Assertion: engine's camshaft | /r/CapableOf | drop tappet
Facets:
Source sentences:
text: Over time, as engine oil starts to gather dirt and increase in viscosity, the interaction between the camshaft and tappets begins to wear down both components to a point where an audible noise can be heard between them as the camshaft spins and the lobes lift and then drop the tappets.