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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE [SKYACTIV-G 2.0]

Purpose, Function

Valve

  • The intake valve is pressed down by the cam, the intake air passage is opened, and air is introduced into the cylinder.

  • The exhaust valve is pressed down by the cam, the exhaust air passage is opened, and combustion gas is exhausted from the cylinder.

Valve spring

  • The valve adheres to the valve seat by the valve spring pulling up the valve by spring force. As a result, the air seal in the combustion chamber is maintained.

Valve seal

  • The valve seal prevents engine oil from entering combustion chamber through the valve guide, and engine oil consumption is suppressed.

Valve guide

  • The valve guide maintains the valve stem to open and close the valve smoothly.

  • The valve guide cools the valve by transmitting valve heat to the cylinder head.

Construction

  • The valve, valve spring, valve seal, and valve guide are assembled to the cylinder head.

  • The sliding resistance has been reduced by setting the valve spring load to the required minimum.

  • The intake valve and exhaust valve are subjected to a nitriding treatment to enhance wear resistance.

  • An unequal pitch valve spring has been adopted. In addition, the upper diameter is smaller compared to the bottom diameter.

  • The valve guide is made of sintered alloy with excellent wear resistance.

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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