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If you mean just the gasket, yes, it is possible and a new gasket will cure it, which requires removal of the pump.

Here's something to consider though; If the water pump is old, or high mileage, check around for the price of a new one anyway, just to see. Some waterpumps are really inexpensive, so if you can get a new one inexpensively, you'd probably save yourself a few bucks, in the long term, if you replaced it now, while the pump is off anyways.

If you mean the shaft seal, yes, in fact, it is the most common cause of water pump failure, and the only repair is a new water pump.

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Q: Can just the seal go bad on a water pump?
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