Timing mark definitions

Timing mark

1) Engine technology
Found on https://www.crosswordclues.com/clue/timing-mark

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Timing mark

A timing mark is an indicator used for setting the timing of the ignition system of an engine, typically found on the crankshaft pulley (as pictured) or the flywheel, being the largest radius rotating at crankshaft speed and therefore the place where marks at one degree intervals will be farthest apart. On older engines it is common to set the ign...
Found on http://en.wikipedia.org/wiki/Timing_mark

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