If the pulley wobbles or coolant is leaking out, it's time to change the pump. Or, if you have a vehicle with a timing belt and it's time to change the timing belt, you may actually save money in the long run if you change the pump at the same time since most of the labor is already done with the belt change.
the water pump is part of the timing belt or chain. you have to take the belt or chain off to change the water pump. if you change the water pump, change the belt too.
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no you do not have to change the timing chain when changing the water pump.
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