YES This is caused by slippage inside the transmission - a bronze cone mates against an iron.... anti-cone ...I guess, and the surfaces become glazed and slip. bang bang bang like a broken prop.
These are the exact symptoms I experienced and only after spending a great deal of money on mounts (needed) a new prop, (needed) cutlass bearing (needed) and shaft (probably not needed) did I figure out the real problem. Sick of shovelling cash around, and with the boat in the water, I took the gearbox out myself (2 hrs or less, in a 33-2) stripped it, lapped the internal bronze cones against their mating surfaces, and reassembled. Was back in action in 24 hours at a cost of around $40. Helps to have a physique and arms like Gollum. Good chance to clean some of the surfaces where cables ground to the engine. do not delay fixing this, it will get progressively worse, occur more frequently., then will really start to slam, and could be uncooperative when you need it most. Dave Windstar, 33-2, Whitby ON. Message: 5 Date: Mon, 9 May 2016 09:14:46 -0700 From: Andrew Means <andrew.cnc...@gmail.com> To: cnc-list@cnc-list.com Subject: Re: Stus-List Soft thumping/banging when in gear at low-rpm? Message-ID: <etPan.5730b779.5f34a65d.13b@worsley.local> Content-Type: text/plain; charset="utf-8" Ugh - that sounds expensive. I?ll see about holding the lever down, maybe it just needs tensioning?? --? Andrew Means S.V. Safari - 1977 C&C 34 Mk I Seattle, WA On May 9, 2016 at 9:12:16 AM, Derek McLeod via CnC-List ( cnc-list@cnc-list.com) wrote: I had a similar issue with my 29mk2 with Yanmar 2GM. Turned out it was the transmission slipping. I suspected my Flexofold prop at first, and eventually discovered that pushing the shifter hard down helped, before having a mechanic aboard who immediately recognized it as the transmission. All better now since having it rebuilt. Adjusting the shift cable may help as well.? Derek McLeod? Aileron, 1983 29MK2 Toronto, ON _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated! -------------- next part -------------- An HTML attachment was scrubbed... URL: < http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/20160509/b1580466/attachment-0001.html >
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