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EFFECTS OF COOLING SYSTEM NEGLECT
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Hydrometers
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 COOLING SYSTEM Avoid spilling solution on vehicle paint. 4. Replace radiator cap (if so equipped) and run engine at moderate speed, covering radiator if necessary, so the radiator  reaches  a  temperature  of  84  degs.    C  (180 degs.  F) or above but does not reach the boiling point. Allow the engine to run at least two hours at 84 degs C (180 degs.  F) so the cleaning solution will take effect. Do not drive vehicle or allow liquid level in radiator to drop low enough to interfere with circulation. NOTE:  Stop   engine   as   often   as   necessary   to   prevent boiling. 5. With  the  engine  stopped,  feel  the  radiator  with  bare hands  to  check  for  cold  spots,  and  then  observe  the temperature  reading.    Where  there  is  no  change  in temperature for some time, drain the cleaning solution. 6. If    clogging    of    the    core    is    relieved    but    not    fully corrected,  allow  the  engine  to  cool,  pressure-flush  the system  (See  Pressure  Flushing)  and  repeat  cleaning operation. 7. If clogging of core, indicated by low temperature spots on   the   core,   is   not   relieved;   radiator   core   must   be removed for mechanical cleaning. Mechanical cleaning  requires  removal  of  upper  and  lower  tanks and  rodding  out  the  accumulated  rust  and  scale  from the water passage of the core. D.  PRESSURE FLUSHING 1. Disconnect the upper radiator hose which connects the radiator  core  to  the  engine  water  outlet  and  -remove thermostat from engine water outlet. 2. Clamp a convenient length of hose to the radiator core outlet  opening  and  attach  another  suitable  length  of hose  to  the  radiator  inlet  opening  to  carry  away  the flushing stream. 3. Connect the flushing gun to compressed air and water pressure    and    clamp    the    gun    nozzle    to    the    hose attached to the radiator outlet opening. 4. With radiator cap (if so equipped) on tight, fill core with water.    Apply  air  pressure  in  short  blasts  to  prevent core damage. 5. Continue   filling   radiator   with   water   and   applying   air pressure   in   short   blasts   until   the   water   comes   out clear. 6. Clamp    the    flushing    gun    nozzle    firmly    to    a    hose attached  securely  to  the  engine  water  outlet  opening. Fill engine block with water, partly covering water inlet opening to permit complete filling. 7. Apply   compressed   air   to   blow   out   water   and   loose sediment.  Continue filling with water and blowing out with air until flushing stream comes out clear. 8. For  badly  clogged  engine  water  jackets  that  do  not respond  to  regular  pressure  flushing,  remove  engine cylinder head and core hole plugs and with a suitable length  of  snall  copper  tubing  attached  to  the  flushing gun    nozzle,    flush    the    water    jackets    through    the openings. 9. If  the  vehicle  is  equipped  with  a  heater  connected  to the cooling system, flush the heater following the same procedure as for the radiator core. 10. After  completing  the  flushing  operation,  clean  out  the radiator  overflow  pipe,  inspect  the  water  pump,  clean the thermostat and the radiator cap control valve (if so equipped).      Check   thermostat   for   proper   operation before installation. See "Thermostat". 11. Blow  insects  and  dirt  from  radiator  core  air  passages using water, if necessary, to soften obstructions. E.  TEST EQUIPMENT To aid the serviceman in maintaining the cooling system at top efficiency, various items of test equipment are available. Among these are the Cooling System Pressure Tester and the Hydrometer. 1. SE-1870 Cooling System Pressure Tester This equipment may be used in detecting the hard-to- find   leaks   in   the   cooling   system.      Any   leak   from cracked  or  warped  cylinder  heads  or  blown  gaskets (internal  or  external)  can  be  located  easily  and  in  a short   time   with   the   pressure   tester.      Adapters   are available  with  the  tester  which  permit  the  testing  of radiators  on  trucks  having  the  cabover-engine  design (Fig7).    Pressure  caps  can  also  be  tested  ,  with  the pressure tester.    CTS-2019P  Page 9 PRINTED IN UNITED STATES OF AMERICA

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