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A/C raw water pump cavitating

Discussion in 'Catalina 310' started by Frank H, Apr 23, 2018. Add this thread to a FAQ

  1. Frank H

    Frank H

    Joined May 22, 2017
    26 posts, 2 likes
    Catalina 310
    US Lake Carlyle
    Hello Mates. Every time I clean the A/C raw water pump filter, the pump cavitates. I tried filling the filter housing with water before re-adding, but it didn't help. I have to remove the output hose and turn on pump to let water flow to stop cavitating. A previous post in a different forum showed a valve and hose fittings to add to the output of the pump but I can't find the post now. Opening the valve momentarily would eliminate removing the hose from the pump. Other boats in my marina have this problem also. I'm thinking someone on this forum has added a valve and can inform me what valve and fittings to buy. I believe the ID of the hose is 1/2 inch.
     


  2. JK_Boston_Catalina310

    JK_Boston_Catalina310

    Joined Nov 18, 2010
    1,954 posts, 79 likes
    Catalina 310
    US Hingham, MA
    Hey Frank,

    Just so you know, the AC wasn't installed by Catalina but rather a dealer or someone after. So you might get better results posting in the all sailors section of the forum.

    Good luck and fair winds
     


  3. Frank H

    Frank H

    Joined May 22, 2017
    26 posts, 2 likes
    Catalina 310
    US Lake Carlyle
    I will after I see if anyone on the this forum has added the valve to resolve the problem.
     


  4. justsomeguy

    justsomeguy

    Joined Feb 20, 2011
    6,351 posts, 831 likes
    Island Packet 35
    US Tucson, AZ/San Carlos, MX
    Sounds like the pump isn't installed below the waterline, or there's a bit of "fall" in the supply hose?
    Supply hose should be in a constant ascent to the pump.
     


  5. Frank H

    Frank H

    Joined May 22, 2017
    26 posts, 2 likes
    Catalina 310
    US Lake Carlyle
    Pump is installed below water line. Filter housing immediately fills after it is reinstalled but it only takes a little air in filter to get pump cavitating. Once pump gets water flowing it is fine until filter needs cleaning, usually every two months on our fertile brown water lake.
     


  6. justsomeguy

    justsomeguy

    Joined Feb 20, 2011
    6,351 posts, 831 likes
    Island Packet 35
    US Tucson, AZ/San Carlos, MX
    Is the pump's outflow oriented straight up?
     



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