TM 10-4320-307-24
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THERMOSTAT HOUSING ASSEMBLY REPAIR/REPLACE. (CONT) .
5.
Remove thermostat and housing as follows:
a.
Remove four capscrews and lockwashers (14) and remove thermostat housing (9) from water manifold (15).
b.
Remove thermostat seal (16), thermostat (17), and thermostat gasket (18
CLEANING/INSPECTION/REPAIR:
Dry cleaning solvent is potentially dangerous. Avoid repeated and prolonged breathing of vapors and skin
contact with the liquid. Do not use near open flame, arcing equipment, or other ignition source. Always wear
eye protection and protective clothing.
1.
Use wire brush and/or dry cleaning solvent to clean the thermostat housing. Inspect for breaks, cracks, and
excessive corrosion. Repair is limited to the replacement of faulty items.
2.
Inspect drain cock for proper opening and closing. Replace if defective.
3.
Check operation of thermostat as follows:
a.
Check body of thermostat to find at what temperature thermostat is in open position.
b.
Put thermostat and a thermometer into container of water. Use a device to hold the thermostat and thermometer
so that they will not touch container.
c.
Heat water. Thermostat must begin to open when temperature of water is at the same temperature marked on
the body of the thermostat.
d.
Continue to heat water until temperature is 15 to 20F (8.3 to 11.1 °C) more than the value marked on the
thermostat. At this temperature, thermostat must be fully opened. The thermostat is fully opened when there is
at least a 0.375 inch (9.5 mm) space between seal sleeve and brass part of thermostat.
e.
Replace thermostat if it does not operate in correct temperature range.
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