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. Seawater is then pumped through the heat exchanger and into the exhaust elbow pipe where it is mixed with the exhaust gases. The freshwater system is the internal engine coolant system. It is a closed system driven by the circulation 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.
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. IMPORTANT! Never use water alone. If the freshwater system is filled with antifreeze mixture it must be changed every other year. If the system is filled with anti-corrosion agent mixture it must be changed every year. We recommend that a mixture of water and Volvo Penta antifreeze is used all year round, regardless of the climate. Water quality To avoid the risk of blocking the cooling system the coolant should be mixed with clean water. If there is any doubt over the water quality distilled water or premixed coolant should be used. In event of risk of freezing Use a mixture of 50% Volvo Penta antifreeze (glycol) and 50% pure water. This mixture will protect against freezing to a temperature of approx. -40ºC (-40ºF) and should be used all year round. Mix the coolant in a separate container before filling. IMPORTANT! There should be at least 40% antifreeze in the system for complete protection against corrosion. WARNING! Glycol is harmful to health (dangerous if ingested).
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