Engine Turbocharger Operation The turbocharger, which is basically an air pump that is driven by exhaust gases, allows the engine to produce added power without increasing displacement. Turbochargers are specially matched for the power ratio requirements of each specific application. TX1001792 –UN–03JAN06 The turbine wheel is driven by th hot engine exhaust gasses. These gases flowing through the turbine housing act on the turbine wheel, causing the shaft to turn. Attached to the shaft is the compressor wheel, which brings in filtered air and discharges the compressed air to the intake manifold, where it is delivered to the engine cylinders.
1—Compressor Housing 2—Shaft 3—Turbine 4—Turbine Wheel 5—Compressor Wheel Engine oil under pressure from the engine lubrication system is applied to lubricate and cool the shaft and bearings in the center housing. Continued on next page JC89288,000019F –19–30JAN06–1/2 TM2361 (24JUN08) 9010-05-13 450DLC Excavator Operation and Tests 062608 PN=261 Theory of Operation 1—Air Filter Housing 3—Exhaust Manifold 5—Muffler 7—Turbocharger 2—Intake Manifold 4—Air-to-Air Intercooler 6—EGR System Engine suction draws dust-laden outside air through an expelled out of the exhaust manifold (3), drives the air inlet stack into the air filter housing (1).
Air is turbocharger turbine (6) which drives the turbocharger filtered through dry-type primary and final filter (7), causing boost pressure to build inside of the intake elements in the air filter housing. Clean air travels tract. This enables the engine to produce more power through the intake air hose to the turbocharger (7), than in normally aspirated form. The air-to-air through the air-to-air intercooler (4), and into the intake intercooler (4) cools the turbocharger compressor manifold (2) along with some exhaust gas that is discharge air by routing it through a heat exchanger recirculated by the EGR system (6) and mixed into the before it enters the engine.
The heat exchanger uses intake manifold. The rest of the exhaust, as it is air flow produced by the fan to cool the charge air. JC89288,000003F –19–30JAN06–2/2 9010 05 13