| [GMCnet] Holding Tank Repair [message #78660] |
Tue, 30 March 2010 23:15  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
Here's some photos of repairs I made to the holding tank in Double Trouble
when I was at the COOP.
Donor tank:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=33005
Repaired tank:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=28383
http://www.gmcmhphotos.com/photos/showphoto.php?photo=28384
Here's what / how I did it:
1) Remove all old sealant from crack and holding tank.
2) Using Rotozip increase width of crack to 1/8 inch.
3) Cut doublers from donor tank using Rotozip.
4) Rough up area that the doubler will cover with 40 grit paper.
5) Clean roughed up area with acetone, lacquer thinner, or methyl ethyl
keytone.
6) Fill crack in holding tank with 3M-5200.
7) Spread face of doubler that will contact holding tank with a layer of
3M-5200 3/8 inches thick.
8) Press doubler up against holding tank and attach brace to hold the
doubler to the bottom of the holding tank.
9) Make a wedge and force it in between the bolt that holds the brace to the
frame and the doubler to hold the doubler on the back of the holding tank.
10) Wipe excess 3M-5200 from around doubler.
11) Wait 24 hours for 3M-5200 to cure.
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Holding Tank Repair [message #159006 is a reply to message #78660] |
Thu, 02 February 2012 18:35  |
James Moore
Messages: 71
Registered: January 2004
Karma: 0
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Member |
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Ken,
The attachment bolts pulled out of my tank.
As suggested br Jim Bounds, I drilled 1/4 inch holes through the flange and
inserted 1/4" SS carriage bolts with sillycone on the heads from the inside
of the tank.
I replaced the "O" rings between the Thetford valve and flanges and coated
them with sillycone. This stopped all the flange leaks. I cut the sewer
pipe off 2" or 3" past the Thetford valve and installed a new Valtera valve
with handle extension and flanges. I left the Thetford valve open and used
the Valtera valve to drain the tank.
Worked fine for years and saved me the cost of a new tank and a new piece
of junk Thetford valve.
As Arch would say "JWID" and worked for me.
Jim Moore
75 PB in Pinehurst, GA with no Thetford junk in sewer system
Battle Ground, WA
> [Original Message]
> From: Matt Colie <matt7323tze@gmail.com>
> To: <gmclist@temp.gmcnet.org>
> Date: 2/2/2012 4:12:21 PM
> Subject: Re: [GMCnet] Holding Tank Repair
>
>
>
> Ken,
>
> As to leaks at the black tank dump flange.
> Mine had that and it was two problems.
>
> First was that the valve was set up wrong so it didn't seal correctly and
the stem got corroded.
> Second was that the upper two fasteners had corroded and lost tension.
When I tried to remove them, they took out some of the plastic flange.
Fortunately, there was enough left to take a Heli-coil. (It was a little
tricky getting the drive tang broken off and out of the hole, but I did it
under the coach with no ramps...
>
> I got a new valve, but it was the newer version and not exactly the same,
so I had to budge the plumbing a little.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you
will find
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Holding Tank Repair [message #159039 is a reply to message #159031] |
Thu, 02 February 2012 21:01 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Thanks, Karen, I'd already found your great photo. Problem is, we don't
have a source of the ABS stock locally, nor time to order it. But if no
other idea works out, I may wind up making the flange from Lexan, which I
have, and try to find the right cement to attach the ABS pipe.
Ken H.
On Thu, Feb 2, 2012 at 9:14 PM, KB wrote:
> you've probably already settled on your solution, but here's what I did
> to make a valtera adapter. Cheap parts, readily available almost anywhere:
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=39325
>
>
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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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