Air Inlet And Exhaust System
(1) Positive crankcase ventilation valves. (2) Air cleaner adapter. (3) Turbocharger. (4) Air inlet pipe. (5) Inlet manifold. (6) Exhaust manifold.
The 3208 Turbocharged Engine has a turbocharger located at the rear of the engine. The exhaust gases from all of the cylinders are used to turn the turbocharger. Air is pulled through the air cleaner and adapter by the turbocharger compressor wheel. The air goes from the turbocharger through air inlet pipe (4) to the inlet manifold in each cylinder head. The air enters the cylinders when the inlet valves open.
The exhaust gases go out of the cylinders and into the exhaust ports when the exhaust valves open. The exhaust then goes through the exhaust manifolds (6) to the turbocharger. The exhaust gases enter the turbocharger turbine housing and cause the turbine wheel to turn. The exhaust gases leave the turbocharger through the exhaust outlet.
There is a positive crankcase ventilation valve on each valve cover. The ventilation valves are connected to the air cleaner adapter on the air inlet side of the turbocharger.
Turbocharger
The turbocharger is located at the rear of the engine. All the exhaust gases from the diesel engine go through the turbocharger.
The exhaust gases enter the turbine housing (3) and go through the blades of turbine wheel (4) causing the turbine wheel and compressor wheel (1) to turn.
When compressor wheel (1) turns, it pulls filtered air from the air cleaner through compressor housing (2) air inlet. The air is put in compression by action of compressor wheel (1) and is pushed to the inlet manifold of the engine.
When the engine load increases, more fuel is injected into the engine cylinders. The volume of exhaust gas increases which causes the turbocharger turbine wheel and compressor impeller to turn faster. The increased rpm of the impeller increases the quantity of inlet air. As the turbocharger provides additional inlet air, more fuel can be burned. This results in more horsepower from the engine.
Maximum rpm of the turbocharger is controlled by the fuel setting, the high idle speed setting and the height above sea level at which the engine is operated.
The bearings for the turbocharger use engine oil for lubrication. The oil comes in through the lubrication inlet passage (5) and goes through passages in the center section for lubrication of the bearings. Oil from the turbocharger goes out through the lubrication outlet passage (6) in the bottom of the center section and goes back to the engine oil pan.
Turbocharger
(1) Compressor wheel. (2) Compressor housing. (3) Turbine housing. (4) Turbine wheel. (5) Lubrication inlet passage. (6) Lubrication outlet passage.
Turbocharger
(1) Compressor wheel. (2) Compressor housing. (3) Turbine housing. (4) Turbine wheel. (5) Lubrication inlet passage. (6) Lubrication outlet passage.