MAINTENANCE OF MAJOR COMPONENTS
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4.1.3. Thermostat
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General descriptions and main dataThe
thermostat maintains a constant temperature of
coolant (90 ~ 95 °C) and improves thermal
efficiency of the engine by preventing heat loss.
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Namely, when the temperature of oolant is low,
the thermostat valve is closed to make the
coolant bypass to directly enter the water
pump; when the coolant temperature rises to
open wide the thermostat valve, the bypass
circuit is closed and the water passage to the
radiator is opened so that the coolant is forced
to flow into the radiator.
NOTE :
There are 2 kinds of thermostats according to surrounding and operating conditions.
One is named by 71 °ýC type and the other is 83 °C.
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Inspecting
(1) Check the wax pallet and spring for damage.
(2) Put the thermostat in a container of water, then
heat the water slowly and check temperature
with a thermometer. If the valve lift is 0.1 mm
(starting to open) at temperature of 83 °C and 8
mm or more (opening wide) at temperature of
EAMC002I
Item
Specification
In moderate climates In tropical climates
Type Wax - pallet type Wax - pallet type
Open at 83 °C 71 °C
Open wide at 95 °C 85 °C
Valve lift 8 mm or more Truck : 8 mm or more
EFM2055I
Woodplate
Thermometer
Ruler
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