LINES GP-CHASSIS 4360406 - Caterpillar

Illustration 4 g00825487
Typical example
(1) Turbine housing
(2) Compressor housing
(3) Outlet for the air from the compressor
(4) Air inlet for the compressor
(5) Outlet for the exhaust from the turbine
(6) Inlet for the exhaust to the turbine
(7) Outlet for the engine oil Turbine housing (1) is connected between the exhaust manifold and the exhaust elbow. Compressor housing (2) is connected between the air cleaners and the aftercooler.Exhaust gas flows into the turbocharger through inlet (6). The exhaust gas pushes the blades of the turbine wheel in the turbine housing. The exhaust gas exits the turbine housing through outlet (5).The turbine wheel is connected to a compressor wheel in the compressor housing. Rotation of the turbine wheel causes the compressor wheel to rotate.Clean air from the air cleaner is drawn into air inlet (4) by the rotation of the compressor wheel. The compressor wheel compresses the inlet air. The air exits the compressor housing through outlet (3) and the air flows to the aftercooler. Compression of the air provides the engine with more power because the engine can burn additional fuel with greater efficiency.Pressurized engine oil enters an inlet to passages in the center section of the turbocharger in order to lubricate the bearings. The engine oil exits through outlet (7).The bearing housing in the turbocharger is cooled by coolant that flows through coolant passages in the bearing housing.Exhaust Bypass
Illustration 5 g00815802
Vee engines
(1) Electrohydraulic actuator
(2) Linkage
Illustration 6 g00895410
In-line engines
(1) Electrohydraulic actuator (not shown)
(2) Linkage Actuator (1) for the exhaust bypass receives an electronic command signal from the ECM. The command signal is a pulse width modulated signal (PWM). The signal is based on the difference between the average combustion burn time and the desired combustion burn time. The signal causes the actuator to move linkage (2) in order to operate the exhaust bypass.When the ECM requests a slower combustion burn time or a leaner air/fuel ratio, the actuator moves the exhaust bypass toward the closed position. This directs more of the exhaust gas to the turbocharger turbine wheel. The additional exhaust gas increases the rpm of the turbine wheel and of the compressor wheel. A greater quantity of air is compressed for combustion. This increases the amount of air in the air/fuel mixture.When the ECM requests a faster combustion burn time or a richer air/fuel ratio, the actuator opens the plate of the exhaust bypass. This diverts some of the exhaust gas directly to the exhaust elbow instead of through the turbocharger. The reduction of exhaust gas to the turbine wheel reduces the rpm of the turbine wheel and of the compressor wheel. Less inlet air is compressed for combustion. This reduces the amount of air in the air/fuel mixture.Air Choke
Illustration 7 g00815989
Vee engines
(1) Electrohydraulic actuator
(2) Linkage
Illustration 8 g00895414
In-line engines
(1) Electrohydraulic actuator
(2) Linkage Actuator (1) receives an electronic command signal from the ECM. The signal is based on the exhaust port temperatures. The signal causes the actuator to move linkage (2) in order to operate the air choke. Movement of the air choke's plate controls the flow