
1) Beam engine 2) Cam-activated lever 3) Cam-valve connector 4) Engine component 5) Engine rod 6) Lever 7) Lever in a steam engine 8) Lever moved by contact 9) Mechanical lever 10) Sliding rod in an engine 11) Valve attachment 12) Valve mover 13) Valve-moving part 14) Valve-moving rod 
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https://www.crosswordclues.com/clue/tappet

1) Cam 
Found on 
https://www.crosswordclues.com/clue/tappet

 A tappet is a projection which imparts a linear motion to some other component within a mechanism. == Beam engines == The term is first recorded as part of the valve gear of Thomas Newcomen`s atmospheric beam engine, a precursor to the steam engine. The first Newcomen engines had manually worked valves, but within a few years, by 1715, this repet....
Found on 
http://en.wikipedia.org/wiki/Tappet

• (n.) 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.
Found on 
http://thinkexist.com/dictionary/meaning/tappet/
 Tap'pet  noun  (Machinery)
Tap'pet  noun  (Machinery) 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.   Tappet motion , 
 a valve motion worked by tappets from a reciprocating part, without an e...
Found on http://www.encyclo.co.uk/webster/T/11
 In engineering, a tappet is a projection within a moving shaft which strikes some other moving piece periodically. In motor car construction the term tappet is applied to a short shaft between the foot of a valve and a cam on the camshaft operating a valve.
In engineering, a tappet is a projection within a moving shaft which strikes some other moving piece periodically. In motor car construction the term tappet is applied to a short shaft between the foot of a valve and a cam on the camshaft operating a valve.
Found on http://www.probertencyclopaedia.com/browse/GT.HTM
 [n] - a lever that is moved in order to tap something else
[n] - a lever that is moved in order to tap something else
Found on http://www.webdictionary.co.uk/definition.php?query=tappet
 A tappet is an arm, collar or cam within a machine which imparts intermittent motion.
A tappet is an arm, collar or cam within a machine which imparts intermittent motion. 
Found on https://www.encyclo.co.uk/local/20687
 noun a lever that is moved in order to tap something else
 noun a lever that is moved in order to tap something else
Found on https://www.encyclo.co.uk/local/20974
 A pivoting actuator that opens and closes cylinder intake and exhaust valves.
A pivoting actuator that opens and closes cylinder intake and exhaust valves.
Found on https://www.encyclo.co.uk/local/22335
  No exact match found.