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Max Online: 36273 @ 01/23/13 02:34 PM
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#11397348 - 02/06/16 09:57 PM Thump Question
bush hog Offline
Extreme Angler

Registered: 06/12/13
Posts: 2124
Loc: Beckville, TX
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.

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#11397365 - 02/06/16 10:08 PM Re: Thump Question [Re: bush hog]
David Burton Offline
Extreme Angler

Registered: 07/14/11
Posts: 1751
Loc: McKinney, TX
Do you have Power Poles or Talons that could catch water in the turn?
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2015 Skeeter FX 21


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#11397461 - 02/06/16 11:44 PM Re: Thump Question [Re: bush hog]
Garvin Offline
Angler

Registered: 11/11/14
Posts: 342
Loc: Texas
Have you ever discovered your fishing buddy missing right at that moment?
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#11397518 - 02/07/16 05:36 AM Re: Thump Question [Re: bush hog]
fitter2259 Offline
TFF Celebrity

Registered: 12/29/11
Posts: 5687
Loc: Humble, Texas
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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#11397527 - 02/07/16 05:47 AM Re: Thump Question [Re: Garvin]
Lee in Texas Offline
TFF Celebrity

Registered: 03/23/13
Posts: 9006
Loc: Wise County Texas
Originally Posted By: Garvin
Have you ever discovered your fishing buddy missing right at that moment?

roflmao roflmao roflmao

God Bless
Lee
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#11397601 - 02/07/16 07:25 AM Re: Thump Question [Re: bush hog]
bush hog Offline
Extreme Angler

Registered: 06/12/13
Posts: 2124
Loc: Beckville, TX
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.

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#11397617 - 02/07/16 07:39 AM Re: Thump Question [Re: bush hog]
Okie Poke Online   happy
TFF Guru

Registered: 02/28/04
Posts: 15563
Loc: Flower Mound, TX
Maybe something in your steering cables......
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#11397620 - 02/07/16 07:41 AM Re: Thump Question [Re: bush hog]
Huckleberry Offline
TFF Guru

Registered: 10/10/07
Posts: 16985
Loc: Lake Gaston, VA
Keel gaurd coming loose ?

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#11397639 - 02/07/16 07:53 AM Re: Thump Question [Re: bush hog]
Rube G. Offline
Pro Angler

Registered: 12/04/05
Posts: 729
Loc: Lone Oak,TX
Check your prop shaft also.

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#11398161 - 02/07/16 12:24 PM Re: Thump Question [Re: bush hog]
the skipper Offline
Extreme Angler

Registered: 07/04/11
Posts: 2157
Loc: nederland, TX
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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#11398891 - 02/07/16 06:54 PM Re: Thump Question [Re: the skipper]
bush hog Offline
Extreme Angler

Registered: 06/12/13
Posts: 2124
Loc: Beckville, TX
Originally Posted By: the skipper
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.

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#11398949 - 02/07/16 07:14 PM Re: Thump Question [Re: the skipper]
Im RICK JAMES Offline
Pro Angler

Registered: 02/13/09
Posts: 939
Loc: Alvord,tx
Same here
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#11398970 - 02/07/16 07:21 PM Re: Thump Question [Re: bush hog]
Andrew Y'Barbo Offline
Extreme Angler

Registered: 06/25/12
Posts: 1255
Loc: Lufkin Texas
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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#11398971 - 02/07/16 07:21 PM Re: Thump Question [Re: bush hog]
SteezMacQueen Online   sleepy
TFF Team Angler

Registered: 11/02/14
Posts: 3764
Loc: Red Oak, Galveston, and Pagosa...
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.
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#11398990 - 02/07/16 07:28 PM Re: Thump Question [Re: bush hog]
JIM SR. Offline
TFF Celebrity

Registered: 09/25/06
Posts: 6603
Loc: NRH/Fork again ! GET THE NET
battery bounce..

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