GEAR (81 Teeth) 7S8572 - Caterpillar

Illustration 1 g02158880
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) Aftercooler
(5) Turbocharger turbine
(6) Water pump
(7) Radiator 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 aftercooler (4) where the compressed air is cooled by the flow of jacket water. 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 (5), which provides the energy that operates the turbocharger compressor.In the jacket water cooling system, the coolant flow is divided. Water pump (6) forces some of the coolant through the engine coolant passages. The coolant circulates through the engine and the engine exchanges heat with the coolant. The remainder of the coolant is routed through the aftercooler where the warmed, compressed air exchanges heat with the coolant. The coolant from the engine and from the aftercooler are routed together through radiator (7). Air from the fan blows through the radiator in order to cool the coolant. The coolant is drawn back through the water pump.