ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-12SECTION XI. MAINTENANCE OF COOLING SYSTEM4-55. GENERAL. See Figure 1-12. Engine coolant is circulated through two filter assemblies and the engine by thewater pump. Hot coolant is returned to the radiator where it is cooled by a belt driven fan. A tensioned idler pulleyassembly maintains fan belt tension. Circulation of coolant Is regulated by the coolant thermostats. Radiator coolantlevel is checked using a sight gage, and cannot be monitored from the control compartment. A preheat system heats theengine coolant when the engine is not operating.4-56.REPLACE WATER PUMP. See Figure 1-6 and Figure 4-41. The water pump is a gear driven pump used tocirculate coolant throughout the engine and radiator.a. Remove.(1) Drain the radiator in accordance with paragraph 3-12. Store uncontaminated coolant for future use Drain coolant drain cock (26, Figure 4-41).(2)Remove preheat hose assembly in accordance with paragraph 4-63.(3)Remove hose assembly from radiator top tank in accordance with paragraph 4-57.(4)Remove hose (1) by removing hose clamps (2).(5)Remove the by-pass tube assembly (3) by removing capscrews (4) and lockwashers (5). Remove and discard gasket (6).(6)Remove water inlet connection (7) by removing capscrews (8) and lockwashers (9). Remove and discard tube gasket (10).(7)Remove water pump support (13) by removing capscrews (14 and 16), lockwashers (15), and plain washers(17).(8)Remove water pump inlet connection (11) and connection preformed packing (12).CAUTIONBack water pump directly off water pump drive support to avoid damage to splinedcouplings.(9)Remove capscrews (14) and lockwashers (15) from pump adapter plate (23). Leave plate on pump.(10) Remove water pump assembly (20) by removing capscrews (18) and lockwashers (19). Back water pump directly off drive support.(11)Remove water pump gasket (21), pump adapter gasket (24), pump adapter plate (23), preformed packing (22), and spline coupling (25).bInstall.(1)Install water pump gasket (21), pump adapter plate (23), preformed packing (22), pump adapter gasket (24),and spline coupling (25).(2)Install water pump assembly (20) with capscrews (18) and lockwashers (19).(3)Install capscrews (14) and lockwashers (15).(4)Install water pump support (3) capscrews (14 and 16), lockwashers (15), and plain washers (17).(5)Install the pump inlet connection (11) and preformed packing (12).(6)Install water inlet connection (7), gasket (10), secure with capscrews (8) and lockwashers (9).(7)Install by-pass tube assembly (3), tube gasket (6), capscrews (4) and lockwashers (5).4-115
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