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 TM 55-1905-223-24-5
(12) Remove nipple (14), temperature sending unit (16), and bolt and washer (13, 12) from housing
support (17).
(13) Remove water bypass tube (22) and preformed packing (23). Discard the preformed packing (23).
Clean and inspect the assembly as follows:
INSPECTION
a. Clean the gasket material from the sealing surfaces of the housing (19), support (17), and water outlet
connection (4).
b. Clean all parts with cleaning solvent.
c. Inspect all parts for cracks and other damage.
d. Inspect the inlet and outlet hoses (1, 9, 21) for deterioration. Replace if necessary.
e. If damage is discovered, replace the assembly.
f. Visually inspect the thermostat for cracks or corrosion.
g. Suspend the thermostat and a 212 (100 ) thermometer in a container of water. Do not allow the
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thermostat or the thermometer to touch the sides of the container.
h. Heat the water.
NOTES
Write down the temperatures at which the thermostat begins to open and when it is fully
open.
The nominal operating temperature is stamped on the thermostat.
The thermostat must begin to open between 178 (81 ) and 182 (83 ).
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The thermostat must be fully open to at least 9.5 mm (0.375 inch) by the time it reaches
202 (94 ).
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i. Replace the thermostat if it does not operate as described.
j. Visually inspect the thermostat seal for cracks or corrosion. Replace if necessary.
REPAIR
Repair to the thermostat housing is by replacing the water bypass hose (22), nonmetallic hose (21), gaskets (5,
6, 18), thermostat housing seal (7), thermostat flow control (8), and preformed packing (23).
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