How do you know if Valves need adjusting?

Valves may need adjusting if you notice symptoms such as abnormal engine noise, decreased performance, rough idling, or difficulty starting the engine. Additionally, if the vehicle is experiencing a loss of power or increased fuel consumption, it could indicate that the valves are out of adjustment. A mechanic can perform a valve clearance check to confirm if adjustments are necessary based on specific engine specifications. Regular maintenance schedules often include valve adjustments, especially for certain engine types.