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Author Topic: 1994 Roadtrek 190 Popular black tank removal repair  (Read 1061 times)

Yukonr

  • Posts: 4
1994 Roadtrek 190 Popular black tank removal repair
« on: June 02, 2019, 10:48:20 PM »
Has anyone had experience with removal of black water tank from a Roadtrek?
I have a leak in the black tank about half full. Luckily, I have discovered this in a van that has not been used in many years and I only put water in to test as I just recently bought it.
So I have started the process to remove the tank.
Removed the toilet and flange
Cut the black tank vent and cut away the sealant where it goes through the floor
Removed the knife valve
Removed the straps
Cut through the spots along the bottom edge where the black and gray tanks were plastic welded together
One would think that should be it, BUT, it appear the tanks are still connected to each other. maybe plastic welded at the top as well? Tanks fit together like a jigsaw puzzle, supposedly where the gray tank vent comes out.
Does anyone know if the gray tank has to come out with the black as a unit?
Iím nervous about the vent pipe from the gray being problematic as it comes through the floor at a 45 degree angle and there isnít room to cut and leave space for a union to put back together.
Any insights appreciated.

jubileee

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Re: 1994 Roadtrek 190 Popular black tank removal repair
« Reply #1 on: June 03, 2019, 12:07:52 PM »
I have 93 Roadtrek 210 popular and the black and gray are fastened together as one unit probably for strength and ease of installation. I suggest repairing the spot welds you cut before removing the tanks.  Baking soda and superglue trick will repair the spot welds to stronger then original. Also, baking soda/superglue can repair leak if you can access it.

Rene T

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Re: 1994 Roadtrek 190 Popular black tank removal repair
« Reply #2 on: June 03, 2019, 01:30:24 PM »
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Yukonr

  • Posts: 4
Re: 1994 Roadtrek 190 Popular black tank removal repair
« Reply #3 on: June 03, 2019, 02:42:32 PM »
Jubileee, I will remove both tanks together and may look for the coupling that Rene T has suggested. I have to cut them apart at some point for sure as the black tank is leaking from in between the two. It's only a drip (quick drip) when the tank is over half full, and it's coming from the area where the gray tank "keys" into the black tank (presumably for the vent) and there is less than 1/4" gap between. These suggestions raise two questions:
1) What is the baking soda and super glue trick? Is there a ratio to blend? These tanks are polyethylene, I think (flexible), not like an ABS/PVC type tank I have seen on any repair or replacement parts sites. same kind of material as the fresh water tanks are usually made from.
2) The coupling Rene T has suggested looks like it is stepped. Is it meant to install over a joint where I could cut the pipe directly beside the existing coupling and clamps onto the coupling with one end and onto the pipe with the other? That's the difficult part is no room to leave a space to glue on another coupling.

Thanks for your input guys
Sincerely appreciated

Rene T

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Re: 1994 Roadtrek 190 Popular black tank removal repair
« Reply #4 on: June 03, 2019, 09:13:59 PM »

2) The coupling Rene T has suggested looks like it is stepped. Is it meant to install over a joint where I could cut the pipe directly beside the existing coupling and clamps onto the coupling with one end and onto the pipe with the other?

The one I showed was stepped. That was the only one I found. I was in a hurry. They do sell them at Home depot that are straight. 1-1/2' to 1-1/2".  3" to 3". etc.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Yukonr

  • Posts: 4
Re: 1994 Roadtrek 190 Popular black tank removal repair
« Reply #5 on: June 27, 2019, 07:48:58 PM »
Found the culprit. Someone went off-road a bit too far. Iíll try to post some pics so the next guy can see what the heck it all looks like. I couldnít find any pictures of tanks to see what was the best way to disassemble.

Yukonr

  • Posts: 4
Re: 1994 Roadtrek 190 Popular black tank removal repair
« Reply #6 on: June 27, 2019, 07:57:22 PM »
So the tanks are polyethylene (pe) or polypropylene(pp) so I donít think the superglue trick would have worked. I read a few places that ďnothingĒ will stick to pp or pe. I bought some pp welding rod on Amazon and used a heat gun and small torch. It didnít weld perfect or easy but itís sealed up now. I did consider if I had trouble I was going to add Black Death (acoustic sealant) because it DOES supposedly stick to pp or pe as thatís what vapor barrier is made from. Just a thought. I hope this helps someone as I had a heck of a time finding resources for info.