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 TM 55-1905-219-14-5
3-78. THERMOSTAT AND HOUSING - MAINTENANCE INSTRUCTION (Cont).
LOCATION
ITEM
ACTION
REMARKS
TESTING
9.
Thermostat
a. Check for accumulation
(15)
of rust and corrosion
from the engine cool-
ant, if present, can
restrict the flow of
water causing engine
overheating.
b. Thermostat (15) stuck
Allows incom-
in wide open position
plete combus-
will not allow engine
tion of fuel
to reach normal opera-
and build-up
ting temperature.
of carbon
deposit on
pistons, rings
and valves.
c. Check thermostat (15)
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 (15) should
(76.7 ).
C
begin to open.
4. Thermostat (15)
Few types fully
should be fully
open at 195
F
open by 185
F
(90.6 ).
C
(85 ).
C
3-1380
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