when you least expect it. Headed for the fuel dock to fill up, on the way back we got an overheat alarm for our starboard engine. Shut 'er down and turned the helm over to the Sicilian while I took a look see. Put my hand on the raw water pump and it was hot. got the boat back to the slip and removed the raw water cover plate to find what was left of an impeller I installed on July 2nd of this year. This is why I carry spares.
The sea cock was open...I'm thinkin' the intake was blocked by something and shut off the flow of sea water to the pump as we were only movin' at one bell to get to the fuel dock a 1/4 of a mile away from the yacht club.