Jim’s boat has a Westerbeke 35D engine (3 cyl, 35HP) and Borg Warner BW7 transmission, with the usual V drive arrangement of a LF38. Engine and transmission were both newly installed in 2010. Had 140 hours on engine when the boat was purchased in 2015. About 200 hours on it now, as Jim has said.
Seal on the hydraulic pump in the Borg Warner transmission failed during the delivery from Charleston to Washington, NC in 2015 (seal had dried out during a couple of years when the engine only accumulated 4 hours of use by the PO, apparently). So the transmission was rebuilt at that time. There is a “damper” between the engine flywheel and the input shaft of the transmission. According to the illustration in the parts book, it looks sort of like the spring loaded pressure plate in a clutch arrangement. But it seems pretty unlikely that the damper would have failed with only 200 hours on the engine. The Walter v drive hasn’t got much space under it for the coupling, so Jim’s boat has a relatively small diameter coupling with 3 bolts in it. As Jim has said, this is the 3rd time in two years that the bolts have sheared off. As he has said, the feathering prop has been rebuilt, the shaft checked for straightness, bolts replaced (though there is a question whether the latest set is grade 5 or grade 8), engine aligned repeatedly(and BTW the motor mounts are new), etc., etc., etc. Jim (and everyone else aware of the problem) is getting really frustrated. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Frank via CnC-List Sent: Wednesday, May 23, 2018 3:39 PM To: cnc-list@cnc-list.com Cc: Frank <n...@comcast.net> Subject: Re: Stus-List Coupling bolts shearing Jim, I have a 79 38LF, serial number 001. I have had a similar problem. There were a combination of things that caused it. First, the engine was never bedded in the boat properly. I had to cut the engine mounts and rebuild them so the engine could be aligned with the prop shaft. Second, I had the Paragon SAOV transmission and V-drive rebuilt. Most of the internal components of both units were replaced. The prior owner installed a used SAOD and connected the v-drive to it. (Making it a SAOV) But, most important, have you replaced the vibration damper connected to the output shaft of the engine? It looks like a clutch plate but without the clutch material. It is between the engine and the transmission. Mine looked good but upon a thorough inspection it was found to be trash! My problem turned out to be a combination of the above, several “boat yards” aligned the prop with the v-drive but in actuality, there was a significant amount of difference between the two causing the bolts on the coupling to loosen. There was enough play in the v-drive output for it to look good. I would suspect that your vibration damper is not doing it’s job. Frank Frank Noragon S/V: Cool Change C&C 38LF, s/n: 001 Rose City Yacht Club Portland, Oregon From: detroito91 via CnC-List Sent: Wednesday, May 23, 2018 11:48 AM To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> ; Jim Schwartz Cc: detroito91 Subject: Stus-List Coupling bolts shearing 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
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