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| Illustration 1 | g00793830 |
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Typical jacket water circuit for the 3054 and 3054B Marine engine The solid arrows indicate the direction of flow. The dashed arrows indicate the direction of flow in piping for the expansion of the coolant in the vent passage. The dashed arrows indicate bypass lines or vent lines. (1) Engine oil cooler (2) Heat exchanger (3) Water temperature regulator (thermostat) (4) Water cooled exhaust manifold (5) Cylinder head (6) Expansion tank (7) Vent lines (8) Jacket water pump (9) Cylinder block | |
Coolant is pulled from the heat exchanger (2) into the jacket water pump (8) by impeller action. The jacket water pump is located on the front left side of the engine. The jacket water pump is gear-driven.
The coolant is pumped through the cylinder block (9). The coolant is distributed around each cylinder. At each cylinder, coolant enters the cylinder head (5). The coolant then enters the water outlet manifold. The coolant then enters the water cooled exhaust manifold (4). The coolant then flows to the water temperature regulator (3). With the water temperature regulator in the closed position, the coolant bypasses the heat exchanger (2) and flows back to the jacket water pump (8) for recirculation. With the water temperature regulator in the open position, the coolant is directed through the heat exchanger (2) and back to the water pump inlet.
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| Illustration 2 | g00794089 |
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Typical jacket water circuit for the 3056 Marine engine The solid arrows indicate the direction of flow. The dashed arrows indicate the direction of flow in piping for the expansion of the coolant in the vent passage. The dashed arrows indicate bypass lines or vent lines. (10) Aftercooler (11) Cylinder head (12) Cylinder block (13) Vent lines (14) Expansion tank (15) Jacket water pump (16) Bypass for the water temperature regulator (17) Heat exchanger (18) Water temperature regulator (thermostat) | |
Coolant is pulled from the heat exchanger (17) into the jacket water pump (15) by impeller action. The jacket water pump is located on the front left side of the engine. The jacket water pump is gear-driven.
The coolant is pumped through the cylinder block (12). The coolant is distributed around each cylinder. At each cylinder, coolant enters the cylinder head (11). The coolant then enters the water outlet manifold. The coolant then enters the aftercooler (10). The coolant then flows to the water temperature regulator (18). With the water temperature regulator in the closed position, the coolant flows through the water temperature regulator. The coolant bypasses the heat exchanger (17) and flows back to the jacket water pump for recirculation. With the water temperature regulator in the open position, the coolant is directed through the heat exchanger (17) and back to the water pump inlet.
Three types of external cooling systems can be used on the 3054 Marine engine, the 3054B Marine engine, and the 3056 Marine engine. The sea water circuit and a keel cooling system are two types of external cooling systems for the marine engine. Both systems are separate from the jacket water circuit. The sea water circuit is necessary in order to cool the jacket water. The sea water circuit removes the heat from the jacket water.
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| Illustration 3 | g00793829 |
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Typical sea water circuit for the 3054 and 3054B Marine engine The solid arrows indicate the direction of flow. (1) Heat exchanger (2) Water injection elbow (3) Marine transmission oil cooler (4) Engine (5) Auxiliary water pump (6) Inlet for the sea water | |
The auxiliary water pump (5) pulls sea water into the sea water circuit through the inlet for the sea water (6). The auxiliary water pump (5) supplies a continuous flow of sea water through the marine transmission oil cooler (3). The sea water then flows to the heat exchanger (1). The sea water is discharged through the exhaust in the water injection elbow (2). The sea water mixes with the exhaust. The mixture exits the vessel. The sea water performs several functions:
- The sea water cools the jacket water.
- The sea water cools the exhaust.
- The sea water silences the exhaust.
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| Illustration 4 | g00794232 |
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Typical sea water circuit for the 3056 Marine engine The solid arrows indicate the direction of flow. (7) Inlet and exhaust manifold (8) Water injection elbow (9) Marine transmission oil cooler (10) Engine (11) Auxiliary water pump (12) Heat exchanger (13) Inlet for the sea water | |
The auxiliary water pump (11) pulls sea water into the sea water circuit through the inlet for the sea water (13). The auxiliary water pump (11) supplies a continuous flow of sea water through the marine transmission oil cooler (9). The sea water then flows to the heat exchanger (12). The sea water is discharged through the exhaust in the water injection elbow (8). The sea water mixes with the exhaust. The mixture exits the vessel. The sea water performs several functions:
- The sea water cools the jacket water.
- The sea water cools the exhaust.
- The sea water silences the exhaust.
Two types of external cooling systems can be used on the 3054, 3054B and 3056 Marine engines. The sea water circuit and a keel cooling system are two types of external cooling systems for the marine engine. Both systems are separate from the jacket water circuit. The keel cooling system is necessary in order to cool the jacket water. The keel cooling system removes the heat from the jacket water.
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| Illustration 5 | g00793831 |
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Typical arrangement of a keel cooling system for the turbocharged 3054 and 3054B Marine engine The solid arrows indicate direction of flow. The dashed arrows indicate the direction of flow in piping for the expansion of the coolant in the vent passage. The dashed arrows indicate bypass lines or vent lines. (1) Marine transmission oil cooler (2) Water temperature regulator (thermostat) (3) The heat exchanger is inside of the inlet and exhaust manifold. (4) Engine (5) Jacket water pump (6) Vent lines (7) Keel cooler for the jacket water (8) Engine oil cooler (9) Bypass for the expansion tank (10) Expansion tank | |
The jacket water pump (5) pumps coolant through the keel cooler for the jacket water (7). The coolant then flows to marine transmission oil cooler (1). The jacket water pump (5) pumps coolant through the engine (4). The coolant is distributed around each cylinder. At each cylinder, coolant enters the cylinder head. The coolant flows through the water outlet manifold and into the exhaust manifold (3). The coolant then flows to the water temperature regulator (2). With the water temperature regulator in the closed position, the coolant flows through the water temperature regulator. The coolant bypasses the keel cooler for the jacket water (7). The coolant then flows back to the jacket water pump for recirculation. With the water temperature regulator in the open position, the coolant is directed through the keel cooler for the jacket water (7). The coolant then passes through the keel cooler (7) on the bottom of the hull. Raw water passes over the keel. The keel dissipates the heat. The coolant is again pumped through the circuit by the jacket water pump (5).
Turbocharged Aftercooled 3056 Engine
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| Illustration 6 | g00794036 |
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Typical arrangement of a keel cooling system for the Turbocharged Aftercooled 3056 Marine engine The solid arrows indicate direction of flow. The dashed arrows indicate the direction of flow in piping for the expansion of the coolant in the vent passage. The dashed arrows indicate bypass lines or vent lines. (11) Heat exchanger (12) Inlet and exhaust manifold (13) Marine transmission oil cooler (14) Vent lines (15) Engine (16) Expansion tank (17) Water temperature regulator (thermostat) (18) Bypass for the expansion tank (19) Jacket water pump (20) Keel cooler for the jacket water (21) Auxiliary water pump (22) Keel cooler for the aftercooler | |
The auxiliary water pump (21) pumps coolant through the heat exchanger (11). The coolant then flows to the marine transmission oil cooler (13). The coolant then passes through the keel cooler (22) for the aftercooler on the bottom of the hull. Raw water passes over the keel. The keel dissipates the heat. The coolant is again pumped through the circuit by the auxiliary water pump (21).
The jacket water pump (19) pumps the same coolant as the auxiliary water pump (21). Vent lines (14) are located in the system in order to tie the two systems together. The jacket water pump (19) pumps coolant through the engine (15). The coolant is distributed around each cylinder. At each cylinder, coolant enters the cylinder head. The coolant flows through the water outlet manifold and into the exhaust manifold (12). The coolant then flows to the water temperature regulator (17). With the water temperature regulator in the closed position, the coolant flows through the water temperature regulator. The coolant bypasses the keel cooler for the jacket water (20). The coolant then flows back to the jacket water pump for recirculation. With the water temperature regulator in the open position, the coolant is directed through the keel cooler for the jacket water (20). The coolant then passes through the keel cooler (20) on the bottom of the hull. Raw water passes over the keel. The keel dissipates the heat. The coolant is again pumped through the circuit by the auxiliary water pump (21).
Single Keel for Turbocharged Aftercooled 3056 Engine
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| Illustration 7 | g00759868 |
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Typical schematic of a keel cooling system that uses a single keel for turbocharged aftercooled 3056 Marine engines The solid arrows indicate direction of flow. The dashed arrows indicate the direction of flow in piping for the expansion of the coolant in the vent passage. The dashed lines indicate the piping for the vent passage. (1) Expansion tank (2) Aftercooler (3) Exhaust manifold (4) Marine transmission oil cooler (5) Keel cooler (6) Cylinder head (7) Jacket water pump (8) Cylinder block (9) Water temperature regulator (thermostat) (10) Heat exchanger (11) Auxiliary water pump | |
The single keel cooling system operates in the same manner as the keel cooling system for the turbocharged aftercooled engines. A jacket water pump (7) is used in the single keel cooling system and an auxiliary water pump (11) is used in the single keel cooling system. However, only one keel (5) is used. Refer to "3054 and 3054B Engines" for a complete description.
Naturally Aspirated 3056 Engine
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| Illustration 8 | g00794383 |
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Typical schematic of a keel cooling system for a naturally aspirated 3056 Marine engine The solid arrows indicate direction of flow. The dashed arrows indicate the direction of flow in piping for the expansion of the coolant in the vent passage. The dashed lines indicate the piping for the vent passage. (1) Exhaust manifold (2) Vent lines (3) Expansion tank (4) Engine oil cooler (5) Cylinder block (6) Jacket water pump (7) Engine oil filters (8) Water temperature regulator (thermostat) (9) Keel cooler | |
The keel cooling system for a naturally aspirated engine operates in the same manner as the keel cooling system for a turbocharged aftercooled engine. However, the naturally aspirated engines only use the jacket water pump (6) to pump the coolant. The jacket water pump (6) pumps coolant through the cylinder block (5). The coolant is distributed around each cylinder. At each cylinder, coolant enters the cylinder head. The coolant flows through the water outlet manifold and into the exhaust manifold (1). The coolant then flows to the water temperature regulator (8). With the water temperature regulator in the closed position, the coolant flows through the water temperature regulator. The coolant bypasses the keel cooler (9) and flows back to the jacket water pump for recirculation. With the water temperature regulator in the open position, the coolant is directed through the keel cooler (9). The coolant then passes through the keel cooler (9) on the bottom of the hull. Raw water passes over the keel. The keel dissipates the heat. The coolant is again pumped through the circuit by the jacket water pump (7).