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The water pump is usually changed because it’s found to be leaking when the mechanic strips the front cover off the engine to replace the belt. It’s not a regular service item as such, but done because it’s cheaper to do it at the same time the belt is done rather than leave it and have to replace it at a later date. The failure of a water pump is different to that of the belt, it’s usually due to leakage, which doesn’t result in catastrophic internal damage like a belt failure does.
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