SHAFT AS 3043268 - Caterpillar

Illustration 1 g00281664
Turbocharger (typical example) (1) Compressor wheel (2) Bearing (3) Oil inlet (4) Bearing (5) Turbine wheel (6) Exhaust outlet (7) Air inlet (8) Coolant passages (9) Oil outlet (10) Exhaust inletThe exhaust gases go into exhaust inlet (10) of the turbine housing. The gases push the blades of turbine wheel (5). The turbine wheel and the compressor wheel turn at speeds up to 90,000 rpm.Clean air from the air cleaners is pulled through air inlet (7) by the rotation of compressor wheel (1). The action of the compressor wheel blades compresses the inlet air. The compressed air allows the engine to burn additional fuel with greater efficiency.Bearing (2) and bearing (4) in the turbocharger use engine oil under pressure for lubrication. The oil is sent through the oil inlet line to oil inlet (3) at the top. The oil then goes through passages in the center section for lubrication of the bearings. The oil goes out of oil outlet (9) at the bottom. The oil then goes back to the engine block through the drain line.The bearing housing in the turbocharger is also cooled by the jacket water coolant. Coolant from the coolant inlet line enters the side of the center section. The coolant travels through coolant passages (8) in the bearing housing. The coolant then leaves the turbocharger at the other side of the center section. The coolant outlet lines then take the coolant back to the jacket water radiator top tank.