Home » Public Forums » GMCnet » Leaky water tank repair (Advise on repairing fresh water tank)
| Leaky water tank repair [message #344068] |
Sun, 09 June 2019 08:30  |
Ken Shaffer
Messages: 89
Registered: September 2017
Location: Marion Iowa
Karma: -1
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My fresh water tank has a crack where the nipple at the bottom connects to tank. Has anyone here tried cutting off that nipple flush with the tank and tapping threads to insert a brass barbed fitting? Just not sure if the tank is thick enough down there to get good enough threads to seal.
Ken Shaffer
Marion Iowa
73 Canyon Lands, 455, Micro-level, Alum radiator, Alcoa wheels, Lenzi hubs/bearings, Howell EFI/EBL, Rostra Cruise, Custom interior
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| Re: [GMCnet] Leaky water tank repair [message #344070 is a reply to message #344068] |
Sun, 09 June 2019 08:47  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Nope. Think what you're proposing to do: Replace a carefully engineered
assembly, which has finally failed, with a kludge using parts not designed
for the purpose. And No, there's probably not enough thickness to allow it
to work even temporarily.
A skilled plastics welder may be able to repair it, or there may be some
suitable adhesive, of which I'm not aware, but most likely replacement is
required.
Sorry,
Ken H.
On Sun, Jun 9, 2019 at 9:42 AM Ken Shaffer via Gmclist <
gmclist@list.gmcnet.org> wrote:
> My fresh water tank has a crack where the nipple at the bottom connects to
> tank. Has anyone here tried cutting off that nipple flush with the tank
> and tapping threads to insert a brass barbed fitting? Just not sure if the
> tank is thick enough down there to get good enough threads to seal.
>
> --
> Ken Shaffer
> Marion Iowa
> 73 Canyon Lands, 455, Manny Tranny, Custom interior
>
>
> _______________________________________________
> GMCnet mailing list
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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] Leaky water tank repair [message #344071 is a reply to message #344068] |
Sun, 09 June 2019 08:56 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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I had the same (similar) problem with my fresh water tank. Some person had
over tightened the outlet fitting and stripped the female threads in the
tank. I removed the tank from the coach, and took it to Bomar plastics near
Portland, Or. They took a hot knife and cut the old bung out and plastic
welded a new one in place. Took them about 15 minutes. Cautioned me against
over tightening the nipple, and sent me on my way. That was years ago, and
no further issues with that part.
Jim Hupy
Salem, Or
On Sun, Jun 9, 2019, 6:42 AM Ken Shaffer via Gmclist <
gmclist@list.gmcnet.org> wrote:
> My fresh water tank has a crack where the nipple at the bottom connects to
> tank. Has anyone here tried cutting off that nipple flush with the tank
> and tapping threads to insert a brass barbed fitting? Just not sure if the
> tank is thick enough down there to get good enough threads to seal.
>
> --
> Ken Shaffer
> Marion Iowa
> 73 Canyon Lands, 455, Manny Tranny, Custom interior
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Leaky water tank repair [message #344076 is a reply to message #344068] |
Sun, 09 June 2019 10:49 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Ken- in would not cut it off. You are best
To use west systems epoxy to rebuild that.
If there is a skilled
Plastic welder around they can do some fantastic work. Diy plastic welding could work. Buy i made a bigger hole in the last fresh water tank myself then I started with and had to get a new tank. I have had great luck on pods and a few other plastics, but could not get any filler plastics I tried to bond(harbor freight rids, milk jug and 5 gallon bucket).
There are some people who will have a used tank I have seen, but the senders have always been garbage on those so factor in in a new oem sender system you are better buying a new tank.
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] Leaky water tank repair [message #344078 is a reply to message #344071] |
Sun, 09 June 2019 10:52 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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Ken,
If you want to do it correctly you would need to put a flat washer on the inside of the tank and put a brass nut on after that. Question??? HOW do I get inside the tank?
An addition of a cleanup of your fresh water tank will do two things.
1. Allow you to work on the tank on the inside.
2. Allow you to clean out the tank. You would be surprised how much stuff is on the bottom of the tank, mostly sand.
The Items that you want to purchase is deck plate. They come in a 4” size and a 6” size, I recommend the 6” size. You can get them from West Marine or maybe a local marina.
https://www.westmarine.com/deck-plates
This is what one looks like installed:
http://www.gmcmhphotos.com/photos/interior-rear-construction-detail/p65008-fresh-water-tank-on-passenger-side.html
Great mod for yearly cleanout and sanitizing the tank.
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Jun 9, 2019, at 9:56 AM, James Hupy via Gmclist wrote:
>
> I had the same (similar) problem with my fresh water tank. Some person had
> over tightened the outlet fitting and stripped the female threads in the
> tank. I removed the tank from the coach, and took it to Bomar plastics near
> Portland, Or. They took a hot knife and cut the old bung out and plastic
> welded a new one in place. Took them about 15 minutes. Cautioned me against
> over tightening the nipple, and sent me on my way. That was years ago, and
> no further issues with that part.
> Jim Hupy
> Salem, Or
>
> On Sun, Jun 9, 2019, 6:42 AM Ken Shaffer via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> My fresh water tank has a crack where the nipple at the bottom connects to
>> tank. Has anyone here tried cutting off that nipple flush with the tank
>> and tapping threads to insert a brass barbed fitting? Just not sure if the
>> tank is thick enough down there to get good enough threads to seal.
>>
>> --
>> Ken Shaffer
>> Marion Iowa
>> 73 Canyon Lands, 455, Manny Tranny, Custom interior
>>
>>
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| Re: Leaky water tank repair [message #344084 is a reply to message #344076] |
Sun, 09 June 2019 14:18 |
Ken Shaffer
Messages: 89
Registered: September 2017
Location: Marion Iowa
Karma: -1
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Member |
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I plan on checking to find a plastic welder locally. I do like the idea of creating an inside access that would allow a rubber washer and nut on the inside of the tank. Concerned that with the original nipple located in the corner of the tank that I could get a flat enough surface for washer to seal against. S
Ken Shaffer
Marion Iowa
73 Canyon Lands, 455, Micro-level, Alum radiator, Alcoa wheels, Lenzi hubs/bearings, Howell EFI/EBL, Rostra Cruise, Custom interior
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| Re: [GMCnet] Leaky water tank repair [message #344200 is a reply to message #344084] |
Fri, 14 June 2019 07:57 |
jessfarr
Messages: 100
Registered: August 2004
Karma: 1
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Senior Member |
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Love the clean out port, just wonder why I didn't think of it.
Has anyone tried bondic on these tanks?
www.bondic.com
jesse farr
74, 76 & 78 GMCs
----- Original Message -----
From: Ken Shaffer via Gmclist
Reply-To:
To:
Cc: Ken Shaffer
Sent: 6/9/2019 3:18:37 PM
Subject: Re: [GMCnet] Leaky water tank repair
________________________________________________________________________________
I plan on checking to find a plastic welder locally. I do like the idea of creating an inside access that would allow a rubber washer and nut on the
inside of the tank. Concerned that with the original nipple located in the corner of the tank that I could get a flat enough surface for washer to
seal against. S
--
Ken Shaffer
Marion Iowa
73 Canyon Lands, 455, Manny Tranny, Custom interior
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jesse farr, soddy tn USA '74 Canyonlands 260
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| Re: [GMCnet] Leaky water tank repair [message #344203 is a reply to message #344202] |
Fri, 14 June 2019 15:12 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Gearld is correct in addressing that it is not always about if it works,but
how it will comply.
We have customers that are willing to take us to court for small things
like this and do not like to recommend to people.
I like hearing about new products and appreciate you bringing them up.
On Fri, Jun 14, 2019 at 1:03 PM Gerard Hickey via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I would be weary of using Bondic. It is not an FDA food safe plastic.
> Might be fine, but who knows if it is giving off any interesting molecules.
>
> --
> Gerard Hickey / WTØF IRLP:3067/Echolink:529661
> hickey@kinetic-compute.com DMR: 3102272
> 425-395-4554
>
> On 6/14/19 5:57 AM, Jesse Farr via Gmclist wrote:
>> Love the clean out port, just wonder why I didn't think of it.
>>
>> Has anyone tried bondic on these tanks?
>>
>> www.bondic.com
>>
>> jesse farr
>> 74, 76 & 78 GMCs
>>
>>
>> ----- Original Message -----
>> From: Ken Shaffer via Gmclist
>> Reply-To:
>> To:
>> Cc: Ken Shaffer
>> Sent: 6/9/2019 3:18:37 PM
>> Subject: Re: [GMCnet] Leaky water tank repair
>>
> ________________________________________________________________________________
>>
>> I plan on checking to find a plastic welder locally. I do like the idea
> of creating an inside access that would allow a rubber washer and nut on the
>> inside of the tank. Concerned that with the original nipple located in
> the corner of the tank that I could get a flat enough surface for washer to
>> seal against. S
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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