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I need shaft coupling info plz

Discussion in 'Engines and Propulsion' started by Justin_NSA, Mar 10, 2018. Add this thread to a FAQ

  1. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    OMG, this dripless shaft seal project is a nightmare! I need to go to a split coupling because of the lack of clearance and working room on the shaft. I've already dropped the rudder so I could remove the shaft to get it fit and faired to the new coupling when I get it.
    I need help identifying the part I need. I have a '91 Hunter 30T with a 2GM20F diesel. I don't know who makes the tranny. The coupling has 4 bolt holes, fits a 1" keyed shaft and has a 4"flange. Anyone have an idea what I need? Go2Marine carries Buck Algonquin split shafts. They are closed until Monday..
     


  2. Tally Ho

    Tally Ho

    Joined Jan 7, 2011
    970 posts, 122 likes
    Oday 322
    US East Chicago, IN
    if you scroll down to the Yanmar section of this chart, you will find the part numbers for a 4-bolt coupling...either in the solid or split version.
    https://www.go2marine.com/docs/mfr/BuckAlgonquin/Transmission_Manufacturer.pdf
    It does look like the split coupling is a little shorter than the solid one.

    My O’Day 322 has a Yanmar 2GM20F engine and a Kanzaki Tranny.
    F3F40D41-81A3-4534-87AE-DFEF67330B8C.jpeg

    Good luck with your project.

    Greg
     


  3. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Thanks Greg. I've read their info and I think I know which one I should order. I need to confirm it. I wish I'd remembered to look at my tranny make today :soapbox:
     


  4. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,614 posts, 670 likes
    Hunter 430
    US Waveland, MS
    Who made your dripless seal?
    Jim...
     


  5. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Lasdrop GenII. But the PYI PSS in long too. They both have the carbon, metal ring, compression stackup. My exposed shaft working space is too limited.
     


  6. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Drove back out tonight to verify my transmission. It's a Kanzaki also. Split coupling is on order. Now I have to find someone who can "fit and Face" the coupling and shaft. I hear a lot of "we can figure it out" from the machine shops. This is not common around here.
     


  7. JRacer

    JRacer

    Joined Aug 9, 2011
    677 posts, 155 likes
    Beneteau 310
    US Cheney KS (Wichita)
    I would consult Doug V. He would likely have some insight or contacts on a reputable machine shop to help.
     


  8. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Thanks! If anyone would know it would be Doug. Might save me a long trip to OK
     


  9. NYSail

    NYSail

    Joined Jan 6, 2006
    1,694 posts, 71 likes
    Beneteau 423
    US Mt. Sinai, NY


  10. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Thanks for the find NY. I will call him!
     


  11. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Well, he replied. He just works on props. None of the stinkpot dealers do it. The machine shops say they could "figure it out", but an error here could sink my boat! I'm may be using Phil's guy in Stillwater OK after all.
    On the plus side, it gives me a chance to visit West Marine in Tulsa :biggrin:
     


  12. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    One final question to help me decide if I need to do this or not; I have a thick orange vibration dampener between the transmission flange and the shaft coupling. How effective is facing the coupling in this setup? If the purpose is to have to perfectly true and flat connection between the coupling and the transmission flange, doesn't the dampener undermine the machine work? In other words. if I have the dampener, do I need to have the coupling faced? What does fitting the coupling buy me if the new split coupling has a good interference fit on the shaft? Is it done so that the shaft and coupling are true to each other so it can be properly faced? I'm thinking that because of the dampener, the machine work may be unnecessary. Opinions?
     


  13. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,614 posts, 670 likes
    Hunter 430
    US Waveland, MS
    Get rid of the "vibration dampener".

    Lets compare it to a auto shock absorber. You hope the ups are out of frequency with the downs, thus reducing the maximums.

    What is causing your vibrations? At what shaft RPM?
    Jim...

    PS: If your shaft is out of alignment , say goodbye to your new seal.
     


  14. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    Jim,
    That thought crossed my mind as well. I could sure use the extra clearance for installing my new dripless shaft seal. The dampener was there when we bought the boat. Not sure if they come that way, a PO had a problem, or it was just a cool new item to add. They list over $300. I don't have any noticeable vibration, whether it's because of the dampener or not. They had to add a riding ground strap on the shaft, because the flexible dampener has isolated it from the engine ground circuit.
     


    JamesG161 likes this.
  15. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    This is how it is advertised. It's called a "Drivesaver"

    4" Drivesaver fits Yanmar transmissions by Globe Composites
    Reduces vibration and provides a flexible non-metallic barrier between your transmission and propeller shaft. It absorbs extreme shock and torque caused by impact with logs, rocks and line. Drivesaver with stands oil, sludge, saltwater and temperatures of -65F to +225F. All metal components and hardware are plated for corrosion resistance and long life.

    [​IMG]
     


  16. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,614 posts, 670 likes
    Hunter 430
    US Waveland, MS
    One made by PYI...
    http://www.pyiinc.com/flexible-shaft-couplings.html

    In that design, there is a metal bar that "flexes", for Propeller "strikes". Typical sailboat shafts are short, low RPM and somewhat protected by the keel.

    Impact hits are not "vibrations" per se.

    Torque vibrations are normally cutlass bearing wear or bad engine mounts. Both of those will shorten your new seal life. But you have a spring and flexible connector to act as a minor vibration absorber, in your new seal.

    Jim...
     


  17. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    I don't detect any excessive vibration, and I don't expect any "hits" or arguments with crab pots etc on the big pond we sail on. The cutlass bearing has been replaced. I'm going to talk to the PropShop where I bought the split coupling and solicit their opinions as well.
     


  18. Rick D

    Rick D

    Joined Jun 14, 2008
    6,497 posts, 146 likes
    Hunter Legend 40.5
    US Long Beach, Shoreline Marina, CA
    I ordered the R&D split coupling for my next haul when I will be replacing my shaft seal bellows for the second time in 20 years. I also ordered their flex coupling. Having read a paper from Cummins Marine regarding their strong recommendation to install a flexible coupling, I figured I would try it. It is pricey though. Not trying to fix a problem. BTW, found the measurement for my cutless bearing found in my manual was wrong, thanks to the guys here at SBO. Thanks!
     


  19. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,531 posts, 668 likes
    Hunter 30T
    US Cheney, KS
    I called the propshop to discuss the Drivesaver. They said it does reduce vibration some, but it's main purpose is to prevent a snagged prop from destroying the transmission. That's a bad thing. Anyway, they also said that with out without the Drivesaver, the coupling and shaft should be fit and faced. They use a 2# lead hammer to test the fit.
    So things are coming together for my trip south. I'll be driving south to Stillwater to drop off the parts, continue to Tulsa to drop off my headsail for repairs, hang out at West Marine until the sail and shaft are ready and head back home to Wichita.
    Meantime I'll be buying a couple Caframo fans, some line, assorted hardware and whatever else is on sale that I can't resist. I'm glad the admiral isn't coming.

    It's not a voyage, but it is boat-related :cowbell:
     


    Rick D likes this.
  20. Gunni

    Gunni

    Joined Mar 16, 2010
    4,975 posts, 895 likes
    Beneteau 411 Oceanis
    US Annapolis
    If your Kanzaki is like my Kanzaki it has slip clutches or cones in the transmission. Much like a Japanese motorcycle wet clutch, they can take a shock load.
     



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