CYLINDER GP 4T1659 - Caterpillar

moves downward on the inlet stroke. When the inlet valves open, cooled compressed air from the inlet chamber within the inlet manifold is pulled into the cylinder. The piston begins to move up on the compression stroke when the inlet valves close. The air in the cylinder is compressed and the fuel is injected into the cylinder when the piston is near the top of the compression stroke. Combustion begins when the fuel mixes with the air. The force of combustion pushes the piston downward on the power stroke. The exhaust valves open and the exhaust gases are pushed through the exhaust port into exhaust manifold (1). After the piston makes the exhaust stroke, the exhaust valves close and the cycle begins again.Exhaust gases from the exhaust manifold (1) flow into the turbine side of the high pressure turbocharger. This causes turbocharger turbine wheel (5) to turn. The compressed gases from the high pressure turbocharger enter the turbine side of the low pressure turbocharger turbine wheel (9). The turbine wheels are connected to the shafts that drive the compressor wheels. Exhaust gases from the low pressure turbocharger pass through the low pressure turbocharger exhaust outlet (10) .Aftercooler
Illustration 3 g01246603
Aftercooler (1) Aftercooler (2) PipeThe aftercooler (1) cools the air that comes from the turbochargers. The air then flows into the inlet manifold. The aftercooler is located toward the rear of the engine between the cylinder heads. Coolant from the water pump flows into the aftercooler and through the core assembly. The coolant flows out of the aftercooler through a different pipe. The coolant then flows into the rear of the cylinder block.The inlet air from the compressor side of the turbochargers flows into the aftercooler through a pipe (2) on each side of the aftercooler housing. This lowers the temperature of the air to approximately 93°C (200°F). The cooler air flows out of the bottom of the aftercooler and into the inlet manifold. The dense air goes into the combustion chambers. This helps to provide lowered fuel consumption and increased horsepower output.Turbocharger
Illustration 4 g01246605
Turbocharger (1) Low pressure turbocharger (2) High pressure turbocharger (3) Exhaust pipeThere are two turbochargers (1) and (2) that are installed on each side of the engine. The first turbocharger (high pressure), on each side, is connected to the exhaust manifold. Exhaust gases from the turbine side of the first turbocharger are routed to the turbine side of the second turbocharger (low pressure). The exhaust flows through the exhaust pipe (3). The compressor side of the first turbocharger is connected to the compressor side of the second turbocharger by pipe assembly. The compressed air is then forced into the aftercooler housing.
Illustration 5 g01246608
Turbocharger (4) Exhaust inlet (5) Bearing (6) Lubrication passage (7) Bearing (8) Oil outlet port (9) Air outlet (10) Spacer (11) Air inlet (12) Compressor wheel (13) Compressor housing (14) Oil inlet port (15) Thrust collar (16) Thrust bearing (17) Turbine housing (18) Turbine wheel (19) Exhaust outletThe exhaust gases go through the blades of the turbine