Thru- hull for Gally sink on a 420AC. How much difficulty.

Discussion in 'Announcements & FAQs' started by Marvin R Pitts, Jun 7, 2021.

  1. Marvin R Pitts

    Marvin R Pitts New Member

    3
    May 16, 2021
    DeLand, FL.
    420AC 2001-2002
    Twin Cummins 6CTA8.3M3 450 HP
    I would like to pull the Gally sink drain from the sump and do a thru hull, how difficult would this be on a 420 AC?
     
  2. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    The high seas
    Pride 2
    Wind
    Well since nobody replied after a week, I’ll be froggy. Dont have that boat, but i installed A/C in a prior boat. Had to make a thru hull discharge for A/C water out the side. It was a lil scary but take measurements from inside to outside. Measure a lot, be sure your discharge isn’t below water line. Take the tiniest drill bit you got and made a very small pilot hole. If its at least a safe space above water line then rock on with the drilling.
     
  3. Marvin R Pitts

    Marvin R Pitts New Member

    3
    May 16, 2021
    DeLand, FL.
    420AC 2001-2002
    Twin Cummins 6CTA8.3M3 450 HP
    Thank you Pirate Lady. Don't understand why nobody responded, except you. Thanks.
     
  4. ZZ13

    ZZ13 Well-Known Member

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    A bunch of us have done it on the 400 Sedan Bridge. Similar hull to your boat but slightly different galley layout. There are pictures and descriptions in the 40 Sedan Bridge thread.
     
  5. ZZ13

    ZZ13 Well-Known Member

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
  6. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    The high seas
    Pride 2
    Wind
    So, how’d it work out?
     
  7. firecadet613

    firecadet613 Well-Known Member

    May 10, 2007
    Indiana
    2007 Four Winns V358
    Twin VP 5.7GXi V-Drive / ZF63s
    Different boat, but I've done it to both my Four Winns 318 and 358.

    Find where you think the perfect spot is on the inside of the hull, then tape a magnet to it. Go outside of the boat with another magnet and line them up. Does that spot still work?

    Be sure it's low enough so the sink still drains properly. Install the new thru hull with LifeCalk. If there's any coring, seal it with epoxy.

    I replaced my shower sump at the same time, so there wasn't an open hose barb needing to be sealed.
     

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