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ELECTRICAL ALTERNATOR - TM-5-4210-230-14P-1_437
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 COOLING SYSTEM Fig.  10  SE-2395 Antifreeze and Battery Tester TROUBLE SHOOTING A.  CAUSES OF COOLANT LOSS: 1. Leaks and seepage-may be either external or internal. External   leaks   easy   to   locate,   may   occur   at   radiator, heater, water pump, core plug hole, hose connections, radiator cap, drain cocks and gaskets. Internal   leaks   are   more   difficult   to   locate   since   these leaks  occur  at  cracks  and  faulty  head  gaskets.    Internal  leaks are indicated by a decrease in coolant level and the presence of coolant  in  crankcase.    Correct  this  condition  immediately  or serious damage to engine will result. 2. Boiling-may be caused by any of the following: a. Radiator    or    other    parts    of    cooling    system clogged with rust or scale. b. Grille or.  bug screen clogged. c. Radiator core fins damaged. d. Thermostat defective-stuck closed. e. Water pump leaking air into system. f.  Radiator hose collapsed or rotting inwardly. g. Radiator pressure cap defective. h. Cylinder     head     loose     causing     exhaust     gas leakage into cooling system. i. Water   pump   impeller   corroded   or   loose   on shaft. j. Antifreeze protection inadequate causing partial freeze-up. 3. After-Boil-Boiling which may occur in a cooling system after the engine is -shut off even though it did not occur during operation is known as after-boil.  This condition which  usually  happens  to  cooling  systems  that  need attention, occurs because the coolant is still picking up heat    from    the    engine    and    the    heat    is    not    being dispersed  by  circulation  through  the  radiator.    Other causes of after-boil are over-protection or use of high- temperature   thermostat   with   alcohol   type   antifreeze, improper installation of the thermostat, or a thermostat that is operating improperly. 4. Foaming-Foaming  of  coolant  may  also  cause  coolant loss.  This occurs only with a very dirty cooling system and  under  severe  operating  conditions.  Usually  an  air or  exhaust  leak  in  the  system  contributes  to  foaming and  this  is  caused  by  a  faulty  gasket,  leaky  radiator hose   or   water   pump   seal.      Foam   is   an   excellent insulator    and    can    seriously    interfere    with    proper circulation. 5. Evaporation-Evaporation reduces the amount of coolant  in  the  system.    This  is  a  common  occurrence where  alcohol  base  types  of  antifreeze  are  used.    A faulty    pressure    cap    may    also    be    the    cause    of evaporation. B.  CAUSE OF OVERHEATING 1. Cooling System a. Low coolant supply. b. Leaks   at   any   of   the   following:   gaskets,   hose connections, water pump, radiator, heater, core plugs,   drain   cock   or   plugs,   cracked   head   or block. c. Broken or loose fan belt. d. Radiator clogged. e. Collapsed or clogged hose. f. Defective pressure cap. g. Worn or corroded impeller on water pump. h. Foaming. i. Radiator air flow obstructed. j. Bent fan blade. k. Improper or defective thermostat. 2. Ignition System a. Ignition timing late. b. Defective spark advance. 3. Fuel System a. Carburetor set too lean. b. Valves timed late or leaking. c. Intake manifold leaking. d. Leak in vacuum operated accessories. 4. Miscellaneous a. Clogged muffler or tail pipe. b. Stiff re-built engine. c. Dragging brakes. d. Low engine oil level. e. Engine overloaded. Cause of Overcooling: 1. Missing thermostat. 2. Defective thermostat stuck open. 3. Short runs and intermittent driving. CTS-2019P  Page 11 PRINTED IN UNITED STATES OF AMERICA

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