Bill, We had same issue 300 nm offshore when someone started engine in reverse. Fortunately we didn't loose the shaft & boat.
Solution double hex screw AND drilling dimple further into shaft. Stephen Thorne Dejavu' 34+ Sent from my iPhone > On Sep 20, 2016, at 6:32 PM, cnc-list-requ...@cnc-list.com wrote: > > Send CnC-List mailing list submissions to > cnc-list@cnc-list.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > or, via email, send a message with subject or body 'help' to > cnc-list-requ...@cnc-list.com > > You can reach the person managing the list at > cnc-list-ow...@cnc-list.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CnC-List digest..." > > > Today's Topics: > > 1. Prop Shaft coupling (wwadjo...@aol.com) > 2. Re: Prop Shaft coupling (Della Barba, Joe) > 3. Re: Prop Shaft coupling (Steve Staten) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 20 Sep 2016 16:17:21 -0400 > From: wwadjo...@aol.com > To: cnc-list@cnc-list.com > Subject: Stus-List Prop Shaft coupling > Message-ID: > <mailman.306.1474410776.17678.cnc-list_cnc-list....@cnc-list.com> > Content-Type: text/plain; charset="us-ascii" > > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20160920/fbacad5d/attachment.html> > > ------------------------------ > > Message: 2 > Date: Tue, 20 Sep 2016 20:23:50 +0000 > From: "Della Barba, Joe" <joe.della.ba...@ssa.gov> > To: "'cnc-list@cnc-list.com'" <cnc-list@cnc-list.com> > Subject: Re: Stus-List Prop Shaft coupling > Message-ID: > <47f1e615013048868e06bbfbbdaeb...@nsc-dag3-06.ba.ad.ssa.gov> > Content-Type: text/plain; charset="utf-8" > > One boat that was forever doing this turned out to have a bad motor mount. > Might want to check that? > Joe > Coquina > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of William > Walker via CnC-List > Sent: Tuesday, September 20, 2016 16:17 > To: cnc-list@cnc-list.com > Cc: wwadjo...@aol.com > Subject: Stus-List Prop Shaft coupling > > > Some may remember that around mid summer I posted that my prop shaft had > pulled out of coupling. Mine has two bolts which go through coupling and > into small dimples drilled into shaft. They were wired in and over time the > ends had worn off and allowed shaft to pull out when reversed was applied to > prop. Some on list checked and had similar problems. I was surprised so many > Well, on haul out I discover it has happened again, with the new bolts. > Haven't pulled them yet to see, but shaft pulled enough to show key and the > dimples, still in place. > No excessive vibration or anything. > Bolts still appear tight. > Thinking maybe of going with two set screws in each hole, one snugged, > another on top. > Love to hear thoughts from listers with some experience. > Bill Walker > Evening Star > CNC 36 > Pentwater, Michigan > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20160920/b985096a/attachment-0001.html> > > ------------------------------ > > Message: 3 > Date: Tue, 20 Sep 2016 17:32:07 -0500 > From: Steve Staten <steve-sta...@cherokee.org> > To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> > Subject: Re: Stus-List Prop Shaft coupling > Message-ID: > > <84EF6C7F5B88DF41B6631E309DAC6A2302651B4ABC16@CNEXCH-MAIL1.cnmain.cherokee.local> > > Content-Type: text/plain; charset="utf-8" > > Five years ago, on one of my first solo sails on C?est La Vie, I allowed a > jib sheet to get overboard as I was motoring into the drowned ravine that is > the marina, here on the reservoir. I was focused on maintaining course. The > ravine is maybe 30 meters narrow, lined with expensive boats. The sheet and > propeller became enamored of each other and in taking the relationship to the > next level (the way snakes do), they managed to pull the propeller shaft free > from the coupling and the Westerbeke?s transmission. The coupling is a large > rubber donut about one inch thick and maybe eight inches in diameter. It was > all chewed up BUT the shaft bearing was not leaking. The boat glided to a > complete stop about 20 meters from the beginning of the dock. > > I had not yet learned to scull so I dropped anchor and swam to shore with my > phone and wallet in a ziplock bag on top of one of those square floating seat > cushions pushed gently ahead of me. It was a Sunday evening with no one > around and the sun going down behind the trees. The next day, I returned to > assess the damage. The temperature was in the mid-nineties (F) and the boat > was a fiberglass sweat lodge. The largest washers available managed to keep > enough of the torn parts of the coupler together in one piece to allow me to > restart the engine and ease into my slip. I was not yet a lister here and > had NO idea how to replace the coupler. > > In despair, I searched local roadsides for blown tires by the side of the > road (with polyester cords, of course). I finally found a good candidate and > fashioned a replacement coupler from the tread by dulling many box cutters. > The bolt holes needed a rat tail file to enlarge the drilled holes. The tire > tread has performed just fine since then. > > Steve Staten > C?Est La Vie > 26? C&C > Langley, OK, USA > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of William > Walker via CnC-List > Sent: Tuesday, September 20, 2016 3:17 PM > To: cnc-list@cnc-list.com > Cc: wwadjo...@aol.com > Subject: Stus-List Prop Shaft coupling > > > Some may remember that around mid summer I posted that my prop shaft had > pulled out of coupling. Mine has two bolts which go through coupling and > into small dimples drilled into shaft. They were wired in and over time the > ends had worn off and allowed shaft to pull out when reversed was applied to > prop. Some on list checked and had similar problems. I was surprised so many > Well, on haul out I discover it has happened again, with the new bolts. > Haven't pulled them yet to see, but shaft pulled enough to show key and the > dimples, still in place. > No excessive vibration or anything. > Bolts still appear tight. > Thinking maybe of going with two set screws in each hole, one snugged, > another on top. > Love to hear thoughts from listers with some experience. > Bill Walker > Evening Star > CNC 36 > Pentwater, Michigan > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20160920/60755d6a/attachment.html> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > CnC-List mailing list > CnC-List@cnc-list.com > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > ------------------------------ > > End of CnC-List Digest, Vol 128, Issue 89 > ***************************************** _______________________________________________ This list is supported by the generous donations of our members. 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