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Old 03-20-2017, 06:04 PM   #1
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Default need advice - Thru-hull transducer problem

My problem, I have a Lockley-Newport sailboat (LN23). I just removed an old thru-hull. I planned to install an Airmar P319 transducer for my new GPS. I thought the current thru-hull was less than 2 inches in diameter and i would have to enlarge the hole. Now that its out I realize it is 2 1/8 inches (54mm?) instead of the 2inch (51mm?) hole that the Transducer instructions call for. I put the transducer in the hole and of course there is a little wiggle room on each side. Also the hole has a beveled edge, this model Transducer doesn't it just has a flat head (lip?) without any bevel.

Should i be alright to install it with a liberal amount of adhesive? Or will the extra 1/8 of an inch extra diameter cause problems later? If so what else can i do? having someone fill the hole to redrill would be my last option.

I plan to use 3m 4200 fast cure adhesive to install the new transducer

Thank you
Trailer Sailor LN23

Last edited by sail LN23; 03-21-2017 at 06:04 AM. Reason: added more info
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Old 03-21-2017, 03:03 AM   #2
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not a fiberglass guy so I would have to do much more research to give the right product.

I was always under the impression the proper way to do a through hull was to make the hole a little bigger. This will leave room for you to seal the exposed fiberglass. Redrill the hole the required size.

Sounds to me, seal of the fiberglass with the appropriate product and redrill and you are good to go.
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Old 03-21-2017, 03:25 AM   #3
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Is your hull solid glass? If so you will be fine. Just sand the outside pretty good to remove the bottom paint and inside bilge paint and then load up the 4200... inside and out btw....
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Old 03-21-2017, 05:59 AM   #4
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Thank you for the replies. Yes my hull is solid glass. i triec to put a 2 1/8 hole saw in the hole it doesnt go in teeth first but does go in back first so maybe its slightly less.

The only thing im still concerned with now is the beveled edge on the hole. less surface for the transducer head to contact. it liks like over half of the transducer head (lip?) Will contact glass. i would think with a liberal amount of 4200 inside and out it will be fine but it is a boat with a thru hull after all so looking to those with more experience in these matters

Thank you

Last edited by sail LN23; 03-21-2017 at 06:02 AM. Reason: more info
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