Did you check you engine/ shaft alignment? It's a common cause of vibration. Robin
> On Jun 14, 2016, at 8:55 PM, Dave via CnC-List <cnc-list@cnc-list.com> wrote: > > I purchased my boat, a 1984 35Mk3 three years ago. The first season the boat > would vibrate badly when I'd slow down under power. I'd put it in reverse, > throw it into forward (ouch) and things would be fine. The blades always > opened initially when I motored off the mooring but if I slowed down the flow > over the blades exceeded the centripetal force and folded one of the blades > and not the other . So, that winter I sent the 2 bladed prop back to Martek > to have it rebuilt. They said the blades were so badly oxidized that they > couldn't weld them to build up the stops so, they replaced the blades with > another pair (used) they had available. To be sure the problem was fixed I > also had the cone clutch in the transmission replaced. Last summer the only > thing that changed was that the boat now moved forward when the lever was > pulled back to reverse and visa versa. The vibration still happened under the > same scenarios. Having had the blades replaced and the transmission rebuilt > there was no way to tell whether it was that the blades were the opposite > hand as what I had previously or if the transmission was done incorrectly. > > This spring I purchased a 2 blade Flexfold geared prop and guess what, the > vibration problem is still there and forward and reverse are still, yep > reversed. So, I know that the direction issue is the transmission and that is > easily fixed by rotating the linkage arm. But, I'm totally baffled as to why > the vibration problem has not been resolved. > > So, if anyone has any suggestions or ideas they would be greatly appreciated. > > Dave J > Saltaire > C&C 35Mk3 > Bristol, RI > _______________________________________________ > > 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!
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