noun
- mechanical parts in an engine that transfer motion from a cam to open and close valves
Usage: automotive; mechanical engineering
Examples
- The mechanic adjusted the tappets to reduce engine noise.
- Worn tappets can cause poor engine performance.
- The tappets need regular maintenance to function properly.
- He replaced the faulty tappets during the engine overhaul.
- The clicking sound indicated that the tappets required adjustment.
- Modern engines often use hydraulic tappets for automatic adjustment.