valvetrain
Engine breathing mechanism
The valvetrain is the system of components that opens and closes the valves in an internal combustion engine.
It typically includes the camshaft, pushrods, rocker arms, and lifters—everything between the crankshaft and the valves themselves.
Engine enthusiasts discuss valvetrain upgrades or noise: The valvetrain was making a ticking sound at idle.
Lobed rod operating valves
- rocker armPivoting engine lever
- pushrodEngine valve linkage component
- tappetCam-actuated engine lever
- lifterOne who raises things
retainer · keeper · stem · seal · shim · bucket · adjuster · actuator
Aligning timing across systems
- timing chainEngine valve synchronization belt alternative
- timing beltEngine valve regulator
- durationLength of existence
- overlapPartial coincidence of coverage
advance · retard · dwell · firing order · TDC
Rate of mechanical work
Willingness to accept difference
- clearancePermitted passage or approval
- feeler gaugeTool measuring small gaps
- micrometerMillionth of a meter
- preloadInstall in advance
camshaft
Lobed rod operating valves
- rocker armPivoting engine lever
- pushrodEngine valve linkage component
- tappetCam-actuated engine lever
lifter · retainer · keeper · stem · seal · shim · bucket · adjuster · actuator · collet
synchronization
Aligning timing across systems
- timing chainEngine valve synchronization belt alternative
- timing beltEngine valve regulator
- durationLength of existence
horsepower
Rate of mechanical work
tolerance
Willingness to accept difference
- clearancePermitted passage or approval
- feeler gaugeTool measuring small gaps
- micrometerMillionth of a meter
- engine partspiston, cylinder, crankshaft, camshaft, spark plug
- valvetraincamshaft, camshafts, rocker arm, rocker arms, pushrod
- enginesdiesel engine, gasoline engine, car engine, truck engine, piston engine