Doosan AD158TI, Руководство по эксплуатации и техническому обслуживанию

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General information - 36 -
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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.
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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 tem-
perature 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 starting off.
(2) When draining out or replenishing coolant, do it slowly so that air is bled sufficiently from the entire
cooling system.
(3) Replacing thermostat
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If the thermostat is detected defective, replace with a new one.
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Change the thermostat every 2 years.
4.3.7. Sea water pump
As the sea water pump is a bronze impeller type driven by V-belt, should install the sea water strainer
between sea water pump and kingston valve to prevent malfunction of impeller due to clogging by any mat-
ters sucked.
Every the engine starts you should always check whether the kingston valve on the bottom of the boat is
opened. If sea water does not flowed out through outlet pipe of the boat outside, fill coolant in the sea water
pump inlet pipe and hose after loosening clamp.
EFM2055I
Thermometer
Wood plate
Bar