Daewoo ST Series Instruções de Operação descarregar pdf (Página 29)

2) Quantity of anti-freeze

The anti-freeze, 35 ~ 40% of the whole coolant, is always to be used to prevent the cooling

system from the corrosion. And in winter the amount of anti-freeze shown in the following

table should be used in accordance with the ambient temperature.

As the individual freezing points corresponding to the proportions of antifreeze in the table

are subject to change slightly according to the kind of antifreeze, you must follow the

specifications provided by the antifreeze manufacturer.

Any coolant loss due to engine operation must be replenished. But adding fresh water for

coolant tends to lower the content of anti-freeze. Always replenish the coolant with a

mixture of antifreeze and water, and keep the proper content of antifreeze (35 ~ 40%)

4.3.3. Heat exchanger and water cooling line cleaning

(1) Heat exchanger cleaning

If the heat exchanger tubes are clogged by small pieces or polluted by corrosion, the volume

of supplied sea water will be reduced gradually. This would be cause of engine overheating.

•

Disassemble both left and right side covers of the heat exchanger.

•

Remove the clogged small pieces and clean the heat-exchanger tubes.

When the heat-exchanger tubes do cleaning, clean outside and inner side of tubes by using

a small wire brush and pressurized water.

(2) Fresh water cooling line cleaning

If the cooling circuits are fouled with water scales or sludge particles, the cooling efficiency will

be lowered.

The poor condition of the cooling system might be normally due to use of unsuitable anti-

freezing agents so periodically clean the circuit interior with a cleaner.

Cooling system cleaning interval : Every 1,200 hours

- 26 -

Ambient

Temperature (˚C)

Cooling water (%)

Anti-freeze (%)

Over -10

-10

-15

-20

-25

-30

-40

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Daewoo ST Series Instruções de Operação Página 29