420 DA Thread

Discussion in 'Sport Yachts/Yachts' started by Skip, Jan 16, 2007.

  1. copb8tx

    copb8tx Well-Known Member

    Jan 26, 2008
    Lake Texoma, TX
    2005 420 Sundancer
    T-8.1S Horizons
  2. villain style

    villain style Well-Known Member GOLD Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 44 DA
    QSC 8.3s
    Cummins QSC 8.3s 500HO
    Bart - Thanks - Did you replace the Copper crush washer or just reuse it? If you replaced it do you have a P/N?
     
  3. Buyajet

    Buyajet Active Member

    319
    May 28, 2018
    2005 420 DA
    Cummins CTA's 480's
    Thanks Rob
     
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  4. Buyajet

    Buyajet Active Member

    319
    May 28, 2018
    2005 420 DA
    Cummins CTA's 480's
    On the outbound line to the thru hull. Right after it leaves the AC unit
     
  5. Blueone

    Blueone Well-Known Member GOLD Sponsor

    Jan 24, 2007
    Lake Erie, Ohio
    2004 420 Sundancer
    Cummins 6CTA 450's
    I didn't think I could see the thru hull fitting from under the bed

    I cant see the loop doing much for back pressure. The only thing it could be doing is holding water in the line for some reason
     
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  6. Buyajet

    Buyajet Active Member

    319
    May 28, 2018
    2005 420 DA
    Cummins CTA's 480's
    Not sure myself but it is a long way from pump to fwd system. Thanks
     
  7. Jaybeaux

    Jaybeaux Well-Known Member SILVER Sponsor

    737
    Jan 3, 2016
    Upper Potomac River
    420 Sundancer 2004
    Naught On Call
    Cummins 6CTA-8.3's with V-Drives
    9KW Onan Genset
    Take me through the steps:

    1. Get transmission oil a "bit warm" to facilitate removal. A Texas summer may be enough.
    2. Suck old oil out through dip stick port.
    3. Using a 36 mm wrench/socket, (is that the proper size?) remove cleanable filter.
    4. Clean filter and replace, replace crush washer.
    5. Fill with approximately 1 gallon of straight 30 wt oil.

    Is that about right? When you remove the filter/plug, is there still a bunch of oil in there? Oh a scale of 1-10, how much of a PITA is it to reach these suckers?

    I need to do mine this year.

    Jaybeaux
     
  8. copb8tx

    copb8tx Well-Known Member

    Jan 26, 2008
    Lake Texoma, TX
    2005 420 Sundancer
    T-8.1S Horizons
    I replaced it for sure but I'm traveling for work and don't have access to the P/N at the moment. Let me see if I can find it online.
     
  9. ASH

    ASH Member

    222
    Dec 4, 2013
    ia
    Sundancer
    Cummins


    I do mine by myself regularly. Your description is almost perfect....I use a solo cup cut in half to catch the oil that comes out of the filter area, usually only a few tablespoons after you suck the oil out.....I recall using more than 1 gallon per side....I would buy a case of 12 qt. to do the job, I think 5 qt per side. I have never replaced the crush washer and actually have never seen a speck of anything on the filter.... I just stick it back in. I have long arms and the job to me is a snap. The filters are located in a great spot. I would give the job a "3" to finish answering all your questions. One last thing....I don't think a wrench works...You will likely need a socket/ratchet.
     
    Jaybeaux likes this.
  10. villain style

    villain style Well-Known Member GOLD Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 44 DA
    QSC 8.3s
    Cummins QSC 8.3s 500HO
    My trans call for 6.4 qts each.
     
    Jaybeaux likes this.
  11. swaterhouse

    swaterhouse Active Member GOLD Sponsor

    501
    Jan 7, 2015
    Mattapoisett, MA
    2007 Sundancer 44
    Cummins QSC 8.3
    I ground off a bit of my socket to remove the beveled part on the end so I had full contact with the filter, and use a long breaker bar its on there tight!

    The transmission holds a bit over 6 qts, but you'll likely not get it all out so plan on about 5.5 qts per side.
     
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  12. Dillon Frazier

    Dillon Frazier New Member

    1
    Feb 1, 2019
    Fort worth tx
    I just sold my 2010 420 Cruisers yacht. looking for a sea ray 47 SB
    Boatless
    Hello I am looking to find how to replace the front head vent fan. On my 04 42 Sundancer I can’t seam to find where the blower is located. Would you know?
     
  13. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's

    [​IMG]
    Dillon FrazierNew Member
    1
    Feb 1, 2019
    Fort worth tx
    I just sold my 2010 420 Cruisers yacht. looking for a sea ray 47 SB
    Boatless


    HUH?
     
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  14. Blueone

    Blueone Well-Known Member GOLD Sponsor

    Jan 24, 2007
    Lake Erie, Ohio
    2004 420 Sundancer
    Cummins 6CTA 450's
    I don’t have a loop. I also can’t see the thru hull fitting. I go thru another piece of plywood before going out the side.
    C952F254-0D40-4997-86B5-7275D67373C0.jpeg
     
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  15. brewster16

    brewster16 Active Member

    442
    Aug 9, 2009
    Long Beach Island, N.J.
    '07 44 Sundancer
    Twin Cummins QSC 8.3
    I also can't see a loop doing much to create back pressure in the AC discharge. When you say you have to blow it out every couple of weeks, what do you do exactly? And, what do you see when you blow it out? I'm inclined to think there is something else limiting or obscuring outflow. In the beginning of the season I found a magic marker cap in that line which was blocking the AC outflow!

    My suggestion, if you haven't already done it, is to disconnect the discharge line from the Cruisair "outflow" while AC compressor is on. If tons of water blows out (put a big ziplock bag on it) then move on to the outflow hose itself as the culprit. Run a rigid but flexible wire, coat hanger etc. to feel for or clear an object which may be blocking the flow. I guess the answer lays with what you see or feel when you "blow it out every couple of weeks" and what you come up with after following this recommendation. Please let us know......
     
    Buyajet likes this.
  16. Robski97

    Robski97 Well-Known Member GOLD Sponsor

    Jan 15, 2007
    North Bellmore, NY
    44DA
    Cummins QSC 8.3's
    Disconnect the hose while the ac unit is running is going to make a mess ! U can isolate each ac at the manifold in the bilge. I flush my lines regularly with a garden hose. Each unit individually.

    Rob
     
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  17. Buyajet

    Buyajet Active Member

    319
    May 28, 2018
    2005 420 DA
    Cummins CTA's 480's
    Great shot and thanks. Mine is different.
     
  18. Buyajet

    Buyajet Active Member

    319
    May 28, 2018
    2005 420 DA
    Cummins CTA's 480's
    I appreciate the suggestion above. I haven't blown the line from the unit discharge directly from the unit itself like you noted. What I have been doing is what Rob suggested. I take each line off the manifold in the bilge, I fashioned a 5/8" to hose connector attached to a garden hose through about 4 feet of clear tubing. It clears the lines and all of my lines are great until I get to the forward one. I hit the hose and watch all kinds of brown silt crap blow out, but it stayed "restricted" a bit. So... I ran a small 4' cable with a soft plastic edge in the out hole, got a little algae out, it got better but not great. Then I ran Barnacle Buster both ways, waiting a few hours to work from the hose off the manifold. That cleared it up but a week later, my flow in the fwd thru hull becomes crap again so I blow it from the manifold and brown silt comes out making it better. I think this loop I have is collecting crap. Just a best guess so I was wondering whose 420 had this loop thing. This is the greatest forum. Thanks to all.
     
  19. Blueone

    Blueone Well-Known Member GOLD Sponsor

    Jan 24, 2007
    Lake Erie, Ohio
    2004 420 Sundancer
    Cummins 6CTA 450's
    I would be inclined to try it for a while with out the loop.
     
    Buyajet likes this.
  20. Buyajet

    Buyajet Active Member

    319
    May 28, 2018
    2005 420 DA
    Cummins CTA's 480's
    Yup...It is just such a PITA to change the whole line from the unit to the through hull. I'd rather not cut it and splice making another way to sink the boat :) but I may be at that crossroad.
     

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