strange sound coming from boat or my engine

1961_merrill

Recruit
Joined
Aug 31, 2005
Messages
5
I have a noise that sounds like I have a boat dock bumper under my boat.
When I'm driving my boat at 5 knots or so, a noise that sounds like a dock bumper on a 4 ft rope banging on the bottom the boat is what I hear. The boat is a 1960, 16 ft mahogeny runabout with a 40 hp outboard.
The motor / trans sounds good, I do not hear any miss fires or gear sounds.
The hull is all attached and strong, ribs and cross members are fine.
What could cause this sound / noise ?
Thanks
 

gcboat

Lieutenant Commander
Joined
May 29, 2007
Messages
1,822
Re: strange sound coming from boat or my engine

More info would be nice. New sound? Old sound? Rough water? etc.
 

Mark42

Fleet Admiral
Joined
Oct 8, 2003
Messages
9,334
Re: strange sound coming from boat or my engine

Have you noticed any dock bumpers missing?
 

1961_merrill

Recruit
Joined
Aug 31, 2005
Messages
5
Re: strange sound coming from boat or my engine

I have a noise that sounds like I have a boat dock bumper under my boat.
When I'm driving my boat at 5 knots or so, a noise that sounds like a dock bumper on a 4 ft rope banging on the bottom the boat is what I hear. The boat is a 1960, 16 ft mahogeny runabout with a 40 hp outboard.
The motor / trans sounds good, I do not hear any miss fires or gear sounds.
The hull is all attached and strong, ribs and cross members are fine.
What could cause this sound / noise ?
Thanks

No missing bumpers, the water was still, the sound is new.
I take the boat out of the water every day after using, and after this noise started I checked the boat all over.
 

kmurray802

Seaman
Joined
Jun 15, 2007
Messages
61
Re: strange sound coming from boat or my engine

I've had self bailers make a popping noise.Is it possible that hull lamination has seperated??Don't know much about how mahogany hulls are constructed.Have you tried pushing up on hull when boat is out of water?:confused:
 
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