valve tappet

An adjusting screw to obtain the specified clearance at the end of the valve stem (tappet clearance). The screw may be in the top of the lifter, in the rocker arm, or in the case of the ball joint rocker arm, the nut on the mounting stud acts in place of a tappet screw.

Dictionary of automotive terms. 2015.

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  • valve lash — Valve tappet clearance or total clearance in the valve operating train with cam follower on camshaft base circle. Also see valve clearance …   Dictionary of automotive terms

  • tappet — [1] The screw used to adjust the clearance between the valve stem and the lifter or the rocker arm. [2] The valve lifter itself. See barrel tappet bucket tappet cam follower flat tappet hydraulic tappet …   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 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

  • Tappet — Tap pet, n. (Mach.) A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion. G. Francis. [1913 Webster] {Tappet motion}, a valve motion worked by… …   The Collaborative International Dictionary of English

  • Tappet motion — Tappet Tap pet, n. (Mach.) A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion. G. Francis. [1913 Webster] {Tappet motion}, a valve motion worked… …   The Collaborative International Dictionary of English

  • tappet — [tap′it] n. [ TAP1 + ET] a sliding rod in an engine or machine moved by intermittent contact with a cam and used to move another part, as a valve …   English World dictionary

  • Tappet — [ Ford I4 DOHC engine, showing the tappet just under the cam lobe] A tappet in mechanical engineering is a projection which imparts a linear motion to some other component within an assembly. Properly speaking, a tappet is only that part of a… …   Wikipedia

  • valve shim — A calibrated shim used to adjust valve clearance on OHV engines with bucket tappet assembly; for adjustment, a calibrated valve shim is placed or removed from between tappet and cam …   Dictionary of automotive terms

  • Valve timing — In a piston engine, the valve timing is the precise timing of the opening and closing of the valves.In four stroke cycle engines and some two stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the… …   Wikipedia

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