3304 & 3306 – Engines With Turbocharger And Aftercooler


1. Air inlet. 2. Compressor wheel housing. 3. Exhaust outlet. 4. Air outlet. 5. Aftercooler housing. 6. Exhaust manifold. 7. Cylinder head. 8. Turbine wheel housing. 9. Exhaust inlet. 10. Air filter. 11. Inlet air pipe for aftercooler.

The air inlet and exhaust system components are: air cleaner, aftercooler, inlet manifold, cylinder head, valves and valve system components, exhaust manifold, and turbocharger.

Clean inlet air from air filter (10) is pulled through air inlet (1) of the turbocharger by the turning compressor wheel. The compressor wheel causes a compression of the air. The air next goes through inlet air pipe (11) to aftercooler housing (5). The aftercooler cools the air. The air then goes to the inlet manifold which is part of cylinder head (7). When the intake valves open, the air goes into the engine cylinder and is mixed with the fuel for combustion. When the exhaust valves open, the exhaust gases go out of the engine cylinder and into exhaust manifold (6). From the exhaust manifold, the exhaust gases go through the blades of the turbine wheel. This causes the turbine wheel and compressor wheel to turn. The exhaust gases then go out exhaust outlet (3) of the turbocharger.

The aftercooler cools the air coming out of the turbocharger before it goes into the inlet manifold. The purpose of this is to make the air going into the combustion chambers more dense. The more dense the air is, the more fuel the engine can burn efficiently. This gives the engine more power.

The turbocharger is installed on the exhaust manifold. The turbocharger is located either at the rear or on top of the engine. All the exhaust gases from the engine go through the turbocharger.

The exhaust gases go through the blades of the turbine wheel. This causes the turbine wheel and compressor wheel to turn which causes a compression of the inlet air.

TURBOCHARGER (Typical Illustration)
1. Air inlet. 2. Compressor housing. 3. Nut. 4. Compressor wheel. 5. Thrust plate. 6. Center housing. 7. Lubrication inlet port. 8. Shroud. 9. Turbine wheel and shaft. 10. Turbine housing. 11. Exhaust outlet. 12. Spacer. 13. Ring. 14. Seal. 15. Collar. 16. Lubrication outlet port. 17. Ring. 18. Bearing. 19. Ring.

When the load on the engine goes up more fuel is put into the engine. This makes more exhaust gases and will cause the turbine and compressor wheels of the turbocharger to turn faster. As the turbocharger turns faster, it gives more inlet air and makes it possible for the engine to burn more fuel and will give the engine more power.

Maximum rpm of the turbocharger is controlled by the fuel setting, the high idle speed setting and the height above seal level at which the engine is operated.

The bearings for the turbocharger use engine oil under pressure for lubrication. The oil comes in through the oil inlet port and goes through passages in the center section for lubrication of the bearings. Oil from the turbocharger goes out through the oil outlet port in the bottom of the center section and goes back to the engine lubricating system.

The fuel system adjustment is done at the factory for a specific engine application. The governor housing and turbocharger are sealed to prevent changes in the adjustment of the fuel setting and the high idle speed setting.

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