© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only  Refers to the cylinder heads, valves, camshaft, and related components.

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© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only  Refers to the cylinder heads, valves, camshaft, and related components  These parts control the flow of air and fuel into the engine cylinders  They also control the flow of exhaust out of the engine

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Cylinder Head Parts When the valve is closed, it seals against the valve seat

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Valve Train Consists of the valves and the parts that operate them

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Valve Train Operation The camshaft lobe turns into the lifter and the valve is pushed open The lobe rotates away from the lifter and the valve spring pushes the valve closed

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Camshaft Located in the engine block or in the cylinder head

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Valves Open and close the ports in the cylinder head

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Intake Valve  Larger than the exhaust valve  Controls the flow of the air-fuel mixture into the cylinder  Controls the flow of exhaust gases out of the cylinder  Smaller than the intake valve Exhaust Valve

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Valve Spring Assembly Used to close the valve

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only Camshaft Drive A belt-drive, chain-drive, or gear-drive may be used to turn the camshaft

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only The End