Is the leak from the through hull

[jeanmarc109]

I was told my boat’s leak was from the keel/hull joint
At launch it looked like the water was coming in from around the second from rear keel bolt.
Put a month of labour and a fortune in materials sealing the joint from the outside and around the keel bolt from the inside.

im satisfied the keel joint is water tight

but when I launched her a second time, I could see the water was coming from the drain hole between the rear-most floor compartment )the one at the base of the companion way) and the bilge

I looked at all of the through hulls and none of them were visibly leaking ….

but I later realized that the through hull that leads from the bathroom sink seats on the inner liner (I never know the right way to describe the fiberglass reinforcing structure that runs “ribs” from side to side and front to back. They support the sole boards and are joined together by what u call the inner liner)

From the outside, through hull looks like it might let water passed it. Since it is seated in the liner and since the liner offers a direct line to the drainage hole no

my theory is that water is getting by the through hull then finds its way to the bilge between the liner and the hull

to test the theory I was plan I g on cutting away some of the liner then replace the through-hull but this time cinching the inside nut against hull instead of the liner

does that make sense ??

 

[Don S/V ILLusion]

This is one of those pesky problems difficult to diagnose by internet and impossible without pictures. The result is often well-meaning guesses my the participants here but not always helpful without a better understanding of all possible sources.

My suggestion- Barrie is full of marinas and boat yards and T isn’t far away such that you should be able to find a competent inspector or repair guy to actually look.

 

[JoeWhite]

Yes pictures will help. You may be right. Can you get a small camera below the liner and see if there is water there? If not go for a sail, then take an other look.

 

[jssailem]

cinching the inside nut against hull instead of the liner

I have no idea (as @Don S/V ILLusion points out) if the problem is as you identify.

Your plan to tighten the thru-hull to the hull, using caulk to ensure it is watertight, is spot on. If the thru-hull is tightened against the pan, it is most likely that the system is leaking.

If the thru-hull is secured to the pan (liner), not the hull, then you should correct this issue.