A/C water pump

Discussion in 'Sport Yachts/Yachts' started by sbmcwilliam, Mar 23, 2020.

  1. sbmcwilliam

    sbmcwilliam Member

    38
    Jan 29, 2017
    Fort Lauderdale
    2006 Sundancer 340
    MerCruiser 8.1
    Does anyone have the water pump model information for replacement. My water pump will not engage after being idle for several months. I cannot locate in the Sea Ray 340 SUNDANCER 2006 Part Manual.

    Thanks....
     
  2. ocgrant

    ocgrant Active Member GOLD Sponsor

    383
    Dec 31, 2006
    Miami / Ft Lauderdale
    H2O Therapy
    2006 Sundancer 48
    Cummins QSC
  3. Creekwood

    Creekwood Well-Known Member GOLD Sponsor

    Apr 26, 2009
    Oakville and Georgian Bay, Ontario
    '97 330 Sundancer, Raymarine C80 suite with radar, Mercury 310 Hypalon w/8hp Yammie 2stk
    2X 454 carbs w/ vDrives
    Have you tried running the boat at speed? Often once they lose their prime, running the boat will help force water into the lines. Happens very spring up here after launch.
     
  4. Stray Cat

    Stray Cat Active Member TECHNICAL Contributor

    Oct 4, 2006
    Pool 10 Guttenberg, IA
    2006 300DA Sundancer
    350 Mags / Bravo III
    What Creekwood said or if you have access, stick a running water garden hose against the overboard discharge through hull fitting. It should prime after + - 20 seconds...presuming your seacock is turned on.
     
  5. dwna1a

    dwna1a Well-Known Member GOLD Sponsor

    Apr 23, 2012
    James River
    88 Weekender 300 "Seahorse"
    Twins 350
    It does sound as if you lost prime on the pump but if you need a replacement it's based on the size of the unit and most were Mach pumps (I think that the correct spelling)
     
  6. Korkie

    Korkie Active Member GOLD Sponsor

    768
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Questions: Is it engaging and not pumping? Or it is just not engaging when it should when you turn on the A/C or heat? It may be gunked up in the wet head from debris, mud, dried out, etc. In this case it will run but not pump. You can do what StrayCat suggested. This will either prime it or the higher water pressure going through will dislodge if stuck and clean any gunk out and fix it. I am a why did this happen person, so i would take the wet head off and inspect. These pumps are magnetic and it doesn't take much to stop the impeller from spinning. The wet head isn't like your motor impeller. If it worked when you put her away last season, I would investigate all possibilities b4 replacing. They ain't cheap. Also, just for kicks, make sure your stat is set to a temp that will cause the pump to engage. As well as check to see that it is getting the 120v at the pump when it should be. Good luck.
     
  7. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Dickson, TN / Chattanooga, TN
    1998 290 Sundancer
    Twin EFI 5.0L w/Alphas
    Kohler 4kW
    Sorry if this was mentioned before...... but check for power at the pump itself.

    It could be some relay in the HVAC that's not telling it to turn on.
     
  8. Mark Searay

    Mark Searay Member

    71
    Nov 10, 2019
    Sydney Australia
    Searay Sundancer 375
    Mercruiser 6.5L x 2
    Funny enough I have the exact same issue.
    I closed the seacock, opened the strainer and it had water in it (on stanby I had a bucket of water)
    I started the airon, pump powered on but didnt suck the water through - water in strainer didnt go down.
    So would putting a hose as stated above help this and is it safe to do?
    Or would you think the pump has died, even though I can hear it?
    Sounds like a similar issue I incurred two days ago
     
  9. Korkie

    Korkie Active Member GOLD Sponsor

    768
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Yes - you can put a hose to the AC exit and back fill the system. Let run for 30 seconds or so. Then retry your system. It sounds like you may have air in the space between the strainer and the pump. This will push it out.
     
    Mark Searay and Chris-380 like this.
  10. Mark Searay

    Mark Searay Member

    71
    Nov 10, 2019
    Sydney Australia
    Searay Sundancer 375
    Mercruiser 6.5L x 2
    the hose between strainer and pump is about 10cm so not sure. I will give it a go next time I’m out.
    appreciate the info. let you all know results

    ps it was working prior the boat being pulled out of the water.
     
  11. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    They’re usually March Pumps even if they have another name on them and the difference in them will be in rated GPH.
    The rated GPH is usually marked on the pump.
    Easiest way to prime them if they don’t self prime with the seacock open:
    With AC off. Remove hose from discharge side of pump for a second or two until water comes out of pump.
    Shove hose back on. Tighten clamps. Turn AC on and you should be good to go.
    My old 300 Sundancer would never self prime for me after going back in the water, even after a ride.
    The AC pump on my current boat always self primes when it goes back in the water.
    No rhyme or reason!
     
    Mark Searay likes this.
  12. TitanTn

    TitanTn Active Member

    353
    Jul 12, 2015
    Chattanooga, TN
    1986 Saltare, 1998 400 Express
    454 direct drive; twin 3116TA
    Another option - the lines between the pump and the rest of the system can get clogged for many different reasons. Disconnect the lines from the pump and put a garden hose fitting so you can run pressurized water through the system. About 30 seconds of water through each line and it should clear out any blockages. I watched mine when my son turned the water on and I got to see the crud come out the discharge thru hull. Once the lines are clear the pump should do fine (as long as it's primed).
     
  13. Mark Searay

    Mark Searay Member

    71
    Nov 10, 2019
    Sydney Australia
    Searay Sundancer 375
    Mercruiser 6.5L x 2
    FIXED Wouldn’t believe it, just took boat out for a run And started working again. You could see there must have been an airlock as water spluttered out before constant stream. Thanks for assistance
     
  14. knot at work

    knot at work Member

    66
    Sep 6, 2014
    Virginia Beach, va
    2001 460 Sundancer, 430 Cummins, Axiom 12", 650 AIS, SH 5500, Sat tv, 10kw Westerbeke.
    450 Cummins
    Page 86-87 of your parts book 1480433 is the part number if you need it.
     
  15. knot at work

    knot at work Member

    66
    Sep 6, 2014
    Virginia Beach, va
    2001 460 Sundancer, 430 Cummins, Axiom 12", 650 AIS, SH 5500, Sat tv, 10kw Westerbeke.
    450 Cummins
    Oops. page 78. Thought it just said water pump. This is the page for the A/C pump.
     
  16. Mark Searay

    Mark Searay Member

    71
    Nov 10, 2019
    Sydney Australia
    Searay Sundancer 375
    Mercruiser 6.5L x 2
    HI
    I posted the same issue on same boat earlier this month.
    It fixed itself by just running boat at speed and break up the air lock.
    To check pump, I went into bilge , turned on air and went to see if I could hear the pump which i couid.
    If the speed didnt fix it the next thing was going to put a hose in the outlet of the air to push the airlock out (if pump is working)
    Comments above are all true to try
     
  17. Mark Searay

    Mark Searay Member

    71
    Nov 10, 2019
    Sydney Australia
    Searay Sundancer 375
    Mercruiser 6.5L x 2

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