Rattle/Vibration on hard acceleration

[AFM691]

I hit a submerged tree in my SAN v215 at 5mph and the impact was strong enough to kill the engine. I restarted and tried to accelerate and immediately had a vicious vibration, so I pulled the boat out and called it a day. The prop and strut were both bent and the rudder had a lot of play. I had the prop repaired at Prop Shop Richmond and also put a new strut on which included new cutlass bearings. Also replaced the rudder and did an engine alignment. Went out for a test run and although it was MUCH better, there is still some vibration on hard acceleration. I'm calling it a vibration, but I can't actually feel anything. I can hear it though. It sounds like the dash is going to rattle itself loose, but I don't feel any vibration in the wheel or anywhere. And it is smooth on easy acceleration, and once on-plane it feels great.

Once I got the boat home, I checked the prop shaft at the taper with a dial indicator to see if it was bent and I had about .004" of movement. I decided to go ahead and install a new prop shaft and coupler. Went out for another test run and still have the vibration/rattle. At this point I am pretty stumped and tired of throwing money at this thing. I'm hoping someone here has some ideas as to how to resolve this vibration/rattle.

[NautiqueJeff]

Well, most people here aren't too familiar with Sangers, but it sounds like you have replaced everything that should be causing the vibration. My guess is that the prop still isn't balanced. I'd try a new one and see if that fixes it.

[Jonny Quest]

I agree with Keith. I'd check the prop. Many prop "repairs" only get things close to original. A new CNC prop (ACME or OJ) would likely clear up the vibration.

JQ

[NautiqueJeff]

Wrong site. This is Jeff, not Keith.

[AFM691]

Well, most people here aren't too familiar with Sangers, but it sounds like you have replaced everything that should be causing the vibration. My guess is that the prop still isn't balanced. I'd try a new one and see if that fixes it.

First off, my apologies for any confusion I might have caused by abbreviating Sanger - SAN. I now realize that stands for Super Air Nautique. :-)
So yeah, Last year I bought a 2015 Sanger v215, which is my first inboard. I posted on this forum hoping to tap into the extensive knowledge base here. I hope that's ok? I think the root cause of the problem I am having is not specific to Sanger, but more of an inboard thing that could occur with any v-drive wake boat? I've read through a lot of forums and it seems like there is good advice here.

Thanks for your and Johnny Quest's advice on the prop. I went back and really scrutinized the refurbed prop and found that one of the blades has a very slight deformity on the trailing edge. I don't know if it is enough to cause the vibration, but I'm taking it in to the prop shop to see if they can get it right. If I still have the vibration after that, then I guess I'll pony up for a new prop....

[NautiqueJeff]

The issue may not even be visible. If the prop isn't balanced, you'll get that vibration. See what the prop shop says, but be ready to just replace it if they can't get it right.