Re: Outboard water pumps
IIRC, the pump should just be whenever it breaks. The impeller on the other hand should be changed every other year. The vanes start to warp. I guess it should be every year if you put on a good bit of hours in a season. It's still not a cheap thing to have done, but it's better to spend the money for an ounce of prevention than to have tthe motor overheat and seize because the cooling system failed.
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