Vibration problem
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=51647
Printed Date: January-28-2025 at 12:11pm
Topic: Vibration problem
Posted By: Jeffs
Subject: Vibration problem
Date Posted: 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? ------------- Jeffs |
Replies:
Posted By: Jonny Quest
Date 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 ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: MrMcD
Date Posted: June-26-2024 at 6:18pm
| 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. |
Posted By: Jeffs
Date Posted: June-26-2024 at 11:23pm
| I haven't tried that. Good point. |
Posted By: Jeffs
Date 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. |
Posted By: Jonny Quest
Date 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 ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: KENO
Date 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. |
Jeffs wrote:Posted By: MrMcD
Date Posted: July-05-2024 at 11:09pm
| And if it vibrates after prop repair as Ken said, teh shaft is bent also. Mine was. It happens. |