electrical system is provided to supply power forstarting the engine and for igniting it during operation.The operation of an internal combustion engine requiresan efficient cooling system. Water-cooled engines use awater pump and fan while air-cooled engines use ablower to force cool air around the engine cylinders.In addition, an exhaust system is provided to carryaway the burned gases exhausted from the enginecylinders. These systems will not be discussed in thiscourse, however. For further information, refer toNAVPERS 10644G-1, Construction Mechanic 3 & 2.SUMMARYThis chapter explained briefly the followingoperational principles and basic mechanisms of theinternal combustion engine:The power of an internal combustion engine comesfrom the burning of a mixture of fuel and air ina small, enclosed space.The movement of the piston from top to bottom iscalled a stroke.To produce sustained power, an engine mustrepeatedly accomplish a definite series ofoperations. This series of events is called acycle.Engine classifications are based on the type of fuelused—gasoline or diesel.Design and size must be considered before engineconstruction.Engines require the use of auxiliary assemblies suchas the fuel pump, the carburetor, and anelectrical system.12-23
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