Cooling System, General - Volvo Penta D7A T Operator's Manual

Maintenance: Cooling system general

Cooling system, general

The freshwater system is the internal cooling system of the engine. It is a closed system and shall always be fil-
led with coolant that protects the engine from internal corrosion and frost damage if the climate requires it. Anti-
corrosive additives become less efficient with age and the coolant must therefore be changed in accordance with
the recommendations in the maintenance schedule.
The rawwater system is the engine's external cooling system and it is either a seawater system or a central coo-
ling system. It cools the internal cooling system in an engine mounted or externally mounted heat exchanger.
The Volvo Penta Genset comes with an internal freshwater system connected to an engine mounted heat exchan-
ger, a radiator cooler, or prepared for external cooling, e.g. keel cooling or central cooling.
WARNING! Never open the pressure cap or drain the cooling system when the engine is warm. Steam or
hot fluid may spurt out.
WARNING! The coolant is dangerous to your health and an environmental hazard. Handle coolant with
care and dispose of old coolant in accordance with local regulations.
IMPORTANT! For coolant specification, refer to section "technical data".
IMPORTANT! Check the coolant level on a cold stationary engine.
IMPORTANT! Coolant to be added should have the same concentration as the coolant in the engine. Do
not add plain water.
IMPORTANT! Certain parts of the system are made of light alloy. Chemical additives must therefore not
be used when cleaning the system.
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