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Allis Chalmers Discussion Forum

1936 AC WC gas tank rust

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01-07-2008 16:16:35

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I have a 1936 AC WC with rust scale in the gas tank. The fill spout sticks in to the tank by a couple inches. Is the fill neck soldered in where I can remove the neck? I had planned to put something in to break the rust loose but the neck keeps the rust from coming out and I don't know that it will all fall out the fuel line hole.

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David Maddux

01-07-2008 18:38:55

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 Re: 1936 AC WC gas tank rust in reply to drive_AC, 01-07-2008 16:16:35  
Drive: Here is how you do a professional job; First powerwash the inside of tank to remove all the large particles.Plug the bottom with pipe plug, pour 1 quart of muriatic acid in tank, be sure to wear rubber gloves and eye protectors. Roll tank around to coat all surfaces slowly for 15 minutes or longer. Empty acid in a safe place. Then rinse the tank out with fresh water. Then you need to get a solvent called MEK {Methyl Ethyl Ketone}. This can be bought at Sherwin Williams paint stores or hardware stores. Pour one pint in tank with plug in and roll around. Dump MEK out and do it again with a fresh pint of MEK. The MEK absorbs the water before it has time to form rust back into the tank. Then go to O'Reilleys Auto Parts store and get 1 quart of [Red kote] gas tank liner, put in tank with plug screwed back in and roll around. You can pour the excess liner back in the can to reuse later. You will have a gas tank liner that will last a lifetime, no more rust ever again. Also I forgot to mention that when I do each step, instead of using the gas cap, I tape the opening with duct tape. If you have any questions feel free to contact me. alliscdave@yahoo.com. I have done many with great success and will never have rust again in these tanks. This tank liner is also compatible with the gas contaning alcohol .

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01-07-2008 17:59:22

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 Re: 1936 AC WC gas tank rust in reply to drive_AC, 01-07-2008 16:16:35  
That's what I did with our 1958 JD 720 gas,it's been 3 year's and it been fine after they boiled it out and coated it with some black colored stuff,it had NO hole's but the rust and scale kept plugging the setiment bowl screen,My issue came from not being used enough,10-12 hr's a year,and sitting around,we sold our farm in Illinois and bought a campground in florida and the humidity in the summer got to it.

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01-07-2008 17:39:52

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 Re: 1936 AC WC gas tank rust in reply to drive_AC, 01-07-2008 16:16:35  
I have learned that the best solution is to take the tank to a radiator shop, have them boil it out and pressure test it. If it has any leaks, they can fix them.

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01-07-2008 17:52:02

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 Re: 1936 AC WC gas tank rust in reply to patsublett, 01-07-2008 17:39:52  
I was looking at possibly using a gas tank sealer by POR 15 to seal the tank after I get all the rust out.

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Dick H in NY

01-07-2008 16:36:36

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 Re: 1936 AC WC gas tank rust in reply to drive_AC, 01-07-2008 16:16:35  
Do you have or have access to a wet-dry vacuum. You might be able to suck all the particals out of the tank without unsoldering it.HTH Dick

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Ken L.

01-07-2008 19:15:58

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 Re: 1936 AC WC gas tank rust in reply to Dick H in NY, 01-07-2008 16:36:36  
With a shop-vac, you are pulling fumes out of the tank, through the shop-vac which makes sparks. Sparks and fumes like each other a lot.

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01-07-2008 16:44:51

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 Re: 1936 AC WC gas tank rust in reply to Dick H in NY, 01-07-2008 16:36:36  
I hadn't thought of that but it is worth a try. I will give it a try. Thanks

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Jack a

01-10-2008 03:53:55

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 Re: 1936 AC WC gas tank rust in reply to drive_AC, 01-07-2008 16:44:51  
Heard of a guy not too long ago get killed doing just that.

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