Turbocharger - Diesel: Description
The diesel turbocharged engine (617.95) is basically the same design as the naturally aspirated diesel engine. See Fig 1 . Installation of the Garrett turbocharger produced an increase to 110 SAE net brake horsepower at 4200 RPM.
The increased power output required modifications of the crankcase, pistons, valve train, lubrication system, cooling system, and fuel injection system.
The turbocharger delivers compressed air to the engine, providing higher pressures and temperatures in the combustion chambers. The turbocharger consists of a turbine, compressor, and wastegate that prevents excessive boost pressures from damaging the engine. See Fig 2 .
The turbocharger's turbine wheel and compressor wheel are mounted on a common shaft and turn at the same speed. The turbocharger is mounted between the exhaust manifold and the exhaust pipe and is connected directly to the engine for lubrication and cooling. The wastegate is attached to the turbine housing. Should its boost pressure control valve malfunction, an engine overload protection system will prevent engine damage.