Once you get your new bolts in, get someone to shift F-N-R while you watch the engine and motor mounts. See if one or more of the mounts is allowing excess movement. For once I am glad to not have rubber motor mounts, my engine is hard-bolted to the boat. Joe Coquina
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of detroito91 via CnC-List Sent: Thursday, May 24, 2018 12:29 PM To: cnc-list@cnc-list.com Cc: detroito91 <detroit...@aol.com>; Dreuge <dre...@gmail.com> Subject: [EXTERNAL] Re: Stus-List Coupling bolts shearing Great suggestions. Will do. Was planning on grade 8 bolts. Can do alot of thinking during my 6 hour tow back to my slip! Thanks jim -------- Original message -------- From: Dreuge via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Date: 5/24/18 11:07 AM (GMT-05:00) To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> Cc: Dreuge <dre...@gmail.com<mailto:dre...@gmail.com>> Subject: Re: Stus-List Coupling bolts shearing 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<mailto: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>> 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> Cc: Russ & Melody <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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