Black Tank Spray Ball Seal Leaking

[gunafulltime]

I am helping a friend with a Jay Flight. The seal around the black tank sprayer/rinser, where it seals against the black tank, is leaking. Is there a sealant that will likely stop the leak? His warranty has long since expired. We are hoping we can fix it without removing the tank. I put the pictures in the following post.

[gunafulltime]

Here are the pics. It is leaking from the bottom.

[gunafulltime]

The sprayer is a spinweld fitting. Am I correct that you cannot remove it without dropping the tank? I think that's true because the sprayer end of the fitting would fall into the tank. If that's the case, is there some way we can put a seal around it for a semi-permanent or temporary fix. We need to get him back on the road.

I read a post somewhere for this; they used a urethane windshield caulk. I think I saw another one that used JB Weld or something like it. But I cannot be sure. I read them over a year ago. I am not finding anything when I search the the JOF.

[gunafulltime]

Our plumber recommended 100% silicon. IDK.

[norty1]

Here is a youtube video that may provide some info:

https://www.youtube.com/watch?v=AdzU6Y9262M

[gunafulltime]

Thank you, Norty!
I watched this video yesterday.
The sprayer we are working with is a spinweld. It cannot be removed like this style that screws in. It is a different design. The spinweld is a "melted" seal. It is one piece that gets "welded" into the hole. The Jayco dealer says we have to remove the tank to remove the sprayer. The sprayer nozzle, on the inside, has a flange at its base that presses against the interior wall. So you cannot simply unscrew it and pull it out from the outside.

We are trying to seal it as best as we can without removing the tank. At this point, we need to get him a temporary seal. We can remove the tank at a future date when he does not need to use the camper. We are just trying to decide the best way to get a temporary seal from the outside.

[SmokerBill]

Is there any way you can clean it up and plastic-weld it?

https://www.harborfreight.com/weldin...c-welders.html

[JFlightRisk]

This sealant works great for every kind of leak I've had. I don't go anywhere without it. It will even seal a gas tank. No horse in the race, just like it.

https://eclecticproducts.com/product/seal-all/

[gunafulltime]

Thank you, gentlemen. I'll keep you posted.

[gunafulltime]

We went with the 3M 08693 Auto Glass Urethane Windshield Adhesive. After it cures, we'll test it and update the thread.

The exterior wall flange of the spin-weld fitting had 2 small cracks in it. Using popsicle sticks, I pressed in the first course. Then I used the sticks to smooth on two more courses. We shall see.

[gunafulltime]

Some pics:

[JFlightRisk]

That sure does look like it'll do the job. 3M makes good stuff.

[gunafulltime]

Thank you, @Jflightrisk!
We sure hope so. It sets up pretty fast, a touch faster than Quad (which set quickly). I kept my hands gloved and worked as efficiently as I could. Who knows, that stuff could hold for a long time. I watched a lot of videos and read about it. It's pretty durable and proven in automotive applications (mainly glass, plastic lenses, and convertible windows).

[gunafulltime]

We gave the 3M urethane windshield adhesive caulk a 3 day cure. Today, we reconnected the black tank sprayer hose to the spin-weld fitting and did a 10 minute flush test to verify that the hose and its connectors are solid. Next, we filled the black tank to see if the sealant around the cracked fitting will hold. So far, it is holding. We are leaving it full for the day to make sure it holds. If she stays tight, we'll button up the belly tomorrow and call it good for now.

The 3M caulk cures to a semi-hard but pliable seal. Which is exactly what you want from a windshield sealant. Hopefully, this will help others who discover a spin-weld failure. If it fails in the near-term, we will update this thread. I am not sure what time duration qualifies as a successful temporary repair. Maybe 3-6 months? Who knows, it could last for a very long time. I know that the windshield adhesives can be effective for decades on automobiles.

[JFlightRisk]

Good information on your repair. That's a product I wouldn't have thought of until you mentioned it. I'll file it in my gray matter for the future. Thanks!