Maintenance Cooling System Raw Water System Various Volvo Penta engines have a thermostat-con- trolled cooling system. 1. Cool water is drawn in through raw water intake ( A ) by an impeller ( C ) connected to the raw water pump ( D ) mounted on the front of the engine. 2. Water is pumped to the engine and routed by cir- culating water through the cooling system ( B ). 21205 3. A thermostat inside the engine determines the amount of water to be taken in, recirculated, and discharged to control the engine’s operating tem- peratures.
Closed Cooling System (F-Series) 7743722 - Downloaded from www.volvopenta.com 13/05/2008 20:17:06 Various Volvo Penta engines have a thermostat-con- trolled, recirculating type cooling system. 1. Cool water is drawn in through raw water intake ( E ) by an impeller ( F ) connected to the raw water pump ( G ) mounted on the front of the engine. 2. Water is pumped ( H ) to the heat exchanger ( I ), which cools the engine cooling fluid ( J ). The raw water is then routed to the exhaust manifolds where it is mixed with exhaust and dumped over- board through the sterndrive exhaust port. 3.
The engine cooling fluid is recirculated between the engine and the heat exchanger by the engine circulation pump ( K ). 4. A thermostat inside the engine determines the amount of water to be taken in, recirculated, and discharged to control the engine’s operating tem- peratures. 21207 Engine Overheating (Gi & GXi only) If the engine overheats at high engine speeds, the en- gine protection mode feature will activate and: Engine speed will be automatically reduced to approximately 2500 RPM. The engine will not operate above 2500 RPM. If an engine overheat alarm has been installed, an audible warning horn will sound.
The engine protection mode feature will remain active until the engine has been reduced to below 1200 RPM and the overheating problem is corrected. For additional information, see Engine Protection Mode on page 24. CAUTION! Do not remove the thermostat from the engine as the engine is likely to over- heat. 84 VPA 7743722 English 10-2004