Engines with a Heat Exchanger
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| Illustration 1 | g03685836 |
Typical example (A) Coolant circuit (B) Sea water circuit (1) Turbocharger (2) Exhaust manifold (3) Water temperature regulator (4) Engine oil cooler (5) Engine (6) Heat exchanger (7) Aftercooler (8) Water pump (9) Expansion tank (10) Auxiliary water pump | |
Coolant Circuit
During engine operation, water pump (8) draws engine coolant from heat exchanger (6). The water pump creates coolant flow through the system. The water pump is installed on the front of the timing case. The water pump is gear-driven by the fuel injection pump gear.
Water pump (8) forces the coolant through a passage in the front of the timing case to the water jacket in the top left side of the cylinder block. One-third of the coolant flows around the element of oil cooler (4) to the rear of the cylinder block. Two-thirds of the coolant is used in order to cool the cylinder block. The coolant continues to the rear of the cylinder block and the coolant is diverted to the following locations:
- Exhaust manifold (2)
- Cylinder head
- Preheater (if equipped)
The coolant flows forward through the cylinder head and into water temperature regulator (3). If the water temperature regulator is closed, the coolant goes directly through a bypass to the inlet side of water pump (8). If the water temperature regulator is open, the bypass is closed and the coolant flows to heat exchanger (6) in order to be cooled. After the coolant flows through the heat exchanger, the coolant is mixed with coolant that is returning from exhaust manifold (2) and preheater (if equipped).
Sea Water Circuit
During engine operation, auxiliary water pump (10) draws cool sea water into the system. The auxiliary water pump pumps the sea water to aftercooler (7). The cool sea water flows through aftercooler (7) in order to cool the hot inlet air. From the aftercooler, the sea water flows to heat exchanger (6) in order to cool the hot engine coolant. After leaving the heat exchanger, the sea water is then discharged.
Engines with a Keel Cooler
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| Illustration 2 | g03685261 |
Typical example (1) Remote tank (2) Turbocharger (3) Manifold (4) Exhaust manifold (5) Engine (6) Engine oil cooler (7) Water pump (8) Auxiliary water pump (9) Aftercooler (10) Keel cooler for aftercooler (11) Keel cooler (12) Water temperature regulator | |
During engine operation, water pump (7) draws engine coolant from keel cooler (11). The water pump creates coolant flow through the system. The water pump is installed on the front of the timing case. The water pump is gear-driven by the fuel injection pump gear.
Water pump (7) forces the coolant through a passage in the front of the timing case to the water jacket in the top left side of the cylinder block. One-third of the coolant flows around the element of oil cooler (6) to the rear of the cylinder block. Two-thirds of the coolant is used in order to cool the cylinder block. The coolant continues to the rear of the cylinder block and the coolant is diverted to the following locations:
- Exhaust manifold (4)
- Cylinder head
The coolant flows forward through the cylinder head and into water temperature regulator (12). If the water temperature regulator is closed, the coolant goes directly through a bypass to the inlet side of water pump (7). If the water temperature regulator is open, the bypass is closed and the coolant flows to keel cooler (11) in order to be cooled. After the coolant flows through the keel cooler, the coolant is mixed with coolant that is returning from exhaust manifold (4) .
An auxiliary water pump (8) is also used in order to supply coolant flow to aftercooler (9). The coolant flows through the aftercooler in order to cool the hot inlet air. From the aftercooler, the coolant flows to a second keel cooler (10) in order to be cooled.
Fresh Water Cooling System with Radiator
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| Illustration 3 | g03685943 |
Typical example (1) Radiator (2) Charge air cooler (3) Turbocharger (4) Water temperature regulator (5) Manifold (6) Water pump (7) Engine | |
The coolant flows from the bottom of the radiator (1) to the centrifugal water pump (6). The water pump (6) is installed on the front of the timing case. The water pump is driven by a gear. The gear of the fuel injection pump drives the water pump gear. The water pump forces the coolant through a passage in the timing case to the front of the engine (7) .
The coolant enters a passage in the left side of the engine (7). Some coolant enters the cylinder block. Some coolant passes over the element of the oil cooler. The coolant then enters the cylinder block. Coolant flows around the outside of the cylinders then flows from the cylinder block into the cylinder head. The coolant then flows from the cylinder head to a manifold (5). The coolant then flows from the manifold (5) back to the water pump (6) .
The coolant flows forward through the cylinder head. The coolant then flows into the housing of the water temperature regulator (4). If the water temperature regulator (4) is closed, the coolant goes directly through a bypass to the inlet side of the water pump. If the water temperature regulator is open, and the bypass is closed then the coolant flows to the top of the radiator (1) .
Air Cooling System with Radiator
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| Illustration 4 | g03685959 |
Typical example (1) Radiator (1) Charge air cooler (3) Turbocharger (4) Engine | |
Air is forced out of the compressor outlet of the turbocharger (3). The air flows to the charge air cooler (2) that is mounted on the radiator (1). The air is then cooled in the charge air cooler (2). The cooled air then flows from the charge air cooler (2) back to the engine (4) .