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09-02-2012, 12:00 PM
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#1
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Montana Fan
Join Date: Nov 2002
Location: Livingston
Posts: 177
M.O.C. #53
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Crack in holding tank
Has anyone had any success with fixing a crack in a holding tank? Our gray tank has a small crack about half way up next to the discharge from the tank. No idea why it cracked as it is not in a location which would be stressed. I have a can of "Flex Seal" but have hesitated using it. Also, are the inlet connections to the tank glued. I would get a small amount of leakage if I would allow the water back up in the shower. All suggestions will be greatly appreciated.
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09-02-2012, 01:04 PM
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#2
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Yepper! The 'why' of the crack, is the rigid discharge pipe, you must install two rubber repair couplings in it so it can flex between the position of the empty tank and the full tank.
I will find my repair slideshow. There is a very good repair kit I found that works super. You have to follow the easy directions when you apply it. Black tank repair kit: Amazon
Kit:
http://www.amazon.com/Plasti-Mend-Plastic-Repair-Holding-Tank/dp/B003JC3UB2
Slide-show:
https://picasaweb.google.com/Jimsue13/20120113HoldingTankRepairs?authuser=0&feat=directl ink
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09-02-2012, 01:04 PM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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If you use the search function you'll find this thread: http://www.montanaowners.com/forums/...ms=tank,repair There are several answers for you there.
Ozz beat me. He's got a great answer or use some of the ideas on the thread.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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09-02-2012, 03:01 PM
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#4
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Montana Master
Join Date: Oct 2007
Location: Land O Lakes
Posts: 2,751
M.O.C. #7753
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After having all my tanks replaced over the last 5 yrs I understand why they kept cracking. All the discharge and fill fittings are plastic welded in place. As Oz said they need the repair flex couplings to absorb the flexing of the tanks and the vibrations of road time. I am on my 3rd black tank, the first was from a stupid, the second one was because the tank vibrated and broke the plastic weld around black tank fill pipe from the toilet. when they replaced the first tank they had to use a flex coupling on the pipe between the tank and dump valve but the still welded the top pipe to the tank and that is where it broke last time. The rubber repair flex couplings are not pretty but they and way better than the solid installations.
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09-03-2012, 06:19 AM
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#5
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Seasoned Camper
Join Date: Dec 2009
Location: Sandy Beach
Posts: 97
M.O.C. #9975
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I just had all three of my tanks replaced. My extended warranty covered the cost. The gray and black tanks were not installed properly and would slide about 2 to 3 inches to the front and back as we traveled with some liquid in them. This caused stress on the outlet fitting. I repaired the cracks with the tank repair kits but they are only temporary. Check to see if your tanks slide and get that problem fixed.
Gary
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09-04-2012, 02:23 AM
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#6
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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I have successfully repaired holding tank cracks by applying a fiberglass patch followed by the eternabond tank tape, over the fiberglass, the kind with the metalic wrap on one side
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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09-05-2012, 02:11 PM
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#7
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Montana Master
Join Date: Sep 2010
Location: North East
Posts: 1,050
M.O.C. #10758
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I blew out the seam in my black tank. I used the repair kit that OZZ recommended and it worked just fine.
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09-06-2012, 02:43 PM
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#8
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Montana Fan
Join Date: Dec 2011
Location: Livingston
Posts: 350
M.O.C. #12009
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Quote:
quote:Originally posted by Ozz
Yepper! The 'why' of the crack, is the rigid discharge pipe, you must install two rubber repair couplings in it so it can flex between the position of the empty tank and the full tank.
I will find my repair slideshow. There is a very good repair kit I found that works super. You have to follow the easy directions when you apply it. Black tank repair kit: Amazon
Kit:
http://www.amazon.com/Plasti-Mend-Plastic-Repair-Holding-Tank/dp/B003JC3UB2
Slide-show:
https://picasaweb.google.com/Jimsue13/20120113HoldingTankRepairs?authuser=0&feat=directl ink
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do you have a pic of the two rubber repair couplings mod
__________________
2014 3850FL
2008 F350 SRW
David and Liz
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09-06-2012, 02:57 PM
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#9
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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No, I didn;t take pictures, just put one close to the tank, under the black bottom cover, and downstream a couple of feet.
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09-06-2012, 03:27 PM
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#10
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Montana Fan
Join Date: Dec 2011
Location: Livingston
Posts: 350
M.O.C. #12009
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Quote:
quote:Originally posted by Ozz
No, I didn;t take pictures, just put one close to the tank, under the black bottom cover, and downstream a couple of feet.
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Thanks,
__________________
2014 3850FL
2008 F350 SRW
David and Liz
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