Replacing valves in Pakboat sponsons?

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tmeier
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Replacing valves in Pakboat sponsons?

Post by tmeier »

(I posted some of this in the introduction forum, but realize it might be better posed here.)

I am a new member to the forum, and we are trying to fix up an older Pakboat Puffin Saranac. All four boston valves in the sponsons have come unglued and fallen out.

I've tried reaching out to Pakboat via mail and phone, with no luck yet.

I've purchased replacement boston valves. These have what looks to be a vinyl flange around a base piece. I am assuming, for this repair, that one would use a cement (like HH-66) to attach the flange to the exterior surface of the sponson material. But I welcome all advice on how to attempt a repair like this!

Here's a picture of the valves that I have: https://drive.google.com/file/d/1EY0aI- ... sp=sharing

And here's a picture of two of sponsons with the valve holes: https://drive.google.com/file/d/1eNXCoy ... sp=sharing

Thanks in advance for guidance/cautions, etc.

geoffrose
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Re: Replacing valves in Pakboat sponsons?

Post by geoffrose »

Just posted on this. I have the same valves and they work perfectly. Go to this exchange from a week ago and look at my posting.
http://foldingkayaks.org/phpBB/viewtopi ... =11&t=9324

tmeier
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Re: Replacing valves in Pakboat sponsons?

Post by tmeier »

Cheers--I will take a look! Thanks for the lead.

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KerryOnKayaks
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Re: Replacing valves in Pakboat sponsons?

Post by KerryOnKayaks »

I recommended to Alv at Pakboat several years ago that they sell replacement valves already glued onto oversized patches of the sponson vinyl so that defective valves could be cut out of the sponsons and the new ones glued overlapping the resulting hole.

If you have difficulty inserting and glueing the flanges on the Boston valves, is would recommend trying this yourself. I did it with valves I ordered from DIYpackraft.com to reconstruct some defective sponsons for a Pakboat Swift. Cut a large circular patch (a couple of inches larger diameter than the valve) and then cut a smaller hole just large enough to fit it over the neck of the valve flange. Glue the patch to the valve and once the adhesive cures, glue the patch over the hole in the sponson that you have cut the old defective one out of. I think this is easier.
CURRENT FLEET:
Feathercraft Wisper
Feathercraft Java
Pakboat Quest 135
Pakboat Puffin 12
Pakboat Swift 14
PREVIOUSLY OWNED:
Feathercraft Kahuna
Feathercraft K-1 Expedition
Pakboat XT-15

tmeier
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Joined: Wed Sep 08, 2021 12:09 am
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Re: Replacing valves in Pakboat sponsons?

Post by tmeier »

Thanks KerryOnKayaks! This makes sense, and an oversized top-patch is likely a next step. Here's a couple pictures of how this repair turned out--I ended up trying to build up a layer of HH-66 around the flange after cementing them to the sponson, for seal insurance. I had to cut the sponsons slightly larger to accept the new boston valves. So far, so good, but I haven't tested much. This is a "new to us" boat, so I also have patched some small holes in the skin, too. But: it floats! Thanks all for the advice.

https://drive.google.com/file/d/19aXLrH ... sp=sharing

https://drive.google.com/file/d/1Djzftb ... sp=sharing

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KerryOnKayaks
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Re: Replacing valves in Pakboat sponsons?

Post by KerryOnKayaks »

Thanks for posting those pics. I always like to see the configuration of older models of Pakboats. I was unaware that they made the Arrow model recently enough that it has the bow and stern caps that yours shows. I had bought a surplus Arrow full deck from Pakboat a few years ago to replace a badly stained and worn deck on my 2004 Puffin 12. It was exactly 3" too short for the Puffin but I spliced an extension into it was successful in fitting it perfectly to that boat.

I am curious as to what year your Arrow is (the last two digits of the serial number on the hull skin will tell you that. I bought a pair of 2007 vintage PB Swift 14's 5 years ago which had exactly the same seat and dual sponsons as your boats. But both the sponsons and the seats had failed due to a bad batch of defective fabric that PB got that year. They had a replacement recall but not all owners were aware of it. In the case of the pair of boats I bought the original owners had recieved them as a wedding gift and failed to register the warranties so they missed having the defective inflatable parts replaced.

I thought I had gotten a great deal ($300 each for boats that looked pristine!) until I got them home and set them up and discovered that the sponsons and seats would slowly lose air within an hour or less. I filled my bathtub to immerse the sponsons and seats to detect leaks and was shocked to see that the entire surface of the fabric was leaking tiny bubbles. Apparently the subcontractor who made the components for Pakboat had used a fabric with the wrong kind of coating which would delaminate over time. Even the heat sealed divider seams in the sponson were failing and splitting as the urethane coating detached from the nylon fabric.

I located some liquid latex sealant that is used to plug pinhole leaks in rubber rafts and dories and tried that. I discovered that the latex bubbled through all over large areas of the seats and sponsons. I have photos showing how vast the failure was in the fabric. It did seem to effectively seal one of the seats but I really don't trust it. Completely did not work on the sponsons so I bought the valves and new fabric to make new ones. Don't know what I will do about replacing the seats since they are no longer available from PB since they switched all models to the sling plus back band design.

Just saying, if you have a 2007 boat it may have some of the same defective fabric.
CURRENT FLEET:
Feathercraft Wisper
Feathercraft Java
Pakboat Quest 135
Pakboat Puffin 12
Pakboat Swift 14
PREVIOUSLY OWNED:
Feathercraft Kahuna
Feathercraft K-1 Expedition
Pakboat XT-15

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