•
Inspecting
(1) Check the wax pallet and spring for
damage.
(2) Put the thermostat in a container of
water, then heat the water slowly and
check temperature with a thermometer.
If the valve lift is 0.1 mm (starting to
open) at temperature of 71 ˚C and 8 mm
or more (opening wide) at temperature
of 85 ˚C, the thermostat is normal.
•
Replacing thermostat and precautions
for handling
(1) Precautions for handling
The wax pallet type thermostat does not react as quickly as bellows type one to a variation
of temperature of coolant. Such relatively slow reaction is mainly due to the large heat
capacity of the wax pellet type thermostat. Therefore, to avoid a sharp rise of coolant
temperature, it is essential to idle the engine sufficiently before running it. In cold weather, do
not run the engine at overload or over-speed it immediately after engine starting.
(2) When draining out or replenishing coolant, do it slowly so that air is bled sufficiently from the
entire cooling system.
(3) Replacing thermostat
If the thermostat is detected defective, retrace with a new one.
- 114 -
EFM2055I
Thermometer
Wood plate
Bar
