Wallas Thru Hull

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Lynn Marie

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C Dory Year
1997
C Dory Model
22 Cruiser
Last season I found water in the cabin a couple of times and after thinking it was leaking around the door or through some other normal space I discovered that if I had water up the starboard side there was a small trickle of water coming in around the Wallas thru hull fitting. Guess that heat or something else has created an unprotected area between hull and fitting so I want to take it out and re-install with a new batch of sealant. My question is what to use to re-calk the fitting. Does anyone know what the factory uses or even better what the Wallas folks recommend?

Thanks in advance for the input,

Tim
 
Tim, when I installed the fitting on Little Buddy it came with a high temp cork like material that compressed when you tighten up the screws. You may just need to tighten it or I think Scan Marine can get you a new gasket.

Fred
 
go to the local auto parts store and buy some high temp RTV
 
Hey Tim, My thru-hull starting leaking too. Evidently the cork gasket lost its resiliency. I created a new one out of an old automobile inner-tube I had laying around. I left the original cork gasket in its recess so the rubber one rides a little "proud". The flange has a sharp edge that I did'nt want to mar the hull. Doubled cork would have worked good too. Pete
 
I forgot to add that I did'nt use any sealants on the original install or the refurb either.
 
Tim -

How about this Gore-Tex Joint Sealant stuff? It says it's good to 600ºF. The highest temp on the Wallas exhaust I found was around 400º.

This stuff is a molded PTFE (like I know what that is), and comes in strips of a few different widths. It has an adhesive peel-and-stick strip on the back side to hold it in place for assembly. The cool part is, I just happen to have about a foot of the 1/2" wide stuff in my shirt pocket right now. Yeah - no kidding. I'll stick it in a baggie and set it on the boat trailer tongue just in case you want to try it.

If you really want hot-proof, I bet I can find some steam valve packing that would seal it up, too.
 
Why sure, PTFE is polytetrafluoroethylene. Everybody knows that. It's also known as Teflon.

It's on the trailer tongue already.

All I know is that each time we get a new mill manager, we do a massive million-of-dollars-to-the-junk-pile cleanup, and I snagged up a few feet of this stuff a long time ago to make MGB valve cover gaskets. Don't remember how it worked for that, but I have sealed up a whole bunch of stuff at work with it.

If I ever get a new boat, I think Polytetrafluoroethylene would make a great name. Lets see old Rev. Dave spit that one out after a couple beers!
 
This stuff is a molded PTFE (like I know what that is)
Click to expand...
I think it's Teflon.
 
Mike,

Between your job and the Gizmo shop I'm not sure I'll ever need West Marine. Englunds, yes cuase they sell cool fish stuff. The baggie sounds great but it may be the week-end before I get there.

Having a dry boat ALL the time is important. Also started on my main cabin ceiling carpet project and that should keep things dry from the top side. Need to get the bunk of the TyBoo cleaned out so we can use some of this warm fuzzy scap in there before the cruising season starts.

Tim
 
Speaking of jobs, Tim, I just this weekend used that insulation stuff you gave me last year. I built a cabinet to go under the galley, and covered the top of it with the insulation. I stapled it on foil side up. Is that right?

I was concerned about the stove getting too warm on the underside with the cabinet top being just a couple inches below it, but using an infrared laser thermometer to watch it, there is no heat build up at all under there. I recently added a large area screened vent to the galley front, and also raised the stove up almost 1" to get the fan to blow over the top of the teak strip on the front of the counter instead of directly onto it. I ran the stove for several hours yesterday, and watched the temps. No problems. If you want to borrow that thermometer to check anything, I'll have it around home for a while yet. I do have to eventually take it back to work, though. By the way - 867º is the hottest spot I can find on the ceramic stove top.

I have been doing a bunch of other stuff inside lately, too. In fact, the drawers for that under galley cab are sitting on poor old Kay's dryer right now stinking up the laundry room with the smell of fresh stain. I'll have to give you a tour of the latest if you stop by next weekend. Don't expect to get in the front just yet, though.
 
TyBoo":2fbmph6h said:
If I ever get a new boat, I think Polytetrafluoroethylene would make a great name. Lets see old Rev. Dave spit that one out after a couple beers!
Click to expand...

No sweat pronouncing that in a sober condition, but I'll betcha I can't say it after just one of those huge bottles of beer that the "Brewsky Bros" market!.......anyhow, I ain't worried yet 'cause so far C-Dory hasn't manufactured a boat long enough to apply that name on to it :crook.

(Just watch, that being said they'll probably come out with a 52' C-Dory next week :disgust .)_

(Good name for a kitty cat... :roll: )
 
Mike,

Foil side out for the insulation is correct. Sounds like a good use for the stuff and I'll make sure to stop by and take a look. Think I'll be by sometime mid to late morning after a trip to the Astoria transfer station.

Tim
 
Lynn Marie":26r2ptwn said:
Think I'll be by sometime mid to late morning after a trip to the Astoria transfer station.
Click to expand...

Tim - I have to take Tiff to 4H at 9:00, and Jamie asked me real nice to take her to the doughnut store. So it may be noon before I am back home. That teflon stuff is still on the trailer tongue if you don't catch me. If you're in Astoria around 9:30, you might catch us at Home Bakery.

I checked the Wallas exhaust temp again, and the hottest spot I could find anywhere near the thru-hull flange was under 300º. That stuff should be fine. It is kinda mushy, like a stale marshmellow, so it will conform and seal real well.
 
I have had success using MarineTex for leaks on sections of a large heat exchanger that can't be removed without the use of a crane. It can withstand the temp. (water goes in as steam and comes out as hot water) It goes on like thick peanut butter and hardens like a rock. Never tried to remove the stuff though.
 
Wallas recommends silicone in addition to the gasket for the installation of what they call the "leadthrough" (thru hull). The West Marine silicone claims it's good to 480F.
http://www.wallas.fi/pdf/leadthrough.pdf
 
Guys and gals, I'm a newbie here, but I can add a bit to the discussion.

Permatex makes a silicone type sealant called Ultra Copper Hi-Temp Silicone Gasket. Part No. is 101B. Comes in a 3 oz. copper colored tube.

Rated for 650 degrees F. Water and oil proof. Low odor. Non corrosive. Safe on aluminum. I think the tube in front of me cost about 5 or 6 bucks.

I have used it for years on header pipes on motorcycles. It takes the heat and lasts.

It's a sticky mastic kind of stuff, so don't get it where it does not belong. :lol:

To me, this stuff looks like it might work for that kind of repair.
 
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