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Onan 8kw not pulling raw water through P42

Discussion in 'Big Boats' started by Puesta del sol, Aug 28, 2017. Add this thread to a FAQ

  1. Puesta del sol

    Puesta del sol

    Joined Jan 1, 2014
    109 posts, 7 likes
    Hunter 42
    US Chesapeake
    Checked the strainer and made sure water was coming up thru hull.

    Took intake hose off just as it enters impeller. Poured water down tube - did not back up so must be going out the bottom.

    Started and looked inside entry to impeller. Impeller spinning.

    What else should I be checking?
     


  2. kloudie1

    kloudie1

    Joined Nov 6, 2006
    7,370 posts, 300 likes
    Hunter 34
    US Mandeville Louisiana
    Connection of hose to pump must be absolutely air tight.. Pump cover gasket must be air tight and thin enough that the impeller lightly touches the cover and the back of the case.. Outlet hose must be free of blockage through the exchanger and exhaust elbow.
     


  3. Puesta del sol

    Puesta del sol

    Joined Jan 1, 2014
    109 posts, 7 likes
    Hunter 42
    US Chesapeake
    It was working fine a month ago. Could the impeller be an issue?

    Will check hoses and exhaust see if there is a blockage.
     


  4. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    923 posts, 190 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    Check that the cover is nice and flat. Also pull output hose and see if is obstructed by blowing on it (yumm)
    Les
     



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