BRACKET 3979947 - Caterpillar

Illustration 1 g02158315
The dashed lines with arrows represent air flow and the solid lines with arrows represent coolant flow.
(1) Air cleaner
(2) Engine
(3) Turbocharger compressor
(4) Turbocharger turbine
(5) Water pump
(6) Air-to-air aftercooler
(7) Radiator There is no coolant flow in the air-to-air aftercooling system. The system is isolated from the jacket water cooling system.Fresh air is drawn through air cleaner (1) into turbocharger compressor (3). The air is compressed and the air is warmed by the compression. The compressed air flows through the fins of aftercooler (6) where the compressed air is cooled by the air flow from the fan. The cooled, compressed air becomes more dense, enabling engine (2) to burn more fuel in order to provide more power. The exhaust from the engine flows through turbocharger turbine (4), which provides the energy that operates the turbocharger compressor.In the jacket water cooling system, water pump (5) forces the coolant through the engine coolant passages. The coolant circulates through the engine and the engine exchanges heat with the coolant. The warmed coolant flows through radiator (7). Air from the fan flows through the aftercooler and around the aftercooler in order to cool the coolant in the radiator. The coolant is drawn back through the water pump.