ARMY TM 9-6115-464-12AIR FORCE TO 35C2-3-445-1NAVY NAVFAC P-8-624-124-43COOLANT THERMOSTAT AND HOUSING.a.Removal.(1) Remove left side fan guard (paragraph 4-38a (1)).(2) Refer to paragraph 3-27 and drain the radiator.(3) Refer to paragraph 4-20 and remove the coolant temperature transmitter.(4) Loosen clamp (1, Figure 4-26) and remove radiator hose (2).(5) Remove screws (3) and lockwashers (4) to remove thermostat housing (5), thermostat (6), gasket (7),spacer (8), and gasket (9).b. Cleaning and Inspection.(1) Clean thermostat and housing with an approved solvent.(2) Inspect thermostat for cracks, corrosion, accumulations of scale or rust, and other damage.(3) Inspect housing for cracks, corrosion, and other damage.c.Testing.(1)(2)(3)(4)(5)Suspend thermostat in a container of water so that it is completely immersed but not touching thebottom or sides of the container.Suspend a reliable thermometer so that its temperature sensing end is immersed but not touchingthe bottom or sides of the container.Do not overheat as damage to thermostat may result. Equipment damagecould result if caution is not observed.Gradually heat the water while stirring to evenly distribute the heat.Observe the thermometer and the thermostat. If the thermostat is operating properly, it should beginopening when the water temperature reaches 177°F (80.6°C) and be fully open at 205°F (96.1°C).Replace the thermostat if it fails to function properly.d. Installation.(1)(2)(3)(4)(5)4-66Install gasket (9), spacer (8), gasket (7), thermostat (6), thermostat housing (5), lockwashers (4), andscrews (3).Install radiator hose clamp (1) on radiator hose (2), and install radiator hose (2) on thermostathousing (5) and tighten radiator base clamps (1).Refer to paragraph 4-20 and install coolant temperature trantsmitter.Refer to paragraph 3-27 and fill the radiator.Install left side fan guard (paragraph 4-38a).
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