ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
4-43
COOLANT 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 the
bottom or sides of the container.
Suspend a reliable thermometer so that its temperature sensing end is immersed but not touching
the bottom or sides of the container.
Do not overheat as damage to thermostat may result. Equipment damage
could 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 begin
opening 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)
4-66
Install gasket (9), spacer (8), gasket (7), thermostat (6), thermostat housing (5), lockwashers (4), and
screws (3).
Install radiator hose clamp (1) on radiator hose (2), and install radiator hose (2) on thermostat
housing (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).
