ENGINE COMPONENT AND LOCATION 109 Air Intake System Fresh air enters the intake above the back of the cab. Plastic duct work leads the air to the filter assembly mounted on the bulkhead under the hood. An impregnated paper filter prevents foreign particles from passing through. The assembly design permits the addition of a second filter if needed in extreme environments. A combination pressure/temperature sensor mounted on the pipe between the filter housing and the turbocharger alerts the driver if the filters need replacement prior to the schedule service. The brake system air compressor also draws fresh, clean air from this same page.
Variable Geometry Turbocharger W2033362 The engine is equipped with a variable geometry turbocharger. The turbine housing has a set of vanes and a sliding nozzle ring that maintains sufficient back pressure in the exhaust manifold for proper operation of the EGR system. A certain amount of back pressure is required to push the exhaust gases into the pressurized intake air at the EGR mixer.