RING-CENTERING 1A6775 - Caterpillar

The turbocharger is installed at the rear of the exhaust manifold.
Illustration 1 g00742139
(1) Air inlet
(2) Compressor wheel
(3) Lubrication inlet port
(4) Turbine wheel
(5) Thrust bearing
(6) Shaft bearings
(7) Connections for coolant lines
(8) Exhaust outlet The exhaust gas drives the blades of turbine wheel (4). This drives compressor wheel (2). The exhaust gas exits the turbocharger through outlet (8) to the exhaust stack.On high-pressure gas fuel systems, the compressor wheel pulls clean inlet air from the air cleaners through air inlet (1) of the compressor housing. The compressor wheel compresses the air. The turbocharger delivers compressed air to the carburetor. With low-pressure gas, the air and the fuel are mixed in the carburetor and the mixture is compressed by the turbocharger.The turbocharger bearings are lubricated with pressurized engine oil. The engine oil enters through port (3) into passages for lubrication of thrust bearing (5) and of shaft bearings (6). Engine oil leaves the turbocharger through an opening in the bottom of the center section. The engine oil returns to the engine oil pan.The turbine housing is cooled with coolant from lines that are attached to connections (7).