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 Rebedding Nylon Thru Hull		  New Topic  Topic Locked
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dblitz
Navigator

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240 Posts
Initially Posted - 04/17/2006 :  09:32:10  Show Profile
In the course of cleaning and painting yesterday, I noticed that the nylon (is it nylon?) thru hull on the port side of the transom (which I think is the bilge pump discharge, have to check) is loose.
The question is, if I unscrew the outside part enough to put caulk underneath will the job be done? OR:
Is it necessary to unscrew completely to fill the whole underside of the part with caulk?
Should I use polysulfide for this job?
If I can just loosen, will it tighten back up by just screwing from the outside or is it a two man job for somebody to be in the depths of the locker holding the inside part so it doesn't turn?
Also, don't think I ever saw a special tool for screwing this part down with a slot on either side of the hole. Is there a special tool for this?
Thank you all as always
Daniel 86 "Solar Wind" #5339 C-25 FK/SR I/B Diesel
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 04/17/2006 :  10:14:11  Show Profile  Visit Leon Sisson's Homepage
Dan,

If this is a typical hard plastic thru-hull, there's likely a hose clamped to the inboard end and a nut. If so, you'll have to remove the hose before turning the exposed head of the thru-hull. Or you might get away with just loosening the nut from the inside, pushing the thru-hull out a fraction of an inch, and carefully working some sealant under the flange of the head from outside of the boat, then retightening the nut.

If the thru-hull is near or below the waterline, I'd be a bit more thorough about it, by completely removing the thru-hull, carefully inspecting it for cracks, cleaning all old sealant from the parts and hole, then reassembling with fresh sealant and two new hose clamps.

As I recall, polysulfide is specifically <b>NOT</b> reccommended for use with plastics. Silicone would be my choice here. Others might also suggest polyurethane.

-- Leon Sisson
Edited by - Leon Sisson on 04/17/2006 10:17:47
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/17/2006 :  11:42:31  Show Profile
Or you can use a silicone/polyurethane hybrid such as BoatLife's Life Seal.
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StSimon
Captain

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USA
298 Posts
Response Posted - 04/17/2006 :  18:18:10  Show Profile
FWIW, I use 4200 above the waterline and 5200 below.

Thr through hull you are describing should be for the manual bilge pump unless someone has rearranged the plumbing. I just replaced mine. I had a friend hold it still with two large screwdrivers while I tightened the locking nut from the rear berth. It had been removed while I repaired and applied new gel coat to the rensom after upgrading the ladder to a swim platform/ladder combination. The original holes were filled and new holes were drilled. Well, I cracked the thru hull from overtightening. The plastic was brittle from age. After a quick trip to WM I replaced it with a new one.

You asked about removing it or just squeezing some sealant under it. If it were me I would remove it and clean all the old sealant. It seems to me that you might have voids doing it the other way. I would pull it, scrape of the old sealant, apply a liberal amount of 4200, then replace it. You can wipe off the excess 4200 after tightening the lock nut.

Don't forget to NOT overtighten the lock nut!!

Good luck and...
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dblitz
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240 Posts
Response Posted - 04/17/2006 :  18:48:11  Show Profile
My boat has an inboard so I guess I'll have get into the locker to tighten it. Do I need to let the lifeseal setup for a week before I tighten it down.
Here I thought I was finally down to the polishing, spiffing up stage, oh well.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.