Done what i can at mooring away from home. Hard to access of course. With cable off Transmission shifter moves easily by hand. Cable also seems freely moving. Convinced that shift lever was upside down since rib was ground away from apparent rubbing. Swapped it so now shift lever up is forward and down reverse. Not sure if there is a standard. Transmission fluid level fine and clean Changed that in spring. Won’t be able to tell if i improved anything until tomorrow trip home. Still unclear whether slipping slightly out of gear would cause vibration. Boat did not obviously slow down while vibrating. Could a Maxprop issue cause that? Thanks for ideas. Dave
Sent from my iPhone > On Aug 25, 2020, at 12:18 PM, Dave S <syerd...@gmail.com> wrote: > > With the kanzaki (Yanmar) transmissions, forward and reverse are engaged by > moving what is in effect a double ended Bronze cone, fore and aft. In one > direction it engages a conical Steel female mating cone-surface for forward, > in the opposite it engages another for reverse. When neither cone is > engaged, the engine is in neutral. > The transmission relies on the friction between these surfaces to remain > slip-free. > The surfaces can become glazed over time and begin to slip. In my case the > vibration was more like a single brick in the spin cycle of a washing > machine. BANG BANG BANG > This was rectified by disassembling the transmission and lapping each side of > the bronze cone with its mating steel ... conette. > > Dave - 33-2, Yanmar 2gm, kanzaki > > Sent from my iPhone > >> On Aug 24, 2020, at 9:12 PM, davidakne...@gmail.com wrote: >> >> >>> While motoring today we had the boat suddenly start vibrating violently. I >>> had encountered this periodically before and thought something was going on >>> with the prop. It has been getting gradually worse this season. I am >>> pretty sure now it is the transmission slipping partly out of gear. >>> Slowing the engine , shifting to neutral then back into gear makes it >>> smooth again, but today it happened over and over. In Jamestown at marina >>> so i looked at transmission to see if it was a cable issue. Very confused >>> by what i see and not something i have ever worked on. My guess is that >>> cable is not allowing shifter to fully engage or else transmission is shot. >>> There is an area of the engine support that appears to be worn away by the >>> shifter movement???? No idea how that could be. Also there is a green >>> sleeve on the cable near the clamp but not in the clamp. I am wondering if >>> the cable is clamped so that it cannot rotate forward far enough to engage >>> completely. Considering loosening clamp and moving cable housing forward >>> but not sure if that would allow it to fully engage. What sets the limit >>> of that shifter movement? Any thoughts appreciated. Dave >>> Ps. I have pics but cant send to list. >>> >>> Sent from my iPhone >> >> _______________________________________________ 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
