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On cars that have a timing chain, the water pump is usually mounted on the front of the engine block and is driven by the drive belt. On most cars that have timing belts, the water pump is mounted on the front of the engine as well, but driven by the timing belt and is concealed under the timing belt cover. It is always recommended that the water pump be replaced whenever the timing belt is done because due to variations in timing belt tension, if you reuse the old water pump on a new timing belt, the average life span of the water pump can be measured in weeks. Some folks think that the repair shop is just trying to milk more money out of them, but this is one case where they are right. If you go cheap (and really, the difference in parts is usually after 40-50 USD with about the same amount in additional labor), you will wind up spending the full labor cost of a timing belt job again in a few weeks to replace the pump.
Nissan recommends replacement of the timing belt and water pump at 84 months or 105K miles whichever comes first. ALWAYS replace the water pump at the same time as the timing belt or you will be out the same amount of labor in 2-3 months when the pump goes bad after the timing belt replacement.
It is common practice to replace the water pump when replacing the water pump also. If the timing belt has recently been replaced than it would not be necessary to replace it again. If the belt is original than it makes perfect sense to replace it when the water pump is replaced as the timing belt will need to be removed in order to replace the water pump. There is no additional labor coast just the additional parts cost of the timing belt.
When it is done you shouldn't have to worry about it for the next 100,000 miles or so.
If you don't replace it when you have the water pump replaced than down the road when the timing belt is due for service you will have to pay for all the labor costs again to replace the water pump.
You don't have too, but not bad idea, the timing belt drives the water pump, if you just replace timing belt, and not water pump, water pump could go out and mess up the timing belt, now it has to be done all over again, timing belt, water pump and labor.
Technically, nothing else needs to be changed when replacing a timing belt, however it is recommended or suggested to replace the timing belt tensioner and water pump while doing the belt. These items are only accessable when doing a timing belt. The cost should be under $100.00