| Re: [GMCnet] Pondering a Poo Problem [message #124883] |
Fri, 06 May 2011 18:31  |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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Which reminds me of a similar question I've been meaning to ask...
On both our coaches, there's a vertical tube that runs from where the toilet
mounts, down into the black tank almost to the bottom of the tank. What is it for?
To prevent sloshing?? Seems like what it mostly does is cause "stuff" to hang
up in the tube and not drain out properly. Also makes it really hard to clean
the tank or see how full it really is. Since it's on both our coaches, I have
to assume it's a common feature. Anybody tried modifying it?
thanks,
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] Pondering a Poo Problem [message #124910 is a reply to message #124883] |
Fri, 06 May 2011 20:32  |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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Senior Member |
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I just did a quick online survey of general RV replacement black tanks and fittings,
and it appears that this weird tube really is an oddity only for GMC's.
So here's a theory to present to the experts here: the tube
was a way to keep toilet paper and poo away from the thermasan inlet.
What say ye?? Other theories??
thanks,
Karen
1973 23'
1975 26'
Otherwise, I don't see the point of it.
KB wrote:
> Which reminds me of a similar question I've been meaning to ask...
>
> On both our coaches, there's a vertical tube that runs from where the
> toilet
> mounts, down into the black tank almost to the bottom of the tank. What
> is it for?
> To prevent sloshing?? Seems like what it mostly does is cause "stuff"
> to hang
> up in the tube and not drain out properly. Also makes it really hard to
> clean
> the tank or see how full it really is. Since it's on both our coaches,
> I have
> to assume it's a common feature. Anybody tried modifying it?
>
> thanks,
> Karen
> 1973 23'
> 1975 26'
>
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] Pondering a Poo Problem [message #124915 is a reply to message #124910] |
Fri, 06 May 2011 20:59 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| KB wrote on Fri, 06 May 2011 20:32 |
I just did a quick online survey of general RV replacement black tanks and fittings,
and it appears that this weird tube really is an oddity only for GMC's.
So here's a theory to present to the experts here: the tube
was a way to keep toilet paper and poo away from the thermasan inlet.
What say ye?? Other theories??
thanks,
Karen
1973 23'
1975 26'
Otherwise, I don't see the point of it.
KB wrote:
> Which reminds me of a similar question I've been meaning to ask...
>
> On both our coaches, there's a vertical tube that runs from where the
> toilet
> mounts, down into the black tank almost to the bottom of the tank. What
> is it for?
> To prevent sloshing?? Seems like what it mostly does is cause "stuff"
> to hang
> up in the tube and not drain out properly. Also makes it really hard to
> clean
> the tank or see how full it really is. Since it's on both our coaches,
> I have
> to assume it's a common feature. Anybody tried modifying it?
>
> thanks,
> Karen
> 1973 23'
> 1975 26'
|
Karen,
If you are talking about the pipe from the toilet into the black tank -- on my 73 it screws into the top of the tank and only goes in to the depth of the threaded fitting.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=31395&title=0053&cat=4620
If you have replacements perhaps they are the standard length and no one wanted to bother cutting them off. Our black tank is probably a lot more shallow than most.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Pondering a Poo Problem [message #124918 is a reply to message #124910] |
Fri, 06 May 2011 21:12 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Karen,
Are you referring to the sewer down-pipe itself or another pipe?
If another pipe, I don't have a clue.
If the sewer pipe, I suspect what you're seeing is a black water tank with a
slip fitting for that pipe. The installer, perhaps to be SURE the pipe was
inserted "far enough", left it TOO long. With the flexing of the top of the
plastic tank, an inch or two of pipe into a slip joint is a good idea, but
the pipe should be at least 3-4 inches off of the bottom, IMHO.
Almost as bad, the vent pipe is often inserted too far into the tank. That
allows the liquids in the tank to reach the vent pipe before the tank's
full, preventing fumes from venting through the vent pipe. Guess where the
fumes go then -- as soon as you flush. They may even escape before
flushing, through the tub, shower, and sink traps.
I find a permanently mounted black water tank flusher to be very handy --
eliminates running a hose inside to a flushing wand on those rare occasions
when I fail to flush after travelling and wind up with coagulated waste.
Ken H.
On Fri, May 6, 2011 at 9:32 PM, KB <kab7@sonic.net> wrote:
> I just did a quick online survey of general RV replacement black tanks and
> fittings,
> and it appears that this weird tube really is an oddity only for GMC's.
>
> So here's a theory to present to the experts here: the tube
> was a way to keep toilet paper and poo away from the thermasan inlet.
>
> What say ye?? Other theories??
>
>
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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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| Re: [GMCnet] Pondering a Poo Problem [message #124930 is a reply to message #124910] |
Fri, 06 May 2011 22:20 |
jw mills
Messages: 199
Registered: September 2006
Karma: -30
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Senior Member |
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When I changed the black tank on my 260 nothing stuck into the tank.
I replaced the "O" ring vent pipe/sink drain couplers with those nice
rubber couplers.
--
Jim Mills
Greeley, CO
1973 CanyonLands 260 TZE-063V100731(under renovation)
1973 Glacier 230 TZE-033V101993
KD0NPU
On Fri, 2011-05-06 at 18:32 -0700, KB wrote:
> I just did a quick online survey of general RV replacement black tanks and fittings,
> and it appears that this weird tube really is an oddity only for GMC's.
>
> So here's a theory to present to the experts here: the tube
> was a way to keep toilet paper and poo away from the thermasan inlet.
>
> What say ye?? Other theories??
>
> thanks,
> Karen
> 1973 23'
> 1975 26'
>
>
> Otherwise, I don't see the point of it.
>
> KB wrote:
> > Which reminds me of a similar question I've been meaning to ask...
> >
> > On both our coaches, there's a vertical tube that runs from where the
> > toilet
> > mounts, down into the black tank almost to the bottom of the tank. What
> > is it for?
> > To prevent sloshing?? Seems like what it mostly does is cause "stuff"
> > to hang
> > up in the tube and not drain out properly. Also makes it really hard to
> > clean
> > the tank or see how full it really is. Since it's on both our coaches,
> > I have
> > to assume it's a common feature. Anybody tried modifying it?
> >
> > thanks,
> > Karen
> > 1973 23'
> > 1975 26'
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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