


Question- propeller shaft failure
I have a 4 year old Surf Boat. We use it a ton. 600+ hours. But actually surging is probably less than 50 hrs. Anyway 2 years ago we were driving 25 mph in 50' of water and boat stopped. Lost all propulsion. Got towed in and found the shaft snapped off behind the strut. Took it to dealer and they asked "what did you hit?" We didn't hit anything that day or prior. So the dealership did cover this under warranty. Now fast forward to this past weekend. Just my wife and I, cruising about 25 mph, enjoying the water. After an hour of cruising, the boat stops again. Same as two years ago. Pulled boat out and found a snapped shaft. Here is my theory, a month prior to the shafts breaking the propellers were swapped out by the dealer. I have a surf prop for winter, and a go fast prop for summer. Is it possible that maybe the keyway was not lined up properly, or the propeller not installed correctly? The bottom of the boat is damage free except for the nicks from when the prop came off. Anyone else experience this?