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Cooling system
The cooling system is divided into a freshwater and a seawater system. The seawater pump sucks water into
the seawater system through the drive/reverse gear. The seawater is then pumped through the charge air
cooler oil cooler, heat exchanger and then into the exhaust elbow pipe where it is mixed with the exhaust gas-
es. The freshwater system is the internal engine coolant system. It is a closed system driven by the circula-
tion pump. The freshwater system engine coolant is cooled in the heat exchanger by the seawater.
WARNING! Risk for water penetration when working with the cooling system. Close the sea cock (does not
apply to drive).
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 anti-
freeze 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
corrosion and protects against freezing down to ap-
prox. –40°C. It should be used all year round.
NOTE! There should be at least 40% antifreeze in
the system for complete protection against cor-
rosion.
Where there is no risk of damage from freezing the
engine coolant can be fresh water with of Volvo Pen-
ta anti-corrosion fluid added. Mix according to the in-
structions on the packaging.
IMPORTANT! Never mix antifreeze (glycol)
and anti-corrosive agents. The two combined
can produce foam and drastically reduce the
coolant’s effectiveness.
Coolant. Filling
WARNING! Do not open the engine coolant
system filler cap when the engine is still hot ex-
cept in an emergency. Steam or hot coolant
may spray out.
Turn the filler cap to the first stop and let any pres-
sure 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 operat-
ing temperature. The level is normally lower when
the engine is cold. Reinstall the filler cap.
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