BOOT 8J1623 - Caterpillar

Illustration 1 g02467317
Air inlet and exhaust system
(1) Aftercooler core
(2) Air filter
(3) Diesel particulate filter
(4) Back pressure valve
(5) Low-pressure turbocharger
(6) High-pressure turbocharger
(7) Wastegate actuator
(8) Exhaust cooler (NRS)
(9) Exhaust gas valve (NRS)
(10) Wastegate regulator The components of the air inlet and exhaust system control the quality of air and the amount of air that is available for combustion. The air inlet and exhaust system consists of the following components:
Air cleaner
Exhaust cooler (NRS)
Exhaust gas valve (NRS)
Turbochargers
Aftercooler
Inlet manifold
Cylinder head, injectors, and glow plugs
Valves and valve system components
Piston and cylinder
Exhaust manifold
Diesel oxidation catalyst
Diesel particulate filterAir is drawn in through the air cleaner into the air inlet of the low-pressure turbocharger by the low-pressure turbocharger compressor wheel. The air is compressed to a pressure of about 75 kPa (11 psi) and heated to about 120° C (248° F). From the low-pressure turbocharger, the air passes to the high-pressure turbocharger. The air is compressed to a pressure of about 220 kPa (32 psi) and heated to about 240° C (464° F) before the air is forced to the aftercooler. The air flows through the aftercooler. The temperature of the compressed air lowers to about 55° C (131° F). Cooling of the inlet air assists the combustion efficiency of the engine. Increased combustion efficiency helps achieve the following benefits:
Lower fuel consumption
Increased power output
Reduced NOx emission
Reduced particulate emissionFrom the aftercooler, the air flows to