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. 2015.

Look at other dictionaries:

  • valve clearance — In a reciprocating engine, the clearance between the end of a valve head and a rocker arm when the valve is seated …   Aviation dictionary

  • valve clearance depression — A recess in the piston crown …   Dictionary of automotive terms

  • 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

  • clearance — n. act of clearing away 1) slum clearance authorization 2) to give; receive clearance for 3) customs clearance 4) clearance to + inf. (the control tower gave the pilot clearance to land) space between parts 5) valve clearance certification of… …   Combinatory dictionary

  • clearance — A given amount of space between two parts such as between piston and cylinder, bearing and journal , etc. Also see bearing clearance front wheel tire clearance ground clearance control ground clearance lateral clearance lateral tire cl …   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 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

  • clearance depression — See valve clearance depression …   Dictionary of automotive terms

  • valve adjusting screw — A screw at the end of a rocker which bears on a pushrod; used to tilt the rocker and thus adjust the valve clearance …   Dictionary of automotive terms

  • Clearance — Clear ance (kl[=e]r ans), n. 1. The act of clearing; as, to make a thorough clearance. [1913 Webster] 2. A certificate that a ship or vessel has been cleared at the customhouse; permission to sail. [1913 Webster] Every ship was subject to seizure …   The Collaborative International Dictionary of English

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