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Old    Ken W (kenteck)      Join Date: Jan 2005       06-08-2011, 1:13 PM Reply   
Has anyone had this issue before….. looking for some input.
I have a Ski Brendella and replaced the following.

Shaft.
Balanced the Prop.
Had the Strut looked at.
Had it aligned, spec is .001

its getting better and better each time it gets worked on, there isn’t anything left to do, but still vibrates.
The vibration starts around 34mph on up.
If anyone has been through this before, your input would help
Old    Art (rallyart)      Join Date: Nov 2006       06-08-2011, 1:43 PM Reply   
You could be getting the vibration from the water at that speed. That could be caused by the tracking fins or just the hull design. Another possibility would be that the exhaust is vibrating against the hull somewhere under the floor.
Just guesses.
Old    Wotan (wotan)      Join Date: Jul 2008       06-08-2011, 2:45 PM Reply   
Strut bearings?
Old    Seahawks #1 Fan Robert T (cwb4me)      Join Date: Apr 2010       06-08-2011, 3:02 PM Reply   
You could be getting the vibration from your vibration dampner on the crankshaft.Sometimes the rubber between th two pieces deteriorates.
Old    Baitkiller (baitkiller)      Join Date: Jan 2010       06-08-2011, 4:39 PM Reply   
First thing: While on the trailer soap up the shaft bearing and stuff a garden hose in the strainer, fire it up and put it in gear.
Now go look at the drive line.
Is the shaft whipping?
Does it look like the hub is wobbling on the shaft?
If the shaft is whipping, send it back and try again.
If the hub has a pronounced wobble it may be miss-bored. try another wheel after making sure the key isn't binding.
If the hub has a slight wobble or you see no discernible anomolies try lapping the hub to the shaft taper.
First make damn sure the key is not binding the prop hub. Install the prop with no key and mark the shaft with a sharp pencil against the leading edge of the hub. This mark must re-align when the key is installed.
If that is Ok it's time to lap the taper:

Cheep and easy and has fixed more vibration issues on big dollar yachts than anything else in my career.

Your local auto parts house ( you may need a real parts house, not autozone) will have Clover valve grinding compound. Buy it in coarse.

Slather the compound on the inner hub and shaft taper, place the wheel on the shaft with no key. Lock down the shaft and spin the prop until you are bored of it. (1 beer)

Pull it off and clean it up, Any high spots will be shiny. Rinse and repeat until no high spots remain. (2 beers)

All other things being equal the boat will run as smooth as hot love.

For what its worth, all the best.
John
Old    Cory D (cadunkle)      Join Date: Jul 2009       06-08-2011, 4:46 PM Reply   
My money is on strut bushings if you haven't replaced them. Quick easy way to check is to pull the coupler and prop, then pull the shaft out so it's only through the strut. Try to wiggle the shaft side to side and up and down. If there is ANY movement or slop in the bushings replace them. They should be tight to the shaft allowing no movement.
Old    Ken W (kenteck)      Join Date: Jan 2005       06-08-2011, 4:58 PM Reply   
The strut is in great shape and nice and tight, there is one thing i have been reading up on is the difference between 3 and 4 blade props, 4 blade props don’t vibrate as much as a 3 blade prop at high rpm's, but that is a 400.00 prop and just to try... hmmm, not sure

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