Cooling system
82
Freshwater system
The freshwater is circulated via the cooling ducts and
heat exchanger of the engine by a centrifugal pump.
On D2 and D6 engines also the charge air cooler is
integrated in the freshwater circuit.
As long as the coolant is cold, the thermostat(s) remain
closed, preventing the coolant from passing to the heat
exchangers. Instead the coolant flows in a bypass duct
directly back to the suction side of the pump. This en-
sures that the engine rapidly reaches its working tem-
perature. The thermostats also prevent the engine tem-
perature from falling at low load and in cold weather.
Coolant mixture
WARNING! All glycol is hazardous and harmful
to the environment. Do not consume!
Glycol is flammable.
IMPORTANT! Ethylene glycol must not be mixed
with other types of glycol.
Mix: 40 % "Volvo Penta Coolant" (conc. coolant)
and 60 % water.
Note! D9 CAC-circuit: 20 % "Volvo Penta Cool
ant" (conc. coolant) and 80 % water.
This mixture protects the engine against internal cor-
rosion, cavitation and frost damage down to -28 °C
(-8°F). (Using 60 % glycol lowers the freezing point to
-54 °C (-65°F)). Never mix more than 60 % concentrate
(Volvo Penta Coolant) in the cooling liquid, this will give
reduced cooling effect and increase the risk of over-
heating, and will give reduced freezing protection.
IMPORTANT! Coolant must be mixed with pure
water, use
distilled - deionized water. The water
must
fulfill the requirements specified by Volvo
Penta, see "Water quality".
IMPORTANT! It is extremely important that the
correct concentration of coolant is added to the
system. Mix in a separate, clean vessel before
adding into the cooling system. Ensure that the
liquids mix properly.
Water quality
ASTM D4985:
Total solid particles ........................................ < 340 ppm
Total hardness:............................................... < 9.5° dH
Chloride ......................................................... < 40 ppm
Sulfate ............................................................ < 00 ppm
pH value ......................................................... 5,5–9
Silica (acc. ASTM D859) ................................ < 20 mg SiO
2
/l
Iron (acc. ASTM D068) ................................ < 0.0 ppm
Manganese (acc. ASTM D858) ...................... < 0.05 ppm
Conductivity (acc. ASTM D25) ................... < 500 µS/cm
Organic content, COD
Mn
(acc. ISO8467) ....... < 5 mg KMnO
4
/l
Содержание D11 series
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