ENGINE AR 2393052 - Caterpillar

Fresh Water Circuit
Illustration 1 g06014734
C7.1 Propulsion Fresh Water Cooling System
(1) Bleed
(2) Header Tank/Heat Exchanger
(3) Turbocharger
(4) Thermostat
(5) Engine
(6) Fresh Water PumpDuring engine operation, water pump (6) draws engine coolant from heat exchanger (2). 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 (6) 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. Two-thirds of the coolant are used 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
Cylinder headThe coolant flows forward through the cylinder head and into the thermostat (4). If the thermostat is closed, the coolant goes directly through a bypass to the inlet side of water pump (6). If the thermostat is open, the bypass is closed and the coolant flows to heat exchanger (2) to be cooled. After the coolant flows through the heat exchanger, the coolant is mixed with coolant that is returning from exhaust manifold and preheater (if equipped).Sea Water Circuit
Illustration 2 g06014772
C7.1 Propulsion Sea Water Cooling System
(2) Header Tank/Heat Exchanger
(5) Engine
(7) Water Cooled Exhaust (optional)
(8) Gearbox Oil Cooler (optional)
(9) Aftercooler
(10) Fuel Cooler
(11) Auxiliary Water PumpDuring engine operation, auxiliary water pump (11) draws cool sea water into the system. The auxiliary water pump pumps the sea water to aftercooler (9). The cool sea water flows through aftercooler (9) to cool the hot inlet air. From the aftercooler, the sea water flows to heat exchanger (2) to cool the hot engine coolant. After leaving the heat exchanger, the sea water is then discharged.