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Drilling and installing thru hull transducer questions

Old 11-17-2016, 07:02 PM
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Default Drilling and installing thru hull transducer questions

What is the best way to drill/install a flush thru hull transducer on a 2005 23 Regulator? I will place it on the SB side mirroring the position of the thru hull pick up on the port side. I am just not sure of the proper way to drill, prep the hole, prep the underside (it has a thin layer of ablative paint on it) and seal the hole. Also, how tight should the nut (for the transducer) be tightened? Lastly, what is the best way to fill the holes from the transom mount transducer that I will be replacing.

Thanks
Old 11-17-2016, 08:06 PM
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Originally Posted by Scott1115 View Post
1) What is the best way to drill/install a flush thru hull transducer on a 2005 23 Regulator?

I will place it on the SB side mirroring the position of the thru hull pick up on the port
side.

2) I am just not sure of the proper way to drill, prep the hole, prep the underside (it has a
thin layer of ablative paint on it) and seal the hole.

3) Also, how tight should the nut (for the transducer) be tightened?

4) Lastly, what is the best way to fill the holes from the transom mount transducer that I
will be replacing.

Thanks


OP, What's your dead rise?

Make sure you have your ducer pointing in the correct direction.


To answer your questions,

1) Make sure you have plenty of access where your drilling.
When drilling from inside/out, make "Sure" you know exactly where your drilling and
where you'll end up on the bottom.

2) Electric or Cordless Drill.
Make sure to use the "Correct" size hole saw.
I measure everything, 2x.

Mark the spot, say a prayer and drill away.

3) Your install instructions should have that info.

I strongly suggest you purchase the "double handled" ducer wrench. (This one is for the nut.)

You'll also need to purchase a second ducer wrench as well to hold the ducer itself.

You don't want the ducer to spin while tightening.

Lightly grind the inside and outside rim of the cut out hole.

Thoroughly clean all surfaces with solvent and clean rags.

3M 4200 Adhesive/Sealant.

4) Best way to fix any hole in a fiberglass tub is to prep & apply new fiberglass/resin.
This will require of you to grind down through the gel and into your glass providing a
good mechanical substrate for the new glass to bond to.


You'll get plenty of recommendations to say the least.........


Have fun &

THIS THREAD IS WORTHLESS WITHOUT PICS

Last edited by Riptied; 11-17-2016 at 08:17 PM.
Old 11-17-2016, 08:39 PM
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Default Couple of good install videos from BOE marine


Old 11-18-2016, 06:56 AM
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Thanks folks. I will post pics when I am back at boat and along the way as I do my project.
Old 11-18-2016, 05:30 PM
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Just did this this spring. Be sure to sand off bottom paint where the transducer will rest. Also I used a liberal amount of 4200 and tightened it down pretty tight. As said above be sure to keep a hold on it while tightening it down. The arrow needs to stay pointed to the keel. After a day or two I went back and really tightened it down. It can be messy so I had a buddy under the boat wiping it as I tightened. Also I found a small filter stlyle wrench helped get in if it's a tight spot.

Oh and make sure you use the right hole saw and be sure ( very very sure) you know where the hole will be. I was nervous about hitting a strake. I must have checked and rechecked 10 times.
Old 11-19-2016, 06:08 AM
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Once you measure it and decide where you're going to place it. Drill a 1/8 inch or so hole through the hull in the center of the selected spot. Then take your hole saw inside the hull and place onto the small drilled hole. This will confirm everything is good before drilling the large cutout. if something is a little off, you can adjust slightly and the 1/8 drilled hole will come out with the plug. Just an easy way to reconfirm clearances etc. before making the final cut.
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Old 11-19-2016, 06:25 AM
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sub
Old 11-19-2016, 07:03 AM
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Originally Posted by Riptied View Post
OP, What's your dead rise?

Make sure you have your ducer pointing in the correct direction.


To answer your questions,

1) Make sure you have plenty of access where your drilling.
When drilling from inside/out, make "Sure" you know exactly where your drilling and
where you'll end up on the bottom.

2) Electric or Cordless Drill.
Make sure to use the "Correct" size hole saw.
I measure everything, 2x.

Mark the spot, say a prayer and drill away.

3) Your install instructions should have that info.

I strongly suggest you purchase the "double handled" ducer wrench. (This one is for the nut.)

You'll also need to purchase a second ducer wrench as well to hold the ducer itself.

You don't want the ducer to spin while tightening.

Lightly grind the inside and outside rim of the cut out hole.

Thoroughly clean all surfaces with solvent and clean rags.

3M 4200 Adhesive/Sealant.

4) Best way to fix any hole in a fiberglass tub is to prep & apply new fiberglass/resin.
This will require of you to grind down through the gel and into your glass providing a
good mechanical substrate for the new glass to bond to.


You'll get plenty of recommendations to say the least.........


Have fun &

THIS THREAD IS WORTHLESS WITHOUT PICS
Agree with this but my preference is to drill from the outside so you don't crack any gelcoat on the outside of the hole. You'll be using a hole saw so if it were me once you get the pilot bit through stop. Then double check on the inside to make sure your location works. It's easier to change the pilot hole location before you drill the main hole.

Then run the drill backwards to penetrate the gelcoat then switch back to forward to go through the fiberglass. If you're anal like me you can stop and drill about 20% of the thickness from the inside so that doesn't splinter when the drill go through.
Old 11-19-2016, 12:59 PM
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Originally Posted by UWHunter View Post
Once you measure it and decide where you're going to place it. Drill a 1/8 inch or so hole through the hull in the center of the selected spot. Then take your hole saw inside the hull and place onto the small drilled hole. This will confirm everything is good before drilling the large cutout. if something is a little off, you can adjust slightly and the 1/8 drilled hole will come out with the plug. Just an easy way to reconfirm clearances etc. before making the final cut.
Excellent advice!
Old 11-19-2016, 04:44 PM
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Thank you everyone
Old 11-19-2016, 05:20 PM
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This...

Showed this new guy everything I needed to do the job.
Old 05-19-2020, 05:36 AM
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Bumping this - i am a noob and installed my thru hull this weekend with the help of the friend. The BOE marine videos were a big help and i think once i got past the intimidation factor of drilling through the hull it came out pretty good. My only (somewhat) regret is that i followed the airmar instructions as to the inside portion of the installation. What airmar recommends (see detail) is that the 4200/5200 be applied to the flange and up the shaft, to 1/4" above the top of the nut. That's what i did, pretty liberally. In the BOE video they shmutz the 4200 underneath the rubber gasket before installing the nut. i'm sure i have some sealant under there from squeezing up from the flange and down the shaft but it didn't "ooze out" on the inside as a result. i contemplated undoing the nut and confirming or putting some underneath there but honestly the install i thought went really well and smooth and is very clean (i baseically detailed the bilge before i started) on the inside and outside and i didnt want to screw it up. The nut is also really secure because of the 4200 i put on the shaft and is locked in place. i went hand tight plus 1/4 turn with a wrench - the gasket has just a slight "smush" to it. i tried to budge it with my hand yesterday and its solid. i dont want to break the 4200 bond on the nut either. I guess i'm just looking for some reassurance from the members here that i should leave "well enough alone" lol. the outside flange has a real nice, even bead of 4200 as you can see in the photo. i know that you could always use more 4200 because it "can't hurt" but i also think i should be adequate by following the recommended detail. Thanks in advance.





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