS-2019P  Page 5 PRINTED IN UNITED STATES OF AMERICA

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