Join Date: Feb 2010
Location: Narragansett Bay
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Re: Impeller chunks
BTDT. At least, if you have a very identifiable chunk missing, you'll know when you find it. I've had entire impellers let go and you're never sure you found it all. My most catastrophic failure occurred, after I'm certain the boat yard failed to open the intake thru-hull when testing filter changes. Work fine, when I started up, but completely let go 5 minutes off the dock.
If you remain uncomfortable, it can be an excuse to descale, by setting up a circulating pump to push acid backwards through the system. Sort of a dual purpose backflush. I put a submersible pump, with an intake screen, in a 5 gallon bucket and connected it's out flow hose to the back of the heat exchanger and then a return hose on the other end of the circuit (prior to it reaching back to the water pump). I used a couple of gallon of RydLyme descaler and ran it for about an hour. I found a bunch of little debris in the bottom of the bucket, some of which was undissolved scale.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.