I sounds like having the bolts loosen is the root cause. When I got my straight drive the coupler was held by carbon steel bolts with lock washers and nuts. They never came loose.
When I added a vibration dampener the new bolts came with nylock nuts. They advised torqing them to the correct spec. I've never had them come loose either. Lock nuts, lock washers, locktite, and/or the proper torque are the only suggestion I can provide based on your description. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Wed, May 23, 2018, 3:35 PM detroito91 via CnC-List <cnc-list@cnc-list.com> wrote: > The v-drive has a coupler holding the shaft . The bolts on the coupler > loosen and then shear off. Fortunately only the bolts have been the only > damage > Ji > > > -------- Original message -------- > From: ed vanderkruk <primeinter...@gmail.com> > Date: 5/23/18 3:16 PM (GMT-05:00) > To: cnc-list@cnc-list.com > Cc: Jim Schwartz <detroit...@aol.com> > Subject: Re: Stus-List Coupling bolts shearing > > You have a keyway in the shaft and transmission coupling? > > Ed > > On Wed, May 23, 2018, 3:14 PM ed vanderkruk, <primeinter...@gmail.com> > wrote: > >> When you say coupling bolts ... the bolts mounting the transmission to >> the bell housing? >> >> Anyone check the transmission? >> >> >> Ed >> >> Prime Interest >> 1982 LF38 >> Toronto >> >> On Wed, May 23, 2018, 2:49 PM detroito91 via CnC-List, < >> cnc-list@cnc-list.com> 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 >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
