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It can if the pistons hit the valves while they are open. The timing chain ensures that when the piston is at the op of it's storke the valves are closed. When the chain breaks the cam stops turning allowing the valves to open and close so if the piston is still trying to travel up in the cyclinder with the valves open it will hit them and bend or break them. Also trying to start the engine with the timing change broken can have the exact same result.

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13y ago

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