DL06K Interim Tire-4 Diesel Engine Maintenance of Major Components
176
z 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 75 °C and 9.5 mm or more
(opening wide) at temperature of
90
°C, the thermostat is normal.
z 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.
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