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Thump Question
#11397348
02/07/16 03:57 AM
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Joined: Jun 2013
Posts: 3,155
bush hog
OP
TFF Team Angler
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OP
TFF Team Angler
Joined: Jun 2013
Posts: 3,155 |
Some of you boat gurus....this just recently started....I can be running 40 mph, 3/4 trim and when I make a sharp turn I feel a thumping back around the engine. Got any ideas? I've checked all the mounting bolts on the engine and jack plate for tightness. This only happens in a tight turn. I do have a piece of the skeg missing but our local prop pro says that shouldn't be causing it. The shaft shows to be true and the prop bushing is good. This is a 18ft. Phoenix with a 150 SHO. Thanks for any info you can offer.
To whom much is given, much is required.
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Re: Thump Question
[Re: bush hog]
#11397365
02/07/16 04:08 AM
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Joined: Jul 2011
Posts: 4,100
David Burton
TFF Team Angler
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TFF Team Angler
Joined: Jul 2011
Posts: 4,100 |
Do you have Power Poles or Talons that could catch water in the turn?
David Burton 2015 Skeeter FX 21 +Ultrex +Helix 12 (x3) +Mega360 +MegaLive
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Re: Thump Question
[Re: bush hog]
#11397461
02/07/16 05:44 AM
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Joined: Nov 2014
Posts: 342
Garvin
Angler
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Angler
Joined: Nov 2014
Posts: 342 |
Have you ever discovered your fishing buddy missing right at that moment?
Just ONCE I'd like for someone to call me "Sir" without adding, "please stop making a scene.""The problem with quotes on the internet is having to ascertain whether or not they are genuine." -- Abraham Lincoln
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Re: Thump Question
[Re: bush hog]
#11397518
02/07/16 11:36 AM
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Joined: Dec 2011
Posts: 6,127
fitter2259
TFF Celebrity
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TFF Celebrity
Joined: Dec 2011
Posts: 6,127 |
Cavitation and harmonics can make some pretty weird noises and can resonate away from where it is actually occurring, are you sure its coming from the back of the boat? Check all of your compartments to make sure everything is buttoned down properly and not shifting enough to bump the inside of the hull in a 40 mph turn. Lastly, I'm no prop guru by any means but I have been around long enough to ride in a number of rigs that had skeg damage of varying degree, some had little to no effect while others had significant performance issues. If this noise your hearing did not occur before the incident with the skeg I'd start there, you probably need to address that anyway.
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Re: Thump Question
[Re: Garvin]
#11397527
02/07/16 11:47 AM
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Joined: Mar 2013
Posts: 9,169
Lee in Texas
TFF Celebrity
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TFF Celebrity
Joined: Mar 2013
Posts: 9,169 |
Have you ever discovered your fishing buddy missing right at that moment? God Bless Lee
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Re: Thump Question
[Re: bush hog]
#11397601
02/07/16 01:25 PM
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Joined: Jun 2013
Posts: 3,155
bush hog
OP
TFF Team Angler
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OP
TFF Team Angler
Joined: Jun 2013
Posts: 3,155 |
No power poles and my buddy noticed the bumping too. You can feel it. The skeg's been damaged awhile and this has just started recently. I need to carry the boat in for service soon and I'll get the dealer to take it for a spin as it's still under warranty. I just thought maybe someone here has run into this before. I've just probably overlooked something simple.
To whom much is given, much is required.
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Re: Thump Question
[Re: bush hog]
#11397617
02/07/16 01:39 PM
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Joined: Feb 2004
Posts: 28,420
Okie Poke
TFF Guru
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TFF Guru
Joined: Feb 2004
Posts: 28,420 |
Maybe something in your steering cables......
😎 Dallas Cowboys....eventual Superbowl Champions 😎
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Re: Thump Question
[Re: bush hog]
#11397620
02/07/16 01:41 PM
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Joined: Oct 2007
Posts: 19,756
Huckleberry
TFF Guru
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TFF Guru
Joined: Oct 2007
Posts: 19,756 |
Keel gaurd coming loose ?
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Re: Thump Question
[Re: bush hog]
#11397639
02/07/16 01:53 PM
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Joined: Dec 2005
Posts: 1,462
Rube G.
Extreme Angler
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Extreme Angler
Joined: Dec 2005
Posts: 1,462 |
Check your prop shaft also.
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Re: Thump Question
[Re: bush hog]
#11398161
02/07/16 06:24 PM
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Joined: Jul 2011
Posts: 9,200
the skipper
TFF Celebrity
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TFF Celebrity
Joined: Jul 2011
Posts: 9,200 |
I'm going to say check your lower unit. I've had 2 go out on me and both times the only sign was in a turn you could hear a knock. Never going straight. Could be something going wrong down there
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Re: Thump Question
[Re: the skipper]
#11398891
02/08/16 12:54 AM
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Joined: Jun 2013
Posts: 3,155
bush hog
OP
TFF Team Angler
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OP
TFF Team Angler
Joined: Jun 2013
Posts: 3,155 |
I'm going to say check your lower unit. I've had 2 go out on me and both times the only sign was in a turn you could hear a knock. Never going straight. Could be something going wrong down there Thanks Skipper, I'll have it checked out.
To whom much is given, much is required.
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Re: Thump Question
[Re: the skipper]
#11398949
02/08/16 01:14 AM
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Joined: Feb 2009
Posts: 1,436
Squirrely Dan
Extreme Angler
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Extreme Angler
Joined: Feb 2009
Posts: 1,436 |
Fully sponsored by my mom
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Re: Thump Question
[Re: bush hog]
#11398970
02/08/16 01:21 AM
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Joined: Jun 2012
Posts: 1,390
Andrew Y'Barbo
Extreme Angler
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Extreme Angler
Joined: Jun 2012
Posts: 1,390 |
Pull the drain plug in the LU and check for shavings. If there isn't any, keep rocking until you get a chance to take it in. Boats have warranty and insurance for a reason.
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Re: Thump Question
[Re: bush hog]
#11398971
02/08/16 01:21 AM
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Joined: Nov 2014
Posts: 23,404
SteezMacQueen
TFF Guru
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TFF Guru
Joined: Nov 2014
Posts: 23,404 |
Sounds like cavitation to me too. By the description anyway. Could also be unsecured trolling motor cables running from back to front in the boat hull just banging round a little.
Eat. Sleep. Fish.
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Re: Thump Question
[Re: bush hog]
#11398990
02/08/16 01:28 AM
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Joined: Sep 2006
Posts: 12,449
JIM SR.
TFF Guru
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TFF Guru
Joined: Sep 2006
Posts: 12,449 |
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