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Old 05-28-2013, 01:15 PM   #1
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Black Water Tank Valve Adapter Broke!!!

OK, so here is the deal. I was impatient attempting to remove the Black Water Tank in a Subfloor replacement in out 1976 Argosy 22. I yanked a bit too hard and cracked off the female threaded area of the valve adapter.

I ordered a new one: Waste tank slip-in adaptor 0310107 [0310107] - $6.95 : Out-of-Doors Mart!, More Airstream Parts on-line than anyone!

Here is the problem. The tank is Polyethylene, I believe, and the valve adapter is held on by slipping into the opening of the tank and then some very hard black goo stuff... How can I remove this? Is there something to dissolve the goo or do I need to just cut it off?

Should I use the same method to attach the new part? Also, should I replace anything else just for the heck of it since it is open now? I really don t want to open this again...

Thanks for any advice!
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Old 05-30-2013, 07:56 PM   #2
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Update

So I ended up scraping the black goo off the outer edge by hand. Then I tried with all my might to separate the adapter from the tank with no luck. So I used a Sawsall with a fine metal blade to saw off the adapter. The new adapter fits nicely into place.

I plan to use ABS Cement and a ABS Coupling to marry to the 2 pieces together. And then I will use some Vaulkem to cover all remaining hole-like areas to make sure we have no leaks...

Does that sound like a solid plan? Anyone have anything to chime in with?
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Old 05-30-2013, 08:45 PM   #3
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Use a heat gun on the tank flange. That's what I did to remove the pipe from the tank in my 77 Argosy. I also heated the tank flange when I re installed the pipe into the tank and clamped it. It looks like someone has cut off most of the tank flange already, mine was about 3 inches long with a hose clamp around it to make the connection water tight.
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Old 05-31-2013, 12:06 AM   #4
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My Solution

I went tonight and picked up an ABS Coupling and ABS Cement. I am going to cement it all together and add some Vulkem around the entire fixture to prevent any leaks. I will post pics in the afternoon tomorrow of the final product.

I am nervous about heating that up and pulling out the current ABS pice that is in there because I heard it is nearly impossible to get an adhesive/cement for the Polyethylene tank.

Any advice on that?
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Old 05-31-2013, 06:47 AM   #5
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I would get a large hose clamp and put it around the tank neck, heat the neck with a heat gun and tighten the clamp. The Polyethylene tank becomes very pliable when heated and will conform to the pipe when the clamp is tightened. The Vulkem is a good idea also.
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Old 05-31-2013, 04:56 PM   #6
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Update #2

So here is the final solution. I went to the Big Box store and picked up a ABS straight coupler so that I could attach the Thetford adapter to the existing ABS pipe from the Tank.

First I used ABS cement to attach the coupler to the existing pipe. The I used Rectorseal Epoxy Putty to fill any gap left between the ABS pipe and the Poluethylene tank. Once it cured, I added a thick coating of the TremPro 635 (instead of Vulkem)...

Instead of attaching the adapter into the coupler now, I decided to do it a bit differently. The reason this broke in the first place was that couldn't remove the 4 screws that hold the adapter to the dump valve. There was no arm room from above.

So... my plan is to screw the adapter to the Dump valve first. then when I am ready to install the black tank, I will coat both the ABS adapter and the coupler with ABS Cement and just push it into place and let it sit until it cures... No need to take of the belly... (this time)
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