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Engine Cooling Systems
Water Pump

Equipment Operator Basic - Beginning construction equipment operators manual
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these connections to prevent engine vibrations from being transferred to the radiator. When  performing  prestart  checks  on  the  radiator system, check for leaks, particularly where the tanks are soldered  to  the  core,  because  vibration  and  pulsation from pressure can cause fatigue of soldered joints or seams. Bent fins should be straightened and the radiator core checked for any obstructions, tending to restrict the air  flow.  Radiator  air  passages  can  be  cleaned  by blowing them out with an air hose in the direction opposite to the ordinary flow of air. Water can also be used to soften obstructions before applying the air blast. In any event, the cleaning gets rid of dirt, bugs, leaves, straw,  and  other  debris  that  would  otherwise  clog  the radiator and reduce its cooling efficiency. CAUTION Spraying high-pressure water to soften an obstruction on the radiator can cause damage to the fins and core. All  hoses  and  tubing  should  be  checked  for  leakage and  general  condition.  The  leakage  may  often  be corrected  by  tightening  or  replacing  the  hose  clamps. Figure  1-44.—Liquid-cooling  system. Deteriorated hoses should be replaced to preclude future troubles;  for  example,  hoses  sometimes  rot  on  the inside, allowing tiny fragments to flow through the system  and  become  lodged  in  the  radiator,  tending  to clog it and cause overheating. For this reason, all old, cracked, or spongy hose should be replaced as soon as the  condition  is  discovered  during  the  prestart  checks. RADIATOR PRESSURE CAP.— The radiator pressure cap (fig. 1-45) is used on nearly all modern Figure  1-45.—Radiator  pressure  cap. - - - - - 1-33







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