Valve shim

Valve shim

A valve shim is a disc of hardened metal of precisely calibrated height used to adjust the clearance (US:lash) between a cam-lobe and the valve on which it operates where the cam-lobe operates directly on the valve without an intermediate rocker arm. The shim sits atop a shim bucket which itself sits atop the valve-stem and moves up and down within a machined bore. In situations where valve-train weight reduction is important top-hat shims are used as an alternative.


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • 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 shim pliers — A special automotive tool for the removal and installation of valve shims …   Dictionary of automotive terms

  • shim — A thin spacer installed between two parts to increase the distance between them. See adjusting shim anti squeal shim valve shim …   Dictionary of automotive terms

  • shim pliers — See valve shim pliers …   Dictionary of automotive terms

  • Shim (engineering) — In engineering, a shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects. Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be… …   Wikipedia

  • shim under bucket — A valve adjusting system where the valve clearance is adjusted by placing an appropriate thickness of shim under the tappet instead of using an adjusting screw …   Dictionary of automotive terms

  • Top-hat shim — A top hat shim (lash cap US) is a small inverted hardened metal cup placed atop a valve stem. Varying thicknesses of top hat shims are used to adjust valve clearances in a similar fashion to standard flat disc shims (as used in Fiat SOHC/DOHC,… …   Wikipedia

  • Ileocecal valve — Interior of the cecum and lower end of ascending colon, showing colic valve. ( Colic valve is an older term for the ileocecal valve.) …   Wikipedia

  • pliers — A gripping tool with two hinged arms and serrated jaws. See action locking pliers angle nose pliers bending pliers circlip pliers clamp pliers clip pliers combination pliers crimping pliers end cutting pliers …   Dictionary of automotive terms

  • Imagerie par résonance magnétique — Pour les articles homonymes, voir IRM et MRI. L imagerie par résonance magnétique (IRM) est une technique d imagerie médicale permettant d obtenir des vues 2D ou 3D de l intérieur du corps de façon non invasive avec une résolution relativement… …   Wikipédia en Français

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”