valve lifter

[1] The cylindrically shaped component that presses against the lobe of a camshaft and moves up and down as the cam lobe rotates. Most valve lifters have an oil-lubricated hardened face that slides on the cam lobe. So-called "roller lifters," however, have a small roller in contact with the cam lobe -- thereby reducing the friction between the cam lobe and the lifter. Also called "valve follower" or cam follower.
[2] A tool that compresses valve springs for removal and replacement. Also see hydraulic valve lifter

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • valve lifter — noun : a device used especially in the internal combustion engine for opening the valve of a cylinder * * * Auto., Mach. (in an internal combustion engine) a tappet that opens a valve when actuated by a camshaft …   Useful english dictionary

  • valve lifter — Auto., Mach. (in an internal combustion engine) a tappet that opens a valve when actuated by a camshaft. * * * …   Universalium

  • hydraulic valve lifter — A lifter that uses hydraulic oil pressure to maintain no clearance between metal parts so that valve noise is reduced. Also it reduces wear on the valves and eliminates periodic valve adjustments …   Dictionary of automotive terms

  • lifter — also See hydraulic lifter hydraulic valve lifter piston lifter roller lifter roller tappets tappets valve lifter valve spring lifter …   Dictionary of automotive terms

  • valve — A device used to either open or close an opening to allow or prevent the flow of a liquid or gas from one place to another. There are many different types. See ABS relay valve accumultor valve air valve carburetor air control valve air gulp valve …   Dictionary of automotive terms

  • valve clearance — The distance between the small end of the valve stem and the rocker arm or valve lifter. This gap is necessary to compensate for expansion due to heat. Also called valve lash …   Dictionary of automotive terms

  • valve follower — See valve lifter …   Dictionary of automotive terms

  • Valve float — is an adverse condition which occurs when the poppet valves on an internal combustion engine valvetrain do not remain in contact with the camshaft lobe during the valve closure phase of the cam lobe profile. This reduces engine efficiency and… …   Wikipedia

  • Lifter — can mean: * Ionocraft, a device that can generate thrust using ionised air with no moving parts * Tappet, part of an internal combustion engine that actuates a poppet valve through rocker arms and pushrods * Spatula …   Wikipedia

  • 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 …   Dictionary of automotive terms

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