Turbocharger — description (Peugeot 305)

1. A turbocharger is installed on the XUD7T and XUD9T engines. It improves engine efficiency by increasing the pressure in the intake manifold above atmospheric pressure. Instead of being sucked into the cylinders, air is forced into them.

2. The turbocharger receives the energy it needs to operate from the exhaust gases as they pass through a specially shaped chamber (turbine chamber) rotate the turbine wheel. The turbine wheel sits on a shaft, at the end of which there is another impeller, known as the compressor wheel. The compressor wheel rotates in its own chamber and compresses the intake air on its way to the intake manifold.

3. Boost pressure (intake manifold pressure) is limited by a wastegate valve that diverts exhaust gases away from the turbine wheel in response to a command from a pressure-sensitive actuator (see photo).

4. The turbine shaft is lubricated under pressure through a tube extending from the lubrication line. The shaft practically "floats" on an oil cushion. The liquid returns to the tray through the drainage tube.