Re: [Amel Yacht Owners] Raw water cooling
Patrick McAneny
Bill , I agree , if all the blades are intact one assumes all is good. I had a problem on a previous boat where the plate on the pump behind the impeller wore as well as the cover plate diminishing efficiency .
Pat SM#123
-----Original Message----- From: 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] To: amelyachtowners <amelyachtowners@...> Sent: Sat, Apr 1, 2017 9:44 am Subject: Re: [Amel Yacht Owners] Raw water cooling Pat,
When you change the impeller, closely compare the old one to the new one. I believe that you will probably find the same thing I have with wear at the ends of the blades. Once I found what appeared to be a 45° angle cut at the end of used impeller blades, with all of the thickened ends of the blades worn off. It was wear.
I am aware of the rubber separating from the metal hub with low hour impellers which are left in place for over a year. This causes the rubber to slip on the hub, reducing water flow.
I think most of us consider only missing blades as an indication of failure. Best,
CW Bill Rouse Admiral, Texas Navy Commander Emeritus Galveston Island Sent using Google Fi +1(832) 380-4970 On Apr 1, 2017 07:56, "Patrick Mcaneny sailw32@... [amelyachtowners]" <amelyachtowners@...> wrote:
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