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Cooling system Engine accessories

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

 
Neutra-salt
Neutra-salt
Seawater strainer
Seawater strainer
The seawater filter should be installed in the cooling system’s suction line above the water line. The filter effectively separates any impurities fro...
Hose adapters
Hose adapters
For connection of seawater filter to cooling hoses of other diameters, cut adapter if necessary. Hose clamps for connection to filter included. Hose c...
Vacuum valve
Vacuum valve
For vessels with an engine installation at or below the water line a vacuum valve should be installed. The valve prevents siphonage occurring through ...
Service kit, vacuum valve
Service kit, vacuum valve
 
Hot water outlet
Hot water outlet
A hot water connection is made to the engine cooling system which allows the hot coolant water to circulate through a water heater. The hot coolant he...
Cooling water intake
Cooling water intake
The cooling water intake is a through-hull fitting with strainer, installed through the bottom of the hull. For motor boats the strainer should be dir...
Rubber hoses
Rubber hoses
Volvo Penta rubber hoses are specifically designed for use with the engine’s cooling system and are designed to withstand both suction and pressure.
Freshwater cooling
Freshwater cooling
The kits are designed to modify seawater cooled engines for use with freshwater cooling. Refer also to the system description.
Expansion tank
Expansion tank
A separate expansion tank for engine coolant can be installed in an easily accessible position and thereby make checking and filling of the system con...
Conversion kit for larger expansion tank
Conversion kit for larger expansion tank
The conversion kit can be used to obtain an expansion tank of greater volume. The larger tank permits the installation of a coolant level alarm 861759...