Volvo Penta D7A T Operator's Manual page 52

Maintenance: Cooling system general
Cooling system D7A TA HE
The system includes two circuits. The freshwater system is cooling the charge air, the cylinder liners and the cy-
linder heads. An engine driven cooling water pump circulate the coolant through the heat exchanger and through
the engine. The rawwater system is cooling the coolant in the freshwater cooling system. The rawwater system is
connected to a seawater inlet or a central cooling system.
Drain points freshwater system
Drain points rawwater system
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1. Engine
2. Freshwater pump
3. Thermostat valve
4. Expansion tank
5. Charge air cooler
6. Heat exchanger
7. Rawwater pump
8. Freshwater circuit
9. Rawwater circuit