When I was installing my rebuilt Yanmar 3QM30, I called the folks at Transmission Marine Inc in Fort Lauderdale, FL for some advice (and I needed to purchase a replacement dipstick for the paragon). They strongly stressed the importance of precise shaft alignment to avoid future problems. First mentioned was the Walter v-drive seals failing is not properly aligned. I spent plenty of time aligning using feeler gauges on all sides of the coupler. After the first year, I verified the alignment. So far, I have not have any issues with the v-drive coupler.
I would NOT recommend stainless steel bolts. As I recall, stainless has less than 25% of the sheer strength compared to a grade 8 bolt. Grade 8 bolts are industry standard for demanding applications such as automotive suspensions. I used nickel anti-seize on the bolts and keep the coupler painted and corrosion free. - Paul E. 1981 C&C 38 Landfall S/V Johanna Rose Fort Walton Beach, FL http://svjohannarose.blogspot.com/ > On May 24, 2018, at 8:20 AM, cnc-list-requ...@cnc-list.com wrote: > > From: Russ & Melody via CnC-List <cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com><mailto:cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com>>> > Date: 5/24/18 12:37 AM (GMT-05:00) > To: cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com><mailto:cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com>> > Cc: Russ & Melody <russ...@telus.net > <mailto:russ...@telus.net><mailto:russ...@telus.net > <mailto:russ...@telus.net>>> > Subject: Re: Stus-List Coupling bolts shearing > > > Hi Jim, > > My first question is, "Did someone recommend and use stainless steel bolts, > say 316L, as the "best" for marine application?" > > Cheers, Russ > Sweet 35mk-1 > > > At 11:48 AM 5/23/2018, you wrote: > > The boat in question is an 81 landfall 38. > The v-drive coupling bolts have sheared off 3 times and caused loss of power. > Have been very careful to pause when changing gears. > The westerbeak engine runs great throughout all this. The shaft removed and > checked after the second time. The 2 bladed max prop sent back and rebuilt. > New motor mounts installed by po when replacing engine. About 4 years ago > (<200 hours on engine) coupling. Allignment done each time and found okay. > I am looking for advice, suggestions, similar situations and corrections. > HELP > Losing confidence in boat. > Thanks > Jim schwartz > SEA YA I > 38 LF > Washington nc
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