Back when I worked on boats we tried EVERYTHING – new bolts, better bolts, safety wire, etc etc. to solve an issue like this. What turned out to be the issue was one bad motor mount that let the engine yank way out of position going into gear. Joe Coquina
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of detroito91 via CnC-List Sent: Thursday, May 24, 2018 6:09 AM To: cnc-list@cnc-list.com Cc: detroito91 <detroit...@aol.com> Subject: [EXTERNAL] Re: Stus-List Coupling bolts shearing No..but i'm going to follow up on that. Used grade 8. Jim -------- Original message -------- From: Russ & Melody via CnC-List <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> Cc: Russ & Melody <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 [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png]<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> Virus-free. www.avg.com<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>
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