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 TM 55-1905-219-14-6
3-153. THERMOSTAT AND HOUSING - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
TESTING
9.
Thermostat
a. Check for accumulation
of rust and corrosion
from the engine cool-
ant. If present, it
can restrict the flow
of water, causing
engine overheating.
b. Thermostat stuck in
Allows incom-
wide open position
plete combust-
will not allow
ion of fuel
engine to reach
and build-up
normal operating
of carbon
temperature.
deposit on
pistons, rings
and valves.
c. Check thermostat
operation by
immersing it
in a container
of hot water.
1. Place thermometer
in the container.
Do not let it touch
the bottom of the
container.
2. Agitate water to
maintain an even
temperature.
3. As the water is
Water tempera-
heated, the ther-
ture at 170
F
mostat should
(76.7 C).
begin to open.
4. Thermostat should
Few types fully
be fully open by
open at 195
F
185 F (85 C).
(90.6 ).
C
3-2624
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