5-10 COOLING AND LUBRICATION SYSTEM
INSPECTION
Inspect the thermostat pellet for signs of cracking.
Test the thermostat at the bench for control action, in the follow-
ing manner.
• Pass a string between flange, as shown in the illustration.
• Immerse the thermostat in the water contained in a beaker, as
shown in the illustration. Note that the immersed thermostat is
in suspension. Heat the water by placing the beaker on a stove
and observe the rising temperature on a thermometer.
• Keep on heating the water to raise its temperature.
• Just when the water temperature reaches specified value, the
thermostat valve should have lifted by at least 8.0 mm (0.31 in).
 Thermostat valve lift
Standard: Over 8.0 mm at 95°C (Over 0.31 in at 203°F)
• A thermostat failing to satisfy either of the two requirements
(start-to-open temperature and valve lift) must be replaced.
1 Thermostat 2 String
3 Stove 4 Thermometer
• Read the thermometer just when opening the thermostat. This
reading, which is the temperature level at which the thermostat
valve begins to open, should be within the standard value.
 Thermostat valve opening temperature
Standard: Approx. 82°C (180°F)
INSTALLATION
• Install the thermostat.
NOTE:
The jiggle valve
A
of the thermostat faces upside.
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