Jump to content
CarlF

Best method for filling hole from thru hull?

Recommended Posts

I just finished pulling all the old lowrance equipment off of my bass boat, and Im left with a hole in the hull where the old flush mount transducer use to be. I know that I could just fiberglass the hole and permanently fill it, but I'm wondering if anyone has come up with another way to do it? A plug of some sort would be nice, in case I ever sell the boat or decide to get the flush mount Humminbird transducer.

Any ideas?

Share this post


Link to post
Share on other sites

I doubt a plug could stand up to the pressure while running. I would have it fiberglassed or have left the transducer in place.l

Share this post


Link to post
Share on other sites

I pulled the transducer. Selling the whole setup to a fishing buddy.

Share this post


Link to post
Share on other sites

another vote for leaving it in place.  Drop the price of the unit so he can buy a new transducer.

Share this post


Link to post
Share on other sites

How thick is the hull at the site of the transducer?

 

Here's a simple solution that can easily be undone to install a transducer.

 

Image result for through hull fittings

Get one of these through hull fittings.  They are available in several sizes.  To install it, put a 1/4" bead of silicone on the flange.  Then snug the fitting against the hull until the silicone starts to ooze around the edges, and let it sit for a day or so until it is thoroughly set.  Use a finger to remove, and smooth the excess silicone.

 

Then, once set, you can tighten it down without the silicone oozing out.  Once installed, you can cap the threaded end.  Those are not pipe threads, but for what you are doing, it will work.  Get the appropriate size cap, wrap the threads with Teflon tape, and screw the cap on tightly.  Put the boat in the water, and check for leaks.

 

It will be a clean, simple, install, and uninstall.

  • Like 1

Share this post


Link to post
Share on other sites
15 minutes ago, Fishing Rhino said:

How thick is the hull at the site of the transducer?

Ill have to measure when I get home, but if I remember correctly, its a circular hole with a 2" diameter. The fiberglass is about an inch thick. Again this is a rough approximation.

Share this post


Link to post
Share on other sites

You could have a machine shop make you a dummy TD from aluminum or brass using 2 -16UN OD thread, washer and jam nut, about 1 1/2" long. I did this decades ago and it works. I used a O-ring design but 3M 5200 sealant would work and easier to make the plug.

Tom

  • Like 2

Share this post


Link to post
Share on other sites

You should be able to replicate the transducer face out of polycarbonate and just use some 100% silicone.  I would go with some material about 1/4 thick or even 3/8ths.  The materail works well with wood tools like a router.  

  • Like 2

Share this post


Link to post
Share on other sites
On 1/11/2018 at 11:00 AM, fishnkamp said:

I doubt a plug could stand up to the pressure while running. I would have it fiberglassed or have left the transducer in place.l

This^.

Share this post


Link to post
Share on other sites
 

 

Get one of these through hull fittings.  They are available in several sizes.  To install it, put a 1/4" bead of silicone on the flange.  Then snug the fitting against the hull until the silicone starts to ooze around the edges, and let it sit for a day or so until it is thoroughly set.  Use a finger to remove, and smooth the excess silicone.

 

Then, once set, you can tighten it down without the silicone oozing out.  Once installed, you can cap the threaded end.  Those are not pipe threads, but for what you are doing, it will work.  Get the appropriate size cap, wrap the threads with Teflon tape, and screw the cap on tightly.  Put the boat in the water, and check for leaks.

 

It will be a clean, simple, install, and uninstall.

This is perfect. Im going to give this a shot and let you know how it goes.

Share this post


Link to post
Share on other sites

Just for clarification.  Remove the extra ooze out before it sets.  You should end up with a 1/16th to a 1/8th inch thickness of silicone.  If you tighten it too much before it sets, it might end up leaking.  What you are doing is making a silicone washer.  Once it sets, you can compress it for a watertight assembly. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • fishing

    bass fishing

    fishing forum

    fishing rods

    fishing rods

    fishing rods


    fishing rods

    fishing reels

    bass fish

    fishing poles

    Truck Caps

    fishing reels
    fishing reels

    fishing

    bass fish

    fish for bass
    fish

×