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JB Weld

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CH(upstate,NY)
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PostPosted: Mon Oct 29, 2012 4:32 pm    Post subject: JB Weld Reply to specific post Reply with quote

Is it gasoline proof? Tanked my genny carb Friday, blew it out and reassembled it. Genny ran a little rough until I shut the fuel off than ran smooth until it ran out. Took the carb apart and found one of the ears that the pin that holds the float broke. Put a little JB to hold the pin and let it sit in case I needed it tonight.

So it it gas proof? If not, any recommendations?
 
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JB weld
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PostPosted: Mon Oct 29, 2012 4:57 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

I think it could work but leave it for 24 hours to dry.
 
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504
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PostPosted: Mon Oct 29, 2012 5:11 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

You really never know, if you got it clean and let it sit for 24 it may work fine. There is a product made to use in gas too.
 
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Dean
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PostPosted: Mon Oct 29, 2012 5:19 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

Gasoline tolerant epoxies are available. I've used such to repair worn float pin bores in Ford/Holley carburetors.

Dean
 
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JMS./MN
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PostPosted: Mon Oct 29, 2012 5:25 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

I used JB weld and fiberglas stripping to patch a Ford p/u tank over 5 years ago- corroded around the mounting straps. Warmed the JB tubes in hot water- mixed easier. Was a second tank, so let it dry a couple weeks. Still holds now.
 
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redtom
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PostPosted: Mon Oct 29, 2012 5:56 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

won't last. Bought a tractor once, ran good for a while then flooded. Took carb apart, seller had glued the brass float to the arm with JB, gas "melted" the JB.
 
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Ultradog MN
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PostPosted: Mon Oct 29, 2012 6:08 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

If I was the dictator of all the world the first thing I would do is outlaw JB Weld.
Then I would outlaw women voting.
I used JB on a carb bowl once and it did not last more than a week or so and it sluffed off.
I have also cleaned and soldered more than one fuel tank that someone used JB on.
I find little use for the stuff.
 
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t.r.k.
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PostPosted: Mon Oct 29, 2012 6:16 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

3 years ago the tank in my '69 1 ton started leaking. Pretty big deal since its in the back of the cab. So I replaced the tank.

On the bottom of the old tank was an old JB-weld patch. I bought the truck in '93 so it was on there then. . . 18 or 19 years. But I wonder if it was really the ethanol in the gas that loosened it up.

Your post reminds me of the Auto Mechanics shop back in the 80's. I broke a float lug off on a carb. in a volkswagen rabbit. My teacher told me to take it and show it to the instructor in the welding shop.
The old guy-probably 60+ years old- builds up the area with something he called 'sil-fos' or some such, cuts it back to shape with a Dremel Tool and drills a new hole for the float pin.

It worked fine.
 
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G1355
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PostPosted: Mon Oct 29, 2012 6:24 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

I had luck but I let my tank sit empty for a week a year later it still holds
 
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M-MAN
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PostPosted: Mon Oct 29, 2012 8:56 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

The old slow drying jb weld is gas proof when cured properly. Had an old mac chainsaw with a fuel tank busted half into that I put back together with it. Ran that saw several more years & it never let go. Try to use it like glue & it won't work.
 
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Jason S.
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PostPosted: Tue Oct 30, 2012 5:13 am    Post subject: Re: JB Weld Reply to specific post Reply with quote

In general regular JB Weld will hold for a while but it usually turns loose, but go get a pack of JB Marine Epoxy it is much more resistant to fuel.
 
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JRSutton
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PostPosted: Tue Oct 30, 2012 8:23 am    Post subject: Re: JB Weld Reply to specific post Reply with quote

I had a carb float crack off once - tried jbwelding it back in place as it was my only real choice before rain got on the hay that was down.

Lasted a few months, but eventually got all rubbery and fell apart.

Somebody said it has to cure properly to work - and they may be right. I certainly didn't let my bandaid job cure properly - had to get it back up and running quickly.
 
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Jim in LA
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PostPosted: Tue Oct 30, 2012 1:44 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

My Dad patched the gas tank on our 8n with JB weld. He used a piece of pillow case saturated with JB weld that had been thinned with paint thinner and it is still holding. I think we used about four tubes. The patch was about 6x8 inches. We first tried using gas tank epoxy but the patch just fell off after curing. A neighbor told him to use the JB weld and paint thinner and it worked. I used JB weld to seal a cracked brass emulsion tube (i think that's the right term) on my Harley carburetor years ago and it held up until last year when I disassembled the carburetor, I discovered the JB weld had started to soften. One of these days I will get around to patching it again so I can go riding.
 
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Mark6005
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PostPosted: Tue Oct 30, 2012 2:43 pm    Post subject: Re: JB Weld Reply to specific post Reply with quote

Only used it once 18-20 years ago on a couple leaks on my 8n radiator. Still have the 8n and no leaks. Hope I didn"t jinx it
 
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dave2
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PostPosted: Wed Oct 31, 2012 1:27 am    Post subject: Re: JB Weld Reply to specific post Reply with quote


I think so....... Prolly the main problem with the stuff (that gives it the bad name) is the users that needed a "quick fix" and done the preperation "quick" also.....
 
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