timing chain
noun
plural timing chains
: a chain that connects the camshaft and the crankshaft in a vehicle engine (such as in an automobile) and coordinates the opening and closing of the engine's valves
Much older vehicles will have a timing chain instead of a timing belt … . Timing chains have a much longer lifespan and generally do not need to be replaced.—Melissa Thompson
… a timing chain is that part of a vehicle's internal combustion engine that drives the cams and operates the valves that feed fuel into the combustion chambers and extracts spent gases from them.—Joey Bernardez
compare timing belt
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Merriam-Webster unabridged
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