Hanse 370 - 1.7.4. Cooling system; Explains the two-circuit cooling system, heat exchanger, and seawater filter.

To Next Page

To Previous Page

H A N S E 3 7 0

Alarm systems

The alarm is set off if the cooling water temperature is exceeded or the oil pressure is too low. The

oil pressure switch triggers the alarm when the engine’s ignition is switched on but the engine is

not yet running.

Note: If the alarm is heard during the operation of the machine, the

engine should be switched off immediately and the reason for the

fault investigated.

Note: The engine should be warmed up slowly and not accelerated to

full speed if the operating temperature has not yet been reached.

1.7.4. Cooling system

The engine is equipped with a two-circuit cooling system.

The internal system is a closed circuit. In case of frost, an antifreeze agent must be added to the

internal circuit. The temperature is controlled by a thermostat. During winter storage, the cooling

water needn’t be drained off if it is mixed with an antifreeze agent suited for the existing

temperatures below freezing.

The external circulation draws seawater through the seacock in the front part of the engine room.

The cooling water is transported in the heat exchanger and then sprayed into the exhaust system in

the exhaust manifold. The exhaust is thus cooled and the sound absorbed. The exhaust is

discharged at the stern.

The heat exchanger serves to cool the engine oil, the cooling water of the primary circulation and

the hydraulic oil of the gears. The heat exchanger is provided with a zinc anode to avoid

electrolytic corrosion.

The seawater filter must be cleansed on a regular basis.

Attention

Check the seawater filter on a regular basis. Depending on the water

quality, cleansing may be necessary.

Attention

After starting the engine, check whether water is discharged from the

exhaust, also intermittently, in addition to the exhaust gas.

In addition, the cooling water supply must be checked and ensured.

Before starting the engine:

 make sure that the cooling water inlet is open,

 make sure that the engine room is ventilated,

 take a look into the engine room to check for possible leaks,

 keep the engine room hatch closed (danger posed by loose objects).