13/02/2026
Why Tappet Clearance Is Important
Tappet clearance (valve lash) is the small gap between the rocker arm and valve stem that compensates for thermal expansion of engine components during operation.
Too little clearance:
Valves may not fully close → loss of compression, overheating, valve burning, and power reduction.
Too much clearance:
Causes valve train noise, delayed valve opening, reduced engine efficiency, and increased wear on camshaft and rocker components.
Correct tappet clearance ensures:
✔ Proper valve timing
✔ Full sealing of combustion chamber
✔ Smooth engine performance
✔ Longer valve train life
Tappet clearance protects the engine from heat expansion damage while maintaining accurate valve timing and efficiency.
