Daewoo ST Series Betriebsanleitung PDF herunterladen (Seite 31)

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Inspection

(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.

•

Thermostat replacement

(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 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.

If the thermostat is detected defective, replace with a new one.

Check the thermostat and clean or exchange for excessive corrosion every 1 year.

4.3.6. Impeller of sea water pump check

The sea water pump is a rubber impeller type driven by gear. Every time the engine starts you

should always check whether the kingston valve on the bottom of boat is opened or not.

If the engine is run in a dry impeller condition for more than 20 seconds, the rubber impeller

is burned and cracked by high revolution of sea water pump.

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EFM2055I

Bar

Thermometer

Wood plate

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Daewoo ST Series Betriebsanleitung Seite 31