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Components

    The basic parts of engine are shown in Fig. 3. 1.

    .block - main supporting member of engine to hold all the other engine partsin place

    .cylinder - a round hole machined in the block,which guides piston movement

    .piston - a cylindrical component that transfers the energy of combustion to theconnecting rod

    .rings - seal the small gap around the side of the piston, to keep combustionpressure and oil from leaking between the piston and the cylinder wall

    .connecting rod - links the piston to the crankshaft

    .crankshaft - changes the reciprocating movement of piston and rod into usefulrotary motion

    .cylinder head - covers and seals the top of the cylinder, and also holds thevalves,rocker arms,and camshaft

    .combustion chamber - a small cavity between the top of the piston and the bottomof the cylinder head,where the burning of the air-fuel mixture occurs

    .valves - control the flow of air-fuel mixture into the combustion chamber andexhaust gases out of the combustion chamber, through opening and closing

    .camshaft - controls the opening of the valves

    .valve springs - keep the valves closed when they do not need to be openrocker arms一transfer camshaft action to the valves

    .lifters or followers - ride on the camshaft and transfer motion to the other partsof the valve train

    .flywheel - helps keep the crankshaft turning smoothly,and provides a large gearfor the starting motor

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