I had the same problem. I bought a new cone, and installed it, but still had the same problem. Then I discovered that there was too much "play" in the shifting. In other words, when I disconnected the shaft, I could move the transmission coupling forward and back, which allowed the cone to slip. I corrected it by installing a shim in the transmission. Problem solved. You might try that first. When you disassemble the transmission, inspect the cone to see whether it still has grooves or whether it's smooth. If you need a new cone, I still have the one I bought for $285 plus $12 shipping from Georgia. You can have it for $250 including shipping. My transmission is a Kanzai KH-A. Engine is a 3GMF.
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR My 1984, 35 MKIII has its original Yanmar 3GM and a 1984 Martec folding prop. I was experiencing really bad vibration at the end of the season as if the prop wasn’t opening or as if only 1 of the 2 blades was unfolding. I’d put it in reverse (during which there was never any of the vibration) then put it into forward quickly and hard and after several attempts it would usually be OK until I slowed down like when approaching the mooring and then it would happen again. I sent the prop back to Martec to get it refurbished and when speaking to them they suggested that although the prop was in need of refurbishment that the vibration I was experiencing might be due to the engine clutch slipping. When I asked a Yanmar repair guy about that he said that might indeed be the issue. Apparently the only way I’m going to be able to tell if the refurbished prop was the cause is when its back on the shaft and the boat’s back in the water. Since I really don’t want to miss any of the short season, racing beginning just a few weeks after the boat’s back in the water and the cost and hassle of pulling the boat out again after it’s launched in the spring, I’m leaning towards taking prevent yanking the transmission out, bringing it to a shop and having it rebuilt. Have any of you had this experience? Has having the prop fixed/replaced always solved the issue? Or, is there a good possibility that it is indeed the transmission? Any experience and/or advice the group can provide would be greatly appreciated. Dave Saltaire Bristol, RI.
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