Description & Operation: Notes

The turbocharger is used on Jeep 2.1L turbo diesel engines to improve fuel efficiency and increase engine performance. Turbocharger assembly is mounted on exhaust manifold, and consists of a turbine, compressor, oil supply system, pressure relief valve, wastegate actuator and wastegate valve.

Fig 1: View of Jeep 2.1L Diesel Turbocharger

Courtesy of AMERICAN MOTORS/JEEP CORP.

Fig 2: Sectional View of Turbocharger System

The turbocharger turbine wheel is driven by exhaust gas flowing from the engine. See Fig 2 . The turbine rotates a shaft attached to the compressor wheel. The compressor wheel takes in fresh air from the air cleaner and compresses it.

The compressed air is then boosted and supplied to the intake manifold. Once maximum boost is attained, the wastegate actuator opens the turbine side of the turbocharger. The excess boosted pressure is released into the exhaust system below the turbocharger.

A pressure relief valve is attached to the intake manifold as a backup for the wastegate. If the wastegate becomes inoperative, the boosted pressure will exceed a preset level and may cause damage. The relief valve will open when the pressure preset level is exceeded, expelling excessive inlet pressure into the atmosphere.