| Holding tank crack repair [message #221554] |
Sat, 07 September 2013 20:36  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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My 77 EII has a 1" crack at back on right side near the dump valve neck. I have gotten the previous repair glop off by pulling at it with needle nose. I bought a caulk tube of white leak stopper that drys clear. Or should an RV shop do some plastic welding?
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Holding tank crack repair [message #221629 is a reply to message #221604] |
Sun, 08 September 2013 11:49  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Please remember this also. You are trying to repair a plastic tank that is
nearly 40 years old. That is nearing the extreme end of it's useful life.
You might effect a successful repair in one area, only to have another
crack manifest itself shortly afterwards. I don't know about you, but I
have better things to do with my time than repairing aged out plastic, when
there is new stuff available that is much improved over what was used
originally. But, like Jim Bounds is fond of reminding us, it is still
AMERICA and currently we are free to choose how to spend our money. Like
Emery says, plastic welding is a far better process than any adhesive is.
Pay your money and take your choice.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Sep 8, 2013 7:32 AM, "Emery Stora" <emerystora@me.com> wrote:
> John
> If you rough up the area with coarse sandpaper it will help it to adhere
> better. But, keep in mind that it is a mechanical bond. It does not
> dissolve the surface to form a permanent bond.
>
> Plastic welding would be the preferred method of repair.
>
> Emery Stora
>
> On Sep 7, 2013, at 7:36 PM, "John R. Lebetski" <gransport@aol.com> wrote:
>
> >
> >
> > My 77 EII has a 1" crack at back on right side near the dump valve neck.
> I have gotten the previous repair glop off by pulling at it with needle
> nose. I bought a caulk tube of white leak stopper that drys clear. Or
> should an RV shop do some plastic welding?
> > --
> > John Lebetski
> > Chicago, IL
> > 77 Eleganza II
> > Source America First
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Holding tank crack repair [message #221677 is a reply to message #221629] |
Sun, 08 September 2013 17:03 |
willietrucker
Messages: 83
Registered: April 2010
Location: Central Texas
Karma: 0
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As an emergency repair, I have used "Flex Seal" Liquid Rubber Sealant. It comes in a spray can. It is available at Lowe's, HD and other stores.
It is by no means a permanent fix but it works just fine till I can get back to the barn and do a permanent repair with my plastic welder.
Tom Henderson
Elgin, TX
'76 Birchaven 23'
GMC..."Gimme More Cash"
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| Re: Holding tank crack repair [message #221679 is a reply to message #221554] |
Sun, 08 September 2013 17:11 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
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make sure the tank is not currently dripping if you spray on the flex seal in a can. The drips can build up and create a leak path before it dries completly.
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: Holding tank crack repair [message #221724 is a reply to message #221554] |
Sun, 08 September 2013 22:24 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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If you want to take a ride to Chesterton, IN, there is a plastic welder who will slide un the coach and fix it on the spot while the tank is still installed in the coach. He did mine about 6 or 7 years ago. It took him about 20 minutes and cost me $25.00 at the time. You need to be sure it is perfectly dry before you arrive there.
I also had him do a plastic gas tank the same way about a year ago. While you are under there cleaning it up, remove the sending unit screws and replace them with stainless. The original ones rust and expand cracking the plastic around them.
I do not remember the business name. Look up plastic welding in Chesterton, In. He is about 1 mile from the Chesterton exit (Indiana 49) on I-94.
PM me if you can not find it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Holding tank crack repair [message #221735 is a reply to message #221554] |
Mon, 09 September 2013 00:19 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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| JohnL455 wrote on Sat, 07 September 2013 20:36 |
My 77 EII has a 1" crack at back on right side near the dump valve neck. I have gotten the previous repair glop off by pulling at it with needle nose. I bought a caulk tube of white leak stopper that drys clear. Or should an RV shop do some plastic welding?
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I bought a heat gun, shaved a strip of the tank for filler rod, and welded my tank. The filler rod and area to be welded must be cleaned with rubbing alcohol.
Check for alignment stresses created between tank and dump tube.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: Holding tank crack repair [message #221743 is a reply to message #221554] |
Mon, 09 September 2013 08:07 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Thanks guys, this is the info I needed. I'll see if General in Huntley does it or the drive to Indiana might be a good shake down run for the long trip end of month. I'm done with align/ VR box from Jim K and new Spicer shaft. Only drove on 2 lane--so far so good. No pulling and less frantic feeling. 4 deg caster is where I could get it and not get neg camber.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Holding tank crack repair [message #221784 is a reply to message #221554] |
Mon, 09 September 2013 14:47 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Thanks Emery. I'm attempting a repair. Sanded 60 grit, wiped with alcohol. Doing Loctite plastic bonder epoxy, 2 coats, then Gardner leak stopper clear patch in caulk tube as that's flexible, then going to spray area with Mighty Sealer. If that doesn't work, then sand off and go to Terry the plastic welder in Chesterton In. Camping World would only replace ( and didn't get to the 77 GMC part) and General would apply some patch so trying that myself. Need a new tank but wish we had a Jim K by Chicago. Polypropylene has that Teflon like property
John Lebetski
Woodstock, IL
77 Eleganza II
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