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Vibration problem |
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Jeffs 
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Joined: June-25-2024 Location: Michigan Status: Offline Points: 4 |
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 Topic: Vibration problemPosted: June-26-2024 at 12:44pm |
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I just purchased a '94 Ski Nautique with 351 engine. Nice boat but there's a vibration at 3000+ rpm. There's a ding in the edge of one of the the prop blades. I was wondering if that could be the problem or could it be a prop shaft/bushings issue?
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Jeffs
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2995 |
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Posted: June-26-2024 at 2:22pm |
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Even a small ding in a prop can cause a vibration. If the prop was hit hard, the shaft could be bent…they usually bent just aft on the strut. A slightly bent shaft can also produce a vibration.
What is the current dinged prop? JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3764 |
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Posted: June-26-2024 at 6:18pm |
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Does the vibration exist when your rev your engine to 3500 RPM in neutral? You want to rule out an engine problem before chasing a prop or shaft issue.
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Jeffs
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Joined: June-25-2024 Location: Michigan Status: Offline Points: 4 |
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Posted: June-26-2024 at 11:23pm |
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I haven't tried that. Good point.
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Jeffs
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Joined: June-25-2024 Location: Michigan Status: Offline Points: 4 |
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Posted: July-05-2024 at 9:43am |
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Tried the RPM test in neutral but would only get up to 1500rpm. Must have a governor in neutral. Checked the shaft for play and it seemed pretty snug. Hopefully it's the nickle size ding in one of the prop blades.
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2995 |
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Posted: July-05-2024 at 1:42pm |
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Try revving in neutral with the throttle lever moving "in reverse" instead of forward. Be careful, as the engine will spool up quickly.
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11155 |
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Posted: July-05-2024 at 4:09pm |
There's a good chance it's the ding, so take the prop off for a trip to the prop place of your choice, since a repair would be a good thing no matter what and while it's off you can use a dial indicator on the taper where the prop sits to see if the shaft is bent. |
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MrMcD
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Posted: July-05-2024 at 11:09pm |
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And if it vibrates after prop repair as Ken said, teh shaft is bent also. Mine was. It happens.
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Jeffs wrote: