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Old 09-08-2004, 02:48 PM   #1
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Plastic water tank repair/replacement

Hello All

I have finally made it to the point where I could re-install the water tank in my 1964 Globetrotter. Unfortunately when I filled it up to test for water tightness I found that it had a crack in one of the upper corners of the tank that leaked. upon closer inspection there are more cracks in the top of the tank that aren't to the point that they leak but I am a little concerned for their longevity. Is there a way to repair these myself or will I need to replace the whole tank? I have a friend who has a plastic welder, will this be an option? Where could I find a replacement tank? Any help is much appriciated.
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Old 09-08-2004, 08:02 PM   #2
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I welded my Black Water tank, and have had no leaks. Plus, I didn't have a plastic welding kit, had to get it done with a soldering iron and an old milk jug

At this point, you have little to lose, try to fix the old one, if it doesn't work, you are no worse off than you are now. If it does, you won't have to haunt the RV junk yards for a tank.
Terry
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Old 09-08-2004, 08:35 PM   #3
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Originally Posted by argosy20
I welded my Black Water tank, and have had no leaks. Plus, I didn't have a plastic welding kit, had to get it done with a soldering iron and an old milk jug

At this point, you have little to lose, try to fix the old one, if it doesn't work, you are no worse off than you are now. If it does, you won't have to haunt the RV junk yards for a tank.
Terry
Great idea for a blackwater tank, but if you repair a frershwater tank this way, make sure you completely fill all the cracks first. Any unfilled crevices will harbor nasties.
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Old 09-09-2004, 11:32 PM   #4
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Great idea for a blackwater tank, but if you repair a frershwater tank this way, make sure you completely fill all the cracks first. Any unfilled crevices will harbor nasties.
Good point, any ideas on how to fill the cracks on the inside, so they don't get a bunch of water-born stuff?
Terry
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Old 09-10-2004, 09:13 AM   #5
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I would grind them open and then fill completely with rod. If all the cracks are in one area, cut that section out and replace with a welded in panel. You could also weld on a flange with a screw down panel for a hand access port.

I would worry more about cracks in the top of the tank where you can get aerobic bacteria growth.

Depending on the number and length of the cracks you might decide to buy a new tank.
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Old 09-10-2004, 10:34 AM   #6
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Plastic water tank repair/replacement

Greetings Pinebenny!

Quote:
Originally Posted by pinebenny
Hello All

I have finally made it to the point where I could re-install the water tank in my 1964 Globetrotter. Unfortunately when I filled it up to test for water tightness I found that it had a crack in one of the upper corners of the tank that leaked. upon closer inspection there are more cracks in the top of the tank that aren't to the point that they leak but I am a little concerned for their longevity. Is there a way to repair these myself or will I need to replace the whole tank? I have a friend who has a plastic welder, will this be an option? Where could I find a replacement tank? Any help is much appriciated.
If your tank is similar to the one that Airstream installed in my '64 Overlander (large rectangular unit with 30 gallon capacity) you may find it less costly in the long-run to replace the tank. Mine had developed a single large crack along its top surface which upon closer inspection had a number of smaller fractures radiating out from the main crack along most of the length of the larger crack - - the only time that my tank actually leaked was when it was more than 1/2 full and the coach was being towed (always found a wet floor that was traced to water being forced through the cracks while it was "sloshed about" during towing). A new replacement tank from the standard stock of the tank supplier was surprisingly economical - - installed cost at my Airstream dealer (Ace Fogdall RV, Cedar Falls, Iowa) was less than $200. It seems that my original tank was fracturing near and along the original "mold-lines" of the tank.

Good luck with your tank dilemma.

Kevin
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