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Remove the cover of the thermostat (1).
Remove the thermostat (2).
Checking thermostat valve
Check to see if the thermostat pad is damaged.
Check the functioning of the thermostat as follows:
• Suspend the thermostat by a piece of string threa-
ded through the flange as indicated in the figure.
• Immerse the thermostat in water contained in a labo-
ratory glass as indicated in the figure. Ensure that
the thermostat is maintained in suspension. Heat the
water with a heat source and observe the increase
in temperature of the thermometer.
• Observe the temperature at the moment of opening
of the thermostat. The temperature at which the
thermostat commences to open should be between
the indicated values.
Standard
Thermostat opening temperature:
74.5 - 78.5°C
• Continue to heat the water to increase the tempera-
ture.
• When the temperature of the water reaches the spe-
cified value, the thermostat should be raised up by
at least 7 mm.
Standard
Raising up of the thermostat:
More than 7.0 mm at 90°C
• If the thermostat does not satisfy only one of the
requisites (opening temperature and raising up of
the thermostat), it must be substituted.
Cooling system and lubrication system
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