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 TM 55-1905-220-14-5
3-78. THERMOSTAT AND HOUSING - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
TESTING
9.
Thermostat
a. Check for accumulation
(15)
of rust and corrosion from
the engine coolant, 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
3-1362
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