Thermostat - HYOSUNG MS3 250 Sercie Manual

6-9 COOLING SYSTEM

THERMOSTAT

◉ ◉ REMOVAL
● Lift and support the side cover with the side cover
stay. (Refer to page 2-2)
● Drain engine coolant. (Refer to page 2-16)
● Place a rag under the thermostat case.
● Remove the thermostat case cap.
● Remove the thermostat ① .
◉ ◉ INSPECTION
Inspect the thermostat pellet for signs of cracking.
Test the thermostat at the bench for control action, in
the follwing manner.
● Pass a string between flange, as shown in the
photograph.
● Immerse the thermostat in the WATER contained
in a beaker, as shown in the illustration.
Note that the immersed thermostat is in suspen-
sion.
Heat the water by placing the beaker on a stove
②
and observe the rising temperature on a ther-
mometer ③ .
● Read the thermometer just when opening the ther-
mostat.
This reading, which is the temperature level at
which the thermostat valve begins to open, should
be within the standard value.
Thermostat valve
operation temperature
Valve opening
Valve full open
Valve closing
Standard
76 ℃ (169 ℉ )
90 ℃ (194 ℉ )
71 ℃ (160 ℉ )
①
②
③
Water