Maintenance
Freshwater System The freshwater system is the engine's internal cooling system that ensures that the engine operates at the correct temperature. It is a closed system that must always be filled with a coolant mixture in order to protect the engine against internal corrosion, cavitation and frost bursting. IMPORTANT! Coolant of a suitable chemical composition must be used all year round. This applies even when there is no risk for frost damage, so that the engine always has complete corrosion protection. The use of anti-corrosion agents alone is not permitted in Volvo Penta engines. Never use water alone as the coolant. The corrosion protection additives become less effective over time, which means that the coolant must be changed at regular intervals; refer to Maintenance Schedule page 67. The cooling system must be flushed whenever the coolant is changed, refer to Freshwater system, Flushing. Volvo Penta recommend ”Volvo Penta Coolant VCS, Ready Mixed” or the concentrate ”Volvo Penta Coolant VCS” mixed with pure water according to specifications, see Water Quality. Volvo Penta Coolant VCS and VCS Ready Mixed are based on organic acid technology (OAT). Using other types of coolant, such as conventional or hybrid types, can drastically reduce the heat transfer and result in overheating of the engine.
47701352 04-2011
81
