TM 10-4320-344-24
2.21.41 Thermostat Maintenance, Model 609-A. (Continued)
Allow engine to cool before removing thermostat to avoid being burned by hot
engine.
Failure to obey this warning may result in serious personal injury.
a .
Loosen hose clamp (Figure 2-156,
1) and disconnect water return hose (2) from
thermostat housing (3).
b .
Remove four bolts (4), lock washers (5), water outlet (3), and gasket (6).
Discard lock washers (5) and gasket (6).
c .
Remove thermostat (7).
2.21.41.2 Repair.
Do not use cleaning solvent without proper ventilation and clothing.
Do not
smoke or use near open flame or excessive heat.
Dry cleaning solvent is
potentially dangerous to personnel and property.
Clean parts in a well-
ventilated area.
Avoid inhalation of solvent fumes.
Wear goggles and rubber
gloves to protect eyes and skin.
Wash exposed skin thoroughly.
Failure to
obey this warning may result in personal injury or death.
a .
Clean all gasket (6) mounting surfaces with rag dampened in cleaning solvent.
b .
Inspect all
c .
Replace all
2.21.41.3 Testing.
components and mounting hardware for damage.
defective components.
Ensure thermostat is not resting on bottom of container.
a.
Place thermostat (7) in boiling water.
b.
Thermostat (7) should fully open.
c .
If thermostat (7) does not fully open, replace it.
2.21.41.4 Installation.
Place cone shaped end of thermostat away from cylinder head assembly.
Failure to do so will result in damage to equipment.
a .
Install thermostat (7) in cylinder head (9).
b .
Position new gasket (6) and water outlet (3) on cylinder head (9) and secure
with four new lock washers (5) and bolts (4).
Torque bolts (4) to 15 ft-lbs
(20 N•m).
c .
Slide water return hose (2) on water outlet (3) and secure with hose
clamp (1).
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