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Engine valves regulate the flow of air and fuel into the combustion chamber and allow exhaust gases to exit, facilitating the combustion process.

Intake valves allow the air-fuel mixture into the combustion chamber, while exhaust valves let burnt gases exit. They differ in size, material, and heat resistance.

Common causes include wear and tear, overheating, improper maintenance, and timing belt or chain failures leading to valve-piston collisions.

Individual valves can be replaced if only one is damaged. However, assessing all valves during service is advisable to ensure overall engine health.