vibration under power

[spooner]

I have a 99 2100I 350 mag velvet drive transmission. yesterday after riding for a short time the driveline started vibrating as if it had a damaged propeller. Close inspection of the propeller showed no signs of damage at all there was also no debris stuck in fins or prop. Trans fluid is clean, however I am not sure on the level. Do I check it with the engine off or running? I have heard of engine and trans alinement issues causing vibration problems do this happen suddenly? Also I am in northwest Iowa and do not trust the service dept. of the local dealer so fi anyone can reccommend a dealer maybe in the kansas city or minneapolis area that would be great.

Thanks in advance
Brad

[Jester]

Thats a tough call. Could be the strut bearing has worn out. But im not sure.

I would assume that the fluid level should be checked while the engine is off for the most accurate reading.

engine/trans shaft alignment most likely is the issue if its not the strut bearing. It could happen over time that the engine has moved slightly.

[drewsnyder]

You could take your boat to stateamind in st. louis.

[Tige M.D.]

check the coupler bolts. they could be loose.

No, shaft mis-alignment does not happen fast unless the engine mount bolts came loose.

Check trans level immediatly after shutting down the engine.

[drewsnyder]

Could be as simple as the prop out of balance.

[Boarder_X]

I have bent a prop. The guy I took it too, said that it wasn't far enough out of wack to produce vibration. He said I should check the drive shaft. I had already put on my spare, and taken the boat out. It ran fine. I told him that. He was very surprised.

My point. You may not be able to tell, but it doesn't take much, to bend a prop. That could be your problem.

X

[Andrew]

Originally posted by Boarder_X
I have bent a prop. The guy I took it too, said that it wasn't far enough out of wack to produce vibration. He said I should check the drive shaft. I had already put on my spare, and taken the boat out. It ran fine. I told him that. He was very surprised.

My point. You may not be able to tell, but it doesn't take much, to bend a prop. That could be your problem.

X

That is correct. The smallest nick on the prop can make all the difference in the world. The first thing to check if you ever get a vibration is the prop. Remember the shaft is 1 1/8' think and it will take a lot to bend it. 99% of the time its the prop that has caused the vibration.