Installing through hull fittings

[Bob_45]

Hello to all

I am wondering if anyone perhaps can give me some assistance here. I have a 1988 Carver 3607 and plan to put 2 new through hulls in this spring. One will be just to the side of the keel near the engines and one will be forward above the water line. Yep, I'm getting reverse heat air and want to do this work myself.

The big question I have is, When the hull at the keel is laid up by Carver, do they use solid glass OR do they use a core filler like balsa. If the latter, I plan on digging some core out around the holes and re-filling with thickened epoxy, let it set and then drill hole again. Then bed through hull in lots of 5200 inside and out. I plan to have someone on the outside when installing through hull.
Below water line through hull will be brass and above waterline will be plastic.

I can't find a definate answer anywhere and thought one of you folks might have the experience. Me, I am a rookie at through hulls.

Thanks in advance

Bob

 

[Up the Creek]

Bob, We have a 1989 3607 and I was told the bottom is solid with cored above the waterline. I have modified and changed several thru hulls on other boats and used 5200 for the seal material. I would use some epoxy for the area around the cored material clean out. One important part to the installation is when installing the thru hull fitting with 5200, do not over tighten on the first day. Tighten good but do not squeeze all the sealant out by over tightening. Come back 24 hours or so and tighten again but be very careful not to turn the fitting in this process. We have 3 ac units on our 36 if you need additional info.

Rod