Thermostat; Inspecting - Daewoo DE12T Manual

6.2.4. Thermostat

•
General descriptions and main data
The thermostat maintains a constant
temperature of coolant (90 ~ 95 °C)
and improves thermal efficiency of the
engine by preventing heat loss.
Namely, when the temperature of
coolant 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 pas-
sage to the radiator is opened so that
the coolant is forced to flow into the
radiator.
Item
Type
Open at
Open wide at
Valve lift
NOTE :
There are 2 kinds of thermostats according to surrounding and operating conditions.
One is named by 71 °C type and the other is 83 °C.
•

Inspecting

(1) Check the wax pallet and spring
for damage.
(2) Put the thermostat in a container
of water, then heat the water slow-
ly and check temperature with a
thermometer. If the valve lift is 0.1
mm (starting to open) at tempera-
ture of 83 °C and 8 mm or more
(opening wide) at temperature of
95 °C, the thermostat is normal.
MAINTENANCE OF MAJOR COMPONENTS
Specification
In moderate climates
Wax-pallet type
83 °C
95 °C
8 mm or more
- 154 -
To radiator
From cooling
To bypass
water pipe
tube
In tropical climates
Wax-pallet type
71 °C
85 °C
Truck : 8 mm or more
Ruler
측정자
Bypass
valve
EAMC002I
온도계
Thermometer
Woodplate
나무판
EFM2055I