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7·10
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
CD
between flange of thermostat
(2),
as shown.
• 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 thermome-
ter@.
• Read the thermometer just when opening the thermostat. This
reading, which is the temperature level at which the thermo-
stat valve begins to open, should satisfy the standard value.
_ Thermostat valve opening temperature
Standard: Approx.
82°C
(180
OF)
• 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: 8.0 mm and over at
95°C
(0.31 in and over at 203
OF)
• A thermostat failing to satisfy either of the two requirements
(start-to-open temperature and valve lift) must be replaced.
INSTALLATION
• Install the thermostat.
NOTE:
The jiggle valve ®
of
the thermostat faces upside.