The intake air system consists of intake air piping, turbocharger, charge air cooler (CAC) piping, and CAC.
The turbocharger uses exhaust gas energy to turn the turbine wheel. The turbine wheel drives the compressor
impeller which provides pressurized air to the engine for combustion. The additional air provided by the turbo-
charger allows more fuel to be injected to increase the power output from the engine.
NOTE: The correct turbocharger must be used. Providing too much additional air will increase the cylinder pressures
and shorten the life of the engine.
The turbine and compressor wheels and the shaft are supported by two rotating bearings in the bearing hous-
ing. Passages in the bearing housing direct filtered, pressurized engine oil to the shaft bearings and thrust bear-
ings. The oil is used to lubricate and cool the rotating components to provide for smooth operation. The oil then
drains from the bearing housing to the engine sump through the oil drain line.
NOTE: An adequate supply of good, filtered oil is very important to the life of the turbocharger.
As the intake air is compressed by the turbocharger, the air is heated. This heated air is then passed through the
charge air cooler which cools the air. Because cool air is more dense than warm air, more air can be compressed
into the cylinder, yielding a much greater combustion efficiency.
