Sea Water Cooling System
Note: A separate sea water cooling system should be provided for each engine.
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| Illustration 1 | g00745796 |
Typical arrangement (1) Sea water strainer (2) Auxiliary water pump (3) The diameter of the hose that connects to the sea water strainer is 32 mm (1.25 inch). (4) The diameter of the hose that connects to the valve for the sea water is 32 mm (1.25 inch). (5) The diameter of the valve for the sea water is 25.4 mm (1.00 inch). (6) The skin fitting has a diameter of 25.4 mm (1.00 inch). | |
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| Illustration 2 | g00745850 |
The sea water strainer should be mounted so that the top of the sea water strainer is just above the level of the sea water. By having the sea water at this level, the sea water strainer can be easily cleaned. (1) Sea water strainer (2) Auxiliary water pump (5) Valve for the sea water (7) Level of the sea water | |
The fitting for the sea water inlet (6) should not project below the bottom of the hull. The fitting for the sea water inlet should be installed away from rudders and shafts. This will prevent a problem with the flow of sea water at high speeds. The rear edge of the sea water inlet may project more than the front of the sea water inlet. The rear edge of the inlet for the sea water cannot project more than 6 mm (0.25 inch) from the front edge of the inlet for the sea water.
The fittings for the sea water inlet and the piping for the sea water inlet should have a minimum bore of 25 mm (1 inch). A valve for the sea water (5) must be installed. The valve for the sea water must have a full flow passage.
Between the fitting for the sea water inlet and the auxiliary water pump (2), a sea water strainer (1) should be installed. The sea water strainer should be easily accessible for the purpose of maintenance.
A pipe should be run from the sea water strainer to the inlet of the auxiliary water pump (2). The pipe may be rigid or flexible. The flexible pipe section should be reinforced in order to prevent a collapse. Rubber hose connections in the sea water inlet system should be kept as short as possible. Rubber hose connections should also be reinforced. The system must be flexible. This will permit the engine to move on the flexible engine mounts.
The materials that are used in the sea water system must be compatible with each other. This will help prevent excessive corrosion because of electrolysis. The following metals can be used in a sea water system:
- Copper
- Cupronickel
- Stainless steel Type 316
- Gunmetal
- Silver solder
- Aluminum brass
The following metals should be avoided in a sea water system:
- Lead
- Iron
- Steel
- Zinc
- Magnesium
- Aluminum
- Alloys of aluminum
Keel Cooling System
Naturally Aspirated 3054B Marine Engine and Turbocharged 3054 Marine Engine
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| Illustration 3 | g00786736 |
Typical connections for the keel cooling system for the naturally aspirated 3054B and the turbocharged 3054 Marine engines The arrows indicate the direction of flow. (1) The diameter for the outlet for the keel cooling system is 45.0 mm (1.75 inch). (2) The diameter for the inlet for the keel cooling system is 45.0 mm (1.75 inch). (3) Jacket water pump | |
Both the naturally aspirated 3054B Marine engine and the turbocharged 3054 Marine engine are suitable for a keel cooling system.
| Requirements for Keel Cooling Systems for the Naturally Aspirated 3054B Marine Engine and Turbocharged 3054 Marine Engine | |
| Circuit for the Engine Coolant | |
| Heat rejection | 60 kW (3400 Btu/min) for the 3054 naturally aspirated engine 74 kW (4200 Btu/min) for the 3054 turbocharged engine |
| Coolant temperature at the exit of the keel cooler | 60 °C (140 °F) |
| Coolant flow through the keel cooler | 45 to 70 L/min (12 to 19 US gpm) |
| Piping | Refer to Illustration 3. |
The length of the piping between the engine and the keel cooler must be as short as possible. To achieve a short distance, the piping must be as direct as possible. The piping must also be flexible so that the engine is allowed to move on the flexible engine mounts. Venting points should be installed so that air can be removed from the system.
The keel cooling system should use the correct mixture of water and antifreeze. Refer to the Operation and Maintenance Manual, "Cooling Systems Specifications" for more information on the correct mixture.
Naturally Aspirated 3056 Marine Engines
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| Illustration 4 | g00757511 |
Typical connections for the keel cooling system for the naturally aspirated 3056 Marine engine The arrows indicate the direction of flow. (1) The diameter of the inlet for the engine is 45 mm (1.75 inch). (2) The diameter of the outlet for the engine is 45 mm (1.75 inch). (3) Marine transmission oil cooler (if equipped) | |
The naturally aspirated 3056 Marine engine is suitable for a keel cooled system. Refer to Illustration 4 for the connections that are needed.
| Requirements for Keel Cooling Systems for the Naturally Aspirated 3056 Marine Engine | |
| Circuit for the Engine Coolant | |
| Heat rejection | 123 kW (7000 Btu/min) |
| Coolant temperature at the exit of the keel cooler | 60 °C (140 °F) |
| Coolant flow through the keel cooler | 77 L/min (20 US gpm) |
| Piping | Refer to Illustration 4. |
The length of the piping between the engine and the keel cooler must be as short as possible. To achieve a short distance, the piping must be as direct as possible. The piping must also be flexible so that the engine is allowed to move on the flexible engine mounts. Venting points should be installed so that air can be removed from the system.
The keel cooling system should use the correct mixture of water and antifreeze. Refer to the Operation and Maintenance Manual, "Cooling Systems Specifications" for more information on the correct mixture.
Turbocharged Aftercooled 3056 Marine Engines
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| Illustration 5 | g00745799 |
Typical connections for the keel cooling system for the turbocharged aftercooled 3056 Marine engine The arrows indicate the direction of flow. (1) The diameter of the inlet for the aftercooler circuit is 32 mm (1.25 inch). (2) The diameter of the inlet for the engine coolant is 45 mm (1.75 inch). (3) The diameter of the hose for the aftercooler circuit is 32 mm (1.25 inch). (4) Keel cooler for engine coolant (5) Keel cooler for aftercooler (6) The diameter of the outlet for the aftercooler circuit is 32 mm (1.25 inch). (7) The diameter of the outlet for the engine is 45 mm (1.75 inch). (8) The diameter of the hose for the outlet of the engine coolant is 45 mm (1.75 inch). | |
The turbocharged aftercooled 3056 Marine engine is suitable for a keel cooled system. Two separate coolers are needed. One keel cooler is needed for the engine coolant. One keel cooler is needed for the aftercooler circuit. Refer to Illustration 5 for the connections that are needed.
| Requirements for Keel Cooling Systems for the Turbocharged Aftercooled 3056 Marine Engine | |
| Circuit for the Engine Coolant | |
| Heat rejection | 132 kW (7500 Btu/min) |
| Coolant temperature at the exit of the keel cooler | 60 °C (140 °F) |
| Coolant flow through the keel cooler | 77 L/min (20 US gpm) |
| Piping | Refer to Illustration 5. |
| Aftercooler Circuit that Includes the Marine Gear Oil Cooler | |
| Heat rejection | 25 kW (1400 Btu/min) |
| Coolant temperature at the exit of the keel cooler | 38 °C (100 °F) |
| Coolant flow through the keel cooler | 123 L/min (33 US gpm) |
| Piping | Refer to Illustration 5. |
The length of the piping between the engine and the keel cooler must be as short as possible. To achieve a short distance, the piping must be as direct as possible. The piping must also be flexible so that the engine is allowed to move on the flexible engine mounts. Venting points should be installed so that air can be removed from the system.
The keel cooling system should use the correct mixture of water and antifreeze. Refer to the Operation and Maintenance Manual, "Cooling Systems Specifications" for more information on the correct mixture.