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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. Dan_Y

    Dan_Y

    Joined Oct 13, 2008
    421 posts, 37 likes
    Hunter 36
    US Hampton
    How did it work out Justin? We installed a PSS dripless on our '91h30t and used a new, conventional coupling from yanmar. Had to lower the rudder because i replaced the prop shaft as well. But had adequate room. I considered a split coupling but read somewhere they didn't align as well as a conventional, one piece coupling. Probably just bunk.
     


  2. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,402 posts, 620 likes
    Hunter 30T
    US Cheney, KS
    Still waiting to get it back from the machine shop. The split coupling has to be torqued evenly or it won't be straight when it comes time to face it. I sent a video demo of what happens when you don't torque it to the machinist.
     


  3. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,390 posts, 568 likes
    Hunter 430
    US Waveland, MS
    Can you post that video link here, please.
    Jim...
     


  4. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,402 posts, 620 likes
    Hunter 30T
    US Cheney, KS
    Here you go Jim
     


    JamesG161 likes this.
  5. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,390 posts, 568 likes
    Hunter 430
    US Waveland, MS
    Consistant Hammer Dings? :laugh:

    I did like the "wedge" use.

    Thanks posting a professional job.
    Jim...
     


  6. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,402 posts, 620 likes
    Hunter 30T
    US Cheney, KS
    Finally got my new coupling fitted and faced, installed and the LasDrop dripless seal installed as well. Not much shaft to work with. Not enough left to reinstall the ground strap that rode on the shaft. What is still exposed has a groove for the shaft key. Not a smooth surface to ride on. I will have to add a ground wire from the trans flange to the coupling to bridge the Drivesaver.
    Then I can put my rudder back on. That much closer to getting in the water.

    20180414_132617_resized.jpg
     


    JRacer likes this.
  7. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,390 posts, 568 likes
    Hunter 430
    US Waveland, MS
    Where did you hook you seal purge to?
    Looks like a great job!
    Jim...
     


  8. Justin_NSA

    Justin_NSA

    Joined Jul 7, 2004
    4,402 posts, 620 likes
    Hunter 30T
    US Cheney, KS
    I fastened it to the siphon break at the top of the mixing elbow. The directions say if you stay under 20 knots it is used as a vent. If faster it has to be hooked up up to a water source.
     


  9. JimInPB

    JimInPB

    Joined Aug 22, 2017
    579 posts, 161 likes
    Hunter 212 & 170
    us West Palm Beach
    I usually use jack screws rather than wedges. I usually true my chuck rather than cheating with a steady rest. His methods seem to produce a good result.

    I think that the jack screws are easier to use & more difficult to cause damage with, compared to the wedge & hammer trick.

    That's just me though.
     


  10. JamesG161

    JamesG161

    Joined Feb 14, 2014
    2,390 posts, 568 likes
    Hunter 430
    US Waveland, MS
    You water source will be the water you sail in, Silt and all. It is the reverse thrust that compresses your spring.

    Also remember the high point of your vent MUST be above the water line of your full cargo loaded boat.
    Otherwise it will back flow into your open engine valve.
    Jim...
     



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