LONG BLOCK 10R9068 - Caterpillar

Illustration 1 g01122516
Air flow through the engine
(1) Exhaust outlet
(2) Air inlet
(3) Turbocharger
(4) Air cleaner
(5) Exhaust manifold
(6) Exhaust valves
(7) Inlet valves
(8) Sea water inlet to aftercooler
(9) Sea water outlet from aftercooler
(10) Aftercooler
(11) Cylinder headClean inlet air from the air cleaner (4) is pulled through the air inlet of the turbocharger (3) by the turning of the compressor wheel. The compressor wheel causes a compression of the air. The turbocharger compresses the inlet air so that a larger volume of air can be drawn into the cylinders. This compressing of the inlet air is referred to as boost. The compression of the inlet air causes the temperature of the air to increase. The air then flows to the aftercooler (10). The aftercooler utilized cool sea water to cool the inlet air. Cooling of the inlet air causes the air to become more dense. This increases the combustion efficiency and the horsepower output of the engine. The air then flows from the aftercooler to the inlet manifold of the engine. When the inlet valves (7) open, the air flows into the engine cylinders. The air is mixed with the fuel for combustion. When the exhaust valve opens (6), the exhaust gases go out of the engine cylinders and into exhaust manifold (5). From the exhaust manifold, the exhaust gases flow through the blades of the turbine wheel in the turbocharger (3). This action causes the turbine wheel to spin. The exhaust gases then flow out of exhaust outlet (1) of the turbocharger.Turbocharger
Two turbochargers are mounted on the rear of the engine. All the exhaust gas from the left exhaust manifold goes through the left turbocharger, and the right turbocharger uses the exhaust from the right exhaust manifold.
Illustration 2 g01385582
Turbocharger
(12) Air inlet
(13) Compressor housing
(14) Compressor wheel
(15) Bearing
(16) Oil Inlet port
(17) Bearing
(18) Turbine housing
(19) Turbine wheel
(20) Exhaust outlet
(21) Oil outlet port
(22) Exhaust inletAll the air that enters the engine passes through the turbocharger. All the exhaust gases from the engine pass through the turbocharger.The exhaust gases enter turbine housing (18) through exhaust inlet (22). The exhaust gas pushes the blades of the turbine wheel (19). The turbine wheel is connected by a shaft to the compressor wheel (14).Air that passes through the air filters enters the compressor housing air inlet (12) by the rotation of compressor wheel (14). The compressor wheel causes the inlet air to be pushed into the inlet side of the engine. Boost pressure is caused when the compressor wheel pushes more air into the inlet side of the engine. This results in an inlet manifold pressure that exceeds atmospheric pressure. This allows the engine to burn more fuel. When the engine burns more fuel the engine produces more power.When the throttle is opened, more fuel is injected into the cylinders. The combustion of this additional fuel produces greater exhaust temperature. The additional exhaust temperature causes the turbine and the compressor wheels of the turbocharger to turn faster. As the compressor wheel turns faster, more air is forced into the cylinders. The