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When a timing belt breaks, the timing of the valves' movement is no longer synchronized with the crankshaft (and the movement of the pistons).

On most engines, if the valves open when the piston moves upward, the valve and piston hit each other, which can break off the valve, allowing it to cause more damage to the engine. These types of engines are called 'interface' types.

However, on some engines, the valves don't open far enough, and the pistons don't come up high enough for the two to come into contact. So when a timing belt breaks on these engines, the engine stops running, but no internal damage is done. These are called 'non-interface' engines.

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Q: Does a broken timing belt ruin the engine?
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