49
Freshwater system
The freshwater system is the engine's internal cooling system. It is a closed system and must always be filled
with a coolant that protects it against internal corrosion and freezing when the climate demands.
The circulation pump ensures sufficient circulation in the system. The thermostat will start to open at a certain
temperature and will be fully open when the engine has attained normal operating temperature. When the thermo-
stat opens, the warm coolant passes through the heat exchanger where it is cooled by the water in the engine’s
seawater system.
Coolant. Checking the level
WARNING!
Do not open the engine coolant sys-
tem filler cap when the engine is still hot except
in an emergency. Steam or hot coolant may
spray out.
Turn the filler cap to the first stop and let any pressure
escape from the system before removing the cap. Top
up coolant if necessary. The coolant level should be
between the MAX and MIN marking on the expansion
tank when the engine is at normal operating tempera-
ture. The level is normally lower when the engine is
cold. Reinstall the filler cap.
Coolant. General
The freshwater system must be filled with a coolant
that protects the engine against internal corrosion and
from freezing (if the climate requires it).
Never use
freshwater alone.
WARNING!
Anti-corrosive agents and antifreeze
products are harmful to health (do not drink!)
If there is a risk for freezing at any time of year, the
engine coolant system must be filled with a mixture of
50% Volvo Penta antifreeze and 50% clean water (as
neutral pH as possible). This mixture prevents corrosi-
on and protects against freezing down to approx. –
40°C. It should be used all year round.
NOTE! There
should be at least 40% antifreeze in the system for
complete protection against corrosion.
Where there is
no
risk of damage from freezing the
engine coolant can be fresh water with of Volvo Penta
anti-corrosion fluid added. Mix according to the ins-
tructionson the packaging.
IMPORTANT!
Never mix antifreeze (glycol) and
anti-corrosive agents. The two combined can
produce foam and drastically reduce the
coolant’s effectiveness.
Summary of Contents for KAD/KAMD300
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