What are the symptoms of excessive valve clearance?

[VanBradley]

Excessive valve clearance mainly manifests in the following symptoms: 1. If the engine's valve clearance is too large, there will be continuous crisp sounds after starting the engine, which is most noticeable during cold starts. 2. Excessive valve clearance causes delayed opening and early closing of the intake and exhaust valves, shortening the intake and exhaust time, reducing the valve opening angle, altering the normal valve timing, resulting in insufficient engine intake and incomplete exhaust. 3. It also leads to a decrease in engine power, while causing impact and noise between components in the valve train, accelerating wear.