noun
- a mechanical part in an engine that transfers motion from a cam to open and close valves
Usage: automotive; mechanical engineering
Examples
- The mechanic replaced the worn tappet to fix the engine noise.
- A faulty tappet can cause poor engine performance.
- The tappet rides on the cam lobe to operate the valve.
- Modern engines use hydraulic tappets for quieter operation.
- The clicking sound indicated a loose tappet adjustment.
- Each cylinder has multiple tappets for intake and exhaust valves.