captainneo
Recruit
- Joined
- Jul 15, 2009
- Messages
- 5
Our I/O boat came with an alpha one gen II and was factory equiped with a 16 X 16 cupped prop. It was showing so much cavitation bubble wear, I ordered a Michigan Wheel prop of the exact same design, listed for our drive.
I put the new one on the boat and torqued the prop nut using the same thrust bearing as the old prop.
We took the boat out and it did not want to come on plane and it vibrated like mad in the channel on the way back unless it was trimmed to a sweet spot just about horizontal to the water line.
Docked and put the drive to full trailer and pulled on the prop and examined the nut. Locking tabs were still in place where I put them, the nut had not loosened at all. I pulled up on the prop as a unit and found I could get a lot of movement fore and aft on the prop shaft. I'd say at least 1/4 of an inch by guessing. Hub moves with the prop, clicks back and forth like the prop is rubbing on the outer surface of the drive instead of the thrust bearing.
Did not take the prop off since the dock is in a fresh water muddy bottomed river and there is no chance of getting the prop back if it dropped.
When you look at the two props from the back (examined them when put it on at the house), the center bearing surface is deeper inset on the new prop. These are fixed design props and are not the ones with the interchangeable hubs btw. The nut torqued up tight so I did not think twice. Now I know it is probably just at the end of the threaded section of the prop shaft and can't go screw down any deeper.
Do I need a different thrust bearing or did they manufacture the prop wrong?
Thanks for any help guys!
Long time lurker, first time poster, but this one has me stumped.
I put the new one on the boat and torqued the prop nut using the same thrust bearing as the old prop.
We took the boat out and it did not want to come on plane and it vibrated like mad in the channel on the way back unless it was trimmed to a sweet spot just about horizontal to the water line.
Docked and put the drive to full trailer and pulled on the prop and examined the nut. Locking tabs were still in place where I put them, the nut had not loosened at all. I pulled up on the prop as a unit and found I could get a lot of movement fore and aft on the prop shaft. I'd say at least 1/4 of an inch by guessing. Hub moves with the prop, clicks back and forth like the prop is rubbing on the outer surface of the drive instead of the thrust bearing.
Did not take the prop off since the dock is in a fresh water muddy bottomed river and there is no chance of getting the prop back if it dropped.
When you look at the two props from the back (examined them when put it on at the house), the center bearing surface is deeper inset on the new prop. These are fixed design props and are not the ones with the interchangeable hubs btw. The nut torqued up tight so I did not think twice. Now I know it is probably just at the end of the threaded section of the prop shaft and can't go screw down any deeper.
Do I need a different thrust bearing or did they manufacture the prop wrong?
Thanks for any help guys!
Long time lurker, first time poster, but this one has me stumped.
