TM 5-4310-379-14
3-21. Thermostat and Housing Assembly.
This task covers:
a.
Test
b.
Replace
c.
Repair
INITIAL SETUP
Tools
Materials/Parts
General Mechanic's Tool Kit
Thermostat and Housing Assembly
(NSN 5180-00-177-7033)
Gasket
Thermometer (NSN 6685-00-373-3436)
Torque Wrench (NSN 5120-00-554-7292)
a.
Test.
NOTE
Thermostat removed for test. See para. c. below.
(1)
Place thermostat in container of heated water.
NOTE
Agitate water to maintain even temperature in container. Do not allow thermometer to touch
bottom of container.
(2)
Place thermometer in water to check temperature at which thermostat starts to open.
(3)
Thermostat should start to open at approximately 170°F (770 C).
(4)
Thermostat should be fully open at approximately 1920 F (890 C)
(5)
Replace a thermostat that does not perform to specification.
(6)
Install thermostat. See para. c. below.
b.
Replace. (figure 3-14)
(1) Open radiator cap (1) and pet cock (2) and drain coolant into suitable container and close pet cock (2).
(2)
Loosen clamp (3) and remove hose (4).
(3)
Loosen two fitting nuts (5) and remove by-pass line (6).
(4)
Remove fitting (7).
(5)
Remove three screws (8) and lockwashers (9), and remove thermostat and housing assembly (10) and
gasket(11 ).
(6) Ensure gasket surfaces are clean and old gasket material is removed.
(7) Install gasket (11) and thermostat and housing assembly (10) and secure with three screws (8) and
lockwashers
(9). Torque screws to 46-50 Ib-ft (62-68 Nm).
3-48
