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| Re: [GMCnet] Restoration. Are holding tanks repairable? [message #293551 is a reply to message #293550] |
Fri, 08 January 2016 14:19   |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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This question always gets asked often. There are many opinions, both for and against.
I don't like dealing with a leaking or any potential smell, so a solid no questions that it is sealed tank, would be the direction I would go. However with your full gut/restoration, and the fact you are making a rear bathroom coach, I would be thinking of a way to have extra capacity then OEM.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Restoration. Are holding tanks repairable? [message #293556 is a reply to message #293550] |
Fri, 08 January 2016 15:48 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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On Frady's advice I got some glass mat and some black resin from Homer the Despot - forget which one but it was for 'all types of plastic' and patched mine around the outlet inside and out. Cleaned the tank, took the valve off, scrubbed and roughed the surface inside and out and laid this stuff on inside and out. Two years later it hasn't leaked. Knock on wood.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Restoration. Are holding tanks repairable? [message #293561 is a reply to message #293550] |
Fri, 08 January 2016 19:57 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I had my holding tank plastic welded about 10 years ago by a guy with an iron that was not much more that a soldering iron. He fixed my major break and several additional cracks around the sending unit. It took him all of 10 minutes laying under the coach to fix it all. About 5 years later I took him a plastic gas tank mounted under my Blazer that had a piece of steel run into it. It was the same story. 10 minutes with the iron and it was fixed.
I suggest plastic welding. The point to be welded must be clean and dry when they do it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Restoration. Are holding tanks repairable? [message #293565 is a reply to message #293561] |
Fri, 08 January 2016 20:17 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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To add to Ken Burtons post, the plastic also needs to be warm to allow
internal stresses to not be present for a structurally sound thermal
weld. If it is cold out or the part is cold, the area around the repair
area needs to be warmed up prior to welding. Plastic is a poor conductor of
heat so it can feel hot on the surface but be cold in the middle or the
backside. I suggest applying lower heat levels for a longer time period
rather than a lot of heat for a short time. This is mainly for welding of
thermoplastics but I am sure an adhesive weld such is done on thermoset
plastics would respond favorably as well.
Sully
77 royale
Seattle
On Friday, January 8, 2016, Ken Burton wrote:
> I had my holding tank plastic welded about 10 years ago by a guy with an
> iron that was not much more that a soldering iron. He fixed my major break
> and several additional cracks around the sending unit. It took him all of
> 10 minutes laying under the coach to fix it all. About 5 years later I
> took him a plastic gas tank mounted under my Blazer that had a piece of
> steel run into it. It was the same story. 10 minutes with the iron and it
> was fixed.
>
> I suggest plastic welding. The point to be welded must be clean and dry
> when they do it.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Restoration. Are holding tanks repairable? [message #293567 is a reply to message #293565] |
Fri, 08 January 2016 21:06 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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GMC fitted coaches usually have polypropylene tanks according to the owner's manual.
I took the tank from my 73 to a plastic welder -- turned out to be polyethylene.
I assume Coachmen tanks may be of either plastic.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Restoration. Are holding tanks repairable? [message #293575 is a reply to message #293550] |
Fri, 08 January 2016 23:21 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bob,
As I mentioned during our telecon, I consider the potential for future
problems, at always inconvenient times, full justification for buying new
tanks now. That's what I did when rebuilding my coach in '98 and have
never had a problem since. Another reason to do that, which I took
advantage of, is that there's a larger black tank available now than that
delivered on the rear bath Birchaven's and Royale's. I forgot to discuss
it with you earlier, but perhaps with your new shower design you'll need a
different gray water tank and/or some modification to the OEM black tank?
I'm pretty sure JimK sells GMC design, and the two different Coachmen
design tanks, but there's always this outfit with hundreds of stock designs
and probably custom as well: http://www.ardemco.com/holding-tank-systems/
There are probably others I'm not familiar with.
One more thing to consider: You mentioned adding thicker body pads.
Especially with your unique need for loading ramp storage, you may want to
talk to Hal StClair about how he raised the body off of the frame. That
would also provide room for significantly larger gray and black water tanks
(and gas tanks).
Just more ideas to think about! :-) Have fun!
Ken H.
On Fri, Jan 8, 2016 at 2:45 PM, Bob Dunahugh wrote:
> All 4 tanks on both Royales have had a variety of stuff applied to the
> outsides. Anything really work?Bob Dunahugh
> _______________________________________________
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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