Why?

Because IF the impeller is dryrotted and breaks up, the shrapnel may well
wind up going up the pipe and into the cooling system - where is is bound
(by Murpheys Law) to find the most critical water passage and block it.

Changing the impeller is VERY trivial compared to all the alternatives.

Your sons motor is lucky is all.

-W


"Sunny" wrote in message news:kz%dd.31253

Why?

It's not a trivial job, and IME there's no evidence impellers are harmed
by dry storage.

My son's motor is 40 years old, and still has the original impeller -
despite sitting idle for 15+ years before being returned to service
three years ago.

Paul