THEORY OF OPERATION
ENGINE SYSTEMS (Continued)
Fuel System (Continued)
Fuel tanks, which store the fuel
Fuel transfer pumps, which move fuel from the tanks to the fuel injection pump
Fuel filters, which help keep the fuel clean
Fuel injection pump, which times, meters, and pressurizes fuel delivered to the fuel nozzles
Fuel injection nozzles, which atomizes and injects fuel into the cylinders.
The function of the intake system is to supply the engine with the proper amount of clean air at
the proper temperature for good combustion.
The four components of the intake system are:
Air cleaners -The air cleaners prevent dust and dirt from entering the combustion chamber
and damaging the engine.
Turbosuperchargers - The turbosuperchargers are driven by exhaust gases and compress
more air into the cylinders than would be possible through natural aspiration.
increases engine horsepower.
Intake manifolds - The intake manifolds conduct the air to the intake valves of the engine.
The intake manifolds also have heaters in them to help start the engine in cold weather.
Intake valves - The intake valves allow entry of combustion air into the cylinders.
The exhaust system performs three functions, it:
Removes heat from the engine.
Provides power to drive the turbosupercharger.
Carries exhaust gases from the cylinders to the atmosphere via the exhaust valves and the
The electrical system provides three functions:
Battery power to crank the engine.
Electricity from the generator to operate the various accessories when the engine is
Controls and monitors engine operation through various sensors.
The function of the cooling system is to carry away heat generated by engine combustion.
major components of the cooling system are:
Oil coolers (heat exchangers).
Cylinder cooling fins.
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