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The cooling system is an extremely important part of the engine assembly. A correct working temperature contributes to a longer operational lifespan of the engine and improved fuel economy. It is also important from a safety aspect. With a correctly dimensioned and correctly installed cooling system, overheating of the engine, unnecessary stoppages and expensive repairs due to engine failure, can be avoided.

Cooling systems can be of two different types:

sea water cooled (direct cooling), where sea water is directly pumped into the engine’s cooling system and subsequently discharged via the exhaust system (wet exhaust systems) or via a separate discharge point for cooling water (for dry exhaust systems).

fresh water cooled (indirect cooling) where the engine has its own closed loop cooling system similar to that of a motor car. The temperature of the engine coolant is reduced by being passed through a heat exchanger which is itself cooled by a supply of continuously pumped sea water. The sea water is discharged either via the exhaust, when used with a wet exhaust system, or via a separate outlet, when used with a dry exhaust system.

Freshwater cooling has a number of advantages compared to sea water cooling, these being:

- Better comfort, i.e. availability of domestic hot water and onboard heating. More extensive usage.

- The anti-freeze and anti-corrosion agents contained within the coolant permit all year running. Should it be required to totally decommission the engine, the coolant channels can simply be filled with inhibitors.

- Reduced engine wear as a result of higher running temperatures.

- Extended engine life due to better corrosion protection.

It is a relatively simple operation to fit a fresh water cooling system to a sea water cooled engine.

Sea water cooling
1. Exhaust bend, wet type
2. Engine cooling galleries
3. Vacuum valve
4. Sea water pump
5. Sea water filter
6. Cooling water intake
7. Hose

Fresh water cooling
1. Exhaust bend, wet type
2. Engine cooling galleries
3. Vacuum valve
4. Sea water pump
5. Sea water filter
6. Cooling water intake
7. Hose
8. Heat exchanger
9. Expansion tank
10. Hot water outlet
11. Hot water heater



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