The Mechanisms designed to smoothly transfer the rotational motion of a crankshaft to the camshaft(s) at one-half of engine speed. There are three types: timing gears, a timing chain and sprockets, or a timing belt and pulleys are called

Metal plates shaped to prevent chain slap on long lengths of chain. Guides have a metal body with a plastic, nylon, or Teflon face, allowing a chain to slide with minimum wear. These are called

Definition: Spring-loaded or hydraulic device that pushes on the unloaded side of a chain to keep it tight and remove excess slack in the chain

Definition: A thin, stamped steel or cast aluminum cover that encloses the timing chain or gear mechanism. It blocks dirt and debris while preventing oil leakage.