Free maintnace advise from a pro

Discussion in 'Who's Who' started by boatdoc100, Sep 20, 2007.

  1. Sublimetime

    Sublimetime Member

    387
    Oct 22, 2007
    clifton nj
    420 da
    454
    They are fairly easy to change ,that is if your pump is easy to get to. They are located behind the fittings going into and out of the pump. Be sure to remember the orientation of the duckbill when you remove them to be sure you replace in the same direction.(opposite sides of pump have duckbills facing different direction.Pointing in on one side and out on the other)
     
  2. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    There is a third possibility that is more expensive and hopefully will not come into play. The rubber diaphram mechainism that activates the microswitch that causes the pump to cycle. If something has been flushed down the head that is sharp it can damage the rubber (think small hole) and the system starts to cycle for short periods of time that gradually become longer and eventually it will not shut off. The part is a little pricey and the change out is messier than duck bills. Start with the easy stuff.
     
  3. Pirate

    Pirate New Member

    796
    Jun 26, 2007
    Knoxville, TN
    Currently Boatless
    Boatless
    MC- they are are fairly easy (even if unpleasant) to change. I recommend flushing with a lot of water first. It's an initiation of sorts. Have fun.

    As far as cheap - I think they are about $30 for a set, but I can't remember for sure.
     
  4. MC1600

    MC1600 New Member

    304
    Oct 4, 2007
    Wilmington, NC
    It doesn't look like the system has really been used all that much. Heck, when I bought it, the guy had conditioner in the tank, and there's not even a perceivable odor when you open the waste cap topside.

    I haven't had a chance to check the manual on this yet...but I suspect I just:

    1. Shut off power to the pump
    2. Remove hoses going in and coming out of the pump (I presume I should have some towels and a bucket standing by?).
    3. Find and replace the 4 duckbills
    4. Reassemble??
     
  5. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    Yes that is the procedure. However the advice to flush water through the system is very important for "working conditions." Even if it smells very little you will be glad you used lots of water to clean things out. I generally flush until the tank is full and then pump the tank. A bucket and a sponge are good to have on hand as well. It would not hurt to take a digital pic or at least draw a picture of what things look like the first time you do this so you remember if you get interupted while working on this and come back to it later. Once you've done a change out it's a "piece of cake" assuming you have the room to work which can be a whole other story.
     
  6. Nehalennia

    Nehalennia Well-Known Member

    Aug 22, 2007
    Marysville, WA
    2001 310DA twin 350 MAGs, Westerbeke 4.5KW
    Twin 350 MAG V-drives
    take pictures......nothing too graphic though:wow:
     
  7. Four Suns

    Four Suns Head Pot Stirrer TECHNICAL Contributor

    Oct 4, 2006
    Williamsburg, VA
    2003 480 DB
    Zodiac ProJet Dinghy
    Yamaha 110vx WaveRunner
    QSM-11 Diesels
  8. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 8212, 741 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    I just want to clarify this, because I think it could be taken either way.

    The duckbills are installed in the same direction on both sides of the pump: they point "downstream"
     
  9. geriksen

    geriksen New Member GOLD Sponsor

    378
    Jul 24, 2007
    Austin TX
    98 500 Sundancer
    6V92 DDEC Detroits
    Good postings on this one...
    Duckbills are the most likely culprit when you have a "short cycling" vacuflush pump.
    Bowl seals, also cause the same problem. What we usually do is ask if water is staying in the bowl. If the bowl is going dry, then the bowl seal is leaking. If the water is staying in the bowl but the pump is still cycling then change the duckbills. If the duckbills don't fix it then you have a vacum leak somewhere. These can be difficult to find. I remember one where the leak was actually the plastic nipple on the bottom of the toilet itself.
    Took quite a bit of "process of elimination" :) to find that one!
     
  10. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    You got it. The stuff goes through the big holes and out the slits. Can't back up that way.
     
  11. MC1600

    MC1600 New Member

    304
    Oct 4, 2007
    Wilmington, NC
    I have to tell you, you guys are really making this job sound like a lot of fun!? :smt009
     
  12. Hampton

    Hampton Air Defense Dept TECHNICAL Contributor

    Nov 26, 2006
    Panama City, Fl
    2008 44 Sedan Bridge
    Cummins QSC-500's
    Straight Drives
    Conditioner? That could be good, or he may have been trying to fix a leak.

    If it's not actually conditioner, it may have dried the bowl seal out. The tests listed above (holding water) would answer that question.
     
  13. MC1600

    MC1600 New Member

    304
    Oct 4, 2007
    Wilmington, NC
    Gary and others - THANK YOU for your very good explanation on how to get through this job. I just finished it, and it really wasn't that bad at all.

    Now for the bad news...neither the new duckbills or vaseline on the bowl seal fixed my problem.

    So what should I look to next?? Again, when I turn the pump on, it goes on and off in about 10-15 second increments. It appears to be holding water in the bowl, and I am not hearing any air leaks or anything around the pump (shouldn't be either with the teflon tape I used when putting it back together).

    Any other thoughts on what to look at next??
     
  14. Sublimetime

    Sublimetime Member

    387
    Oct 22, 2007
    clifton nj
    420 da
    454
    Wow. If it is cycling every 15 seconds it has to be a pretty substantial leak. You are going to have to inspect every single connection for tightness. Maybe fill a hand sprayer bottle with water and spray all possibilities,water might exagerate a small hiss. This is how I found a leak that was on the botttom side of the bowl to pedestal gasket.Bowl was holding the water but air was leaking underneath. Loosened bowl clamp,twisted bowl, and retightened. When I sprayed it with water you could see the water dissappear from around seal ring.

    hope this helps good luck
     
  15. Hampton

    Hampton Air Defense Dept TECHNICAL Contributor

    Nov 26, 2006
    Panama City, Fl
    2008 44 Sedan Bridge
    Cummins QSC-500's
    Straight Drives
    Just remembering back to a previous post, it sounds like it might be the diaphragm.
     
  16. Four Suns

    Four Suns Head Pot Stirrer TECHNICAL Contributor

    Oct 4, 2006
    Williamsburg, VA
    2003 480 DB
    Zodiac ProJet Dinghy
    Yamaha 110vx WaveRunner
    QSM-11 Diesels
    Assuming you changed all *FOUR* duckbill valves, you now have to find the leak elsewhere. It could be a number of things ranging from a crack in the small tank the pump is mounted on to a loose clamp to a loose or bad PVC fitting on the duckbill valves to a leaking hose to a etc. etc...

    Your boat isn't that old though...

    I would invest in a vacuum gauge and test one section at a time. Look at the bottom of this page:

    http://www.sealandsanitation.com/vacuflush_parts.htm

    I've never used one as my issues are usually from debris going down the system and are easily fixed.
     
  17. MC1600

    MC1600 New Member

    304
    Oct 4, 2007
    Wilmington, NC
    Is that the one on the plunger up top that the motor attaches to, or inside (behind those like 8 bolts that go around the top of the pump?)
     
  18. MC1600

    MC1600 New Member

    304
    Oct 4, 2007
    Wilmington, NC
    Are you sure all these systems have 4? My dealer told me I only had 2 - one on either side of the pump. I'm thinking it might be time to just take the dayum thing in and hope that Passport will cover part of it.
     
  19. Hampton

    Hampton Air Defense Dept TECHNICAL Contributor

    Nov 26, 2006
    Panama City, Fl
    2008 44 Sedan Bridge
    Cummins QSC-500's
    Straight Drives
    I think it's one pair on either side of the pump.
     
  20. Four Suns

    Four Suns Head Pot Stirrer TECHNICAL Contributor

    Oct 4, 2006
    Williamsburg, VA
    2003 480 DB
    Zodiac ProJet Dinghy
    Yamaha 110vx WaveRunner
    QSM-11 Diesels
    I went and looked at the parts manual (the one online at the Sea Ray site) and you have two pumps on top of your tank. One is the overboard discharge pump and one is the vacuum pump for the toilet. Are you sure you changed the duckbills in the right pump? The overboard discharge pump is the one that pumps the sewage overboard and has a single duckbill valve on each side. The vacuum pump for the head, however, has two duckbill valves on each side... If you only had one duckbill valve on each side, you changed the wrong ones (although it didn't hurt) and your problem could still be the duckbill valves on the vacuum tank.

    Go here:

    http://www.searay.com/Archives_Manuals/Sea_Ray_Archives/parts_manuals/2005/2005 260DA.pdf

    And look at page 63 and tell me which pump you changed the valves on.
     
    Last edited: Jan 21, 2008

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