valve spring

A small coil spring that closes the valve after it has been opened by the cam, and prevents the valve from bouncing on its seat. The action of the spring keeps the lifter in contact with the cam. If the spring is weak, noise will be generated and the valve, spring, lifter and cam will be subjected to hammer-like blows that cause metal fatigue.
See

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • valve spring — /ˈvælv sprɪŋ/ (say valv spring) noun a helical spring used to close a poppet valve, especially in an internal combustion engine …   Australian English dictionary

  • valve spring retainer — See valve spring cap …   Dictionary of automotive terms

  • valve spring seat — A seat retaining the bottom of the valve spring …   Dictionary of automotive terms

  • valve spring cap — The retaining cap (of intake or exhaust valves) which secures the valve keeper on the valve stem …   Dictionary of automotive terms

  • valve spring collar — The retaining cap (of intake or exhaust valves) which secures the valve keeper on the valve stem …   Dictionary of automotive terms

  • valve spring depressor — A lever type tool used to depress valve springs, e.g., for removal and installation of valve stem seals …   Dictionary of automotive terms

  • valve spring compressor — A special automotive tool used to compress valve springs for removal and replacement; the most common type is a c shaped clamp …   Dictionary of automotive terms

  • valve spring lifter — A pliers type tool with two expanding jaws, used to lift and compress valve springs for removal and replacement …   Dictionary of automotive terms

  • progressively wound valve spring — A valve spring with variable spacing between its coils which helps to improve responsiveness and thus to reduce the load on the valve train …   Dictionary of automotive terms

  • progressive valve spring — A valve spring with variable spacing between its coils which helps to improve responsiveness and thus to reduce the load on the valve train …   Dictionary of automotive terms

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