DV11
Operation and Maintenance
182
Maintenance of Major Components
Printed in Mar. 2005 PS-MMA0608-E1A
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 83 °C and 8 mm
or more (opening wide) at
temperature of 95°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 overspeed 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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