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| Illustration 1 | g00281664 |
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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 inlet | |
The exhaust gases go into the 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.
Air and fuel are pulled through the compressor housing air inlet (7) by the rotation of the compressor wheel (1). The action of the compressor wheel blades causes a compression of the air/fuel mixture.
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 the coolant passages (8) in the bearing housing. The coolant then leaves the turbocharger at the opposite side of the center section.