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 FUEL SYSTEM
SYSTEMS OPERATION
AIR INLET AND EXHAUST SYSTEM
The components of the air inlet and exhaust
The intake valves close and the piston starts to move up
system control the quality and amount of air avail- able
on the compression stroke. When the piston is near the
for combustion. There is a separate turbocharger and
top of the compression stroke, fuel is injected into the
exhaust manifold on each side of the engine. A common
cylinder. The fuel mixes with the air and combustion
aftercooler is located between the cylinder heads in the
starts. The force of combustion pushes the piston down
center of the engine. The inlet manifold is a series of
on the power stroke. When the piston moves up again it
elbows that connect the aftercooler chamber to the inlet
is on the exhaust stroke. The exhaust valves open and
ports (passages) of the cylinder heads. Two camshafts,
the exhaust gases are pushed through the exhaust port
one in each side of the block, control the movement of
into exhaust manifold (I). After the piston makes the
the valve system components.
exhaust stroke, the exhaust valves close and the cycle
(inlet, compression, power, exhaust) starts again.
Exhaust gases from the exhaust manifold go into the
turbine side of the turbocharger (8) and cause turbine
wheel (6) to turn. The turbine wheel is con- nected to the
shaft that drives compressor wheel (5). The exhaust
gases then go out the exhaust outlet (7) through exhaust
elbow (9).
AIR INLET AND EXHAUST SYSTEM
1. Exhaust manifold. 2. Aftercooler. 3. Engine
cylinder. 4. Air inlet. 5. Turbocharger compressor
wheel. 6. Turbocharger turbine wheel. 7. Exhaust
outlet.
Air flow is the same on both sides of the engine.
AIR SYSTEM COMPONENTS
Clean inlet air from the air cleaners is pulled through air
(3512 Engine Shown)
inlet (4) by compressor wheel (5). The rotation of the
1. Exhaust manifolds. 2. Aftercooler. 8.
compressor wheel causes compression of the air and
Turbochargers. 9. Exhaust elbow. 10. Cylinder
forces it through a tube to aftercooler (2).
The
head.
aftercooler lowers the temperature of the com- pressed
air before it goes into the inlet chambers in each cylinder
head.
This cooled, compressed air fills the inlet
chambers in the cylinder heads. Air flow from the inlet
chamber into the cylinder is controlled by the intake
valves.
There are two intake and two exhaust valves for
each cylinder.
Make reference to Valve System
Components. The intake valves open when the piston
moves down on the inlet stroke. Cooled, compressed air
from the inlet chamber is pulled into the cylinder.
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