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I don't know how often I change my impeller -- I used to do it once a year
when I was laying my boat up for the winter but now that I take it from
MA to FL, which is about 300 hours of motoring, that interval is much
longer.
I'll change it if I change the antifreeze in the engine at about 1,200 hours
or if the pump shaft seals corrode and go adrift in the pump (in which case
I replace the whole pump as the main chamber is worn out a bit at that
point).
I've never had an impeller fail on me so haven't set up a replacement
schedule for one. Maybe Don can chime in here.
-jonathan
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