CD TYPHOON THRU HULLS

[Tom Tucker]

I am refurbishing the thru hulls on my TYPHOON. As I tightened the locknut on the thru hull I felt the hull liner depress. I was already concerned that the thru hull locknuts were set up against the hull liner vice a backing plate attached directly to the hull. That concern has now been greatly increased as I can imagine any movement between the hull liner and the hull having the potential to eventually create a leak around the thru hull.
I would greatly appreciate any comments:
1. Is my concern ill founded?
2. If not, what is the best way to fix the problem?

My only idea so far has been to cut a big enough hole in the hull liner that I could add a backing plate to the hull and tighten the thru hull locking nut directly against the backing plate.

I have also considered glassing over the thru hull holes and living with the inconvenience of bailing rain water out of the bilge. My problem with this is what might happen if I took a wave in the cockpit while off shore or transiting the St. Augustine inlet.

Any comments will be greatly appreciated.

Tom
_________________
Tom

Back to top

[John Ring]

Tom,

You need to get the liner out of there. The locknut (or valve depending on installation) has to be right up against the hull.

You need to cut the liner away, but this isn't too hard to do. I cut the liner away using a cordless drill and a 1/4" drill bit, drilling a series of holes very close to each other then popped the liner out with a screw driver. If you drill the holes as close as possible, the liner will pop out pretty easily and you won't have nearly as much dust as cuting would generate. I used a hand rasp so smooth out the ragged looking edge afterward.

If you look at this picture, you can see the valve (locknut in your case) is sitting on a spacer that sits on the inside of the hull. I just filled the gap between the hull and liner then painted it to look nice and show any water in case of a leak.

Best,
John Ring
CD28 Tantalus

You can see more of how I set up thru-hulls and valves here: http://www.yachttantalus.com/head.htm

[img]http://www.yachttantalus.com/Tantalus%2 ... 20File.jpg[/img]

[Neil Gordon]

I have also considered glassing over the thru hull holes and living with the inconvenience of bailing rain water out of the bilge.

Holes in the boat are good or bad, depending on whether the water is going out or comind in through the hole. The risk that a through hull and seacock fails is fairly low, although the risk of the hose failing is higher. The failure is easily fixed by closing the seacock (of you are there). On the other hand, if the boat is pooped you might have other things to do beside bail. I'd keep the drains (and an automatic bilge pump for whatever gets into the bilge).

[winthrop]

HI Tom...

my first question is what year is your ty

you see when i did the thru hull fittings there was no inside hull there at all (on my 75).

i just removed the old ones (2) and put a new ones in its place,
and thats that.

using 3M 4200 with it on both sides of the hull (inside and out).

i don't see any problems leaving the inter hull there
and just put the thru hull fitting right where it was before.

it was put there why changes it

you don't need too.

i have told allot of people how to do it many times over and besides they never had any proplems at all after that.

if the first set lasted over 25 years, yours will last just as long.

winthrop

I am refurbishing the thru hulls on my TYPHOON. As I tightened the locknut on the thru hull I felt the hull liner depress. I was already concerned that the thru hull locknuts were set up against the hull liner vice a backing plate attached directly to the hull. That concern has now been greatly increased as I can imagine any movement between the hull liner and the hull having the potential to eventually create a leak around the thru hull.
I would greatly appreciate any comments:
1. Is my concern ill founded?
2. If not, what is the best way to fix the problem?

My only idea so far has been to cut a big enough hole in the hull liner that I could add a backing plate to the hull and tighten the thru hull locking nut directly against the backing plate.

I have also considered glassing over the thru hull holes and living with the inconvenience of bailing rain water out of the bilge. My problem with this is what might happen if I took a wave in the cockpit while off shore or transiting the St. Augustine inlet.

Any comments will be greatly appreciated.

Tom
_________________
Tom

Back to top