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carburetor question

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34gpa

03-30-2006 06:53:38

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After bead blasting out all the rust and cleaning up all passage ways, what is the best coating to apply to the inside of the bowl and main throat to keep it from rusting again? Thanks

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Glen in TX

03-30-2006 17:20:49

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Re: carburetor question in reply to 34gpa, 03-30-2006 06:53:38

I guess many of you have never seen a new or NOS Marvel Schebler carb or the TSX carb new? They and other cast carbs came with a black oxide finish for years and not painted. There are some black oxide finishes that work better than gun blueing on the market. Precision Brand tool black is one of them and doesn't require heating to use it. It does work better in warm weather and with warm water mixed with the degreaser solution. MSC, Grainger and many other industrial vendors carry it. I've used it for a long time on all kinds of steel and cast parts and it is a little more than ordinary phosphoric acid but that is one ingredient. It has a quart of pink looking alcohol phosphoric acid and water degreasing solution, a quart of tool black blue colored mixture of other acids and nitrate solution, and a rust prevention spray solution of mineral oil base. All you need to apply it is some warm water, gloves, air to dry, and some clean rags. It works very well for rust prevention on parts and shop tools that have been cleaned well to the bare metal. The mineral oil can be cleaned off later when painting is desired also and doesn't leave a residue in castings like silicone products can and the black finish isn't going to flake off either.

Tool Black

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Mike Aylward

03-30-2006 10:01:59

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Re: carburetor question in reply to 34gpa, 03-30-2006 06:53:38

34GPA, odds are the carburetor will not rust if you use the tractor regularly. It is when they are stored is when the rust hits. For a tractor that I know will be stored for some months I usually put a small amount of automatic transmission fluid or some two-cycle oil in the gasoline and run it until I know for sure it gets into the carburetor bowl. This keeps the tank, lines and bowl from rusting and will also keep gum from forming in the passages. I usually add about 6 or 8 ounces to a couple of gallons of gas. When you take the tractor out of storage you can drain this small amount and add new gas and start the tractor right up just like you just put it in the shed yesterday. In very rare cases you might have to put in a new set of plugs if you fail to get the oil mixed well enough with the gasoline. This has worked very well for me. I would not want any coating of any kind in the carburetor because any reduction whatsoever in the passage size will affect the performance of the tractor and could also cause flaking if it were to be dislodged, which would cause another set of performance problems (mostly idle quality). My humble opinion. Mike

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wilamayb

03-30-2006 08:03:38

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Re: carburetor question in reply to 34gpa, 03-30-2006 06:53:38

There are some procucts supplied by PPG which include a cleaner and metal conditioner. They are reccomended by Roberts Carb. I took my carb back apart after two years of use. It was as shiny as it was when I blasted it due to the use of the conditioner, so it does work very well. I am not at home, and dont have access to the chemicals to give you the numbers, but they are available at you local auto paint store upon order. The folks at Roberts are more than helpful and will answer your questions as well as supply your parts. Search for them online and drop them an emial to ask for the PPG numbers. The product was a good buy so I would go for it.

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F-I-T

03-30-2006 09:06:36

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Re: carburetor question in reply to wilamayb, 03-30-2006 08:03:38

You can use a gun blue type oxidizer, or have a true tool makers "Black Oxide" applied but that means having to bake the carb in a furnace.

Here are two PPG products that I have used, but honestly, if you take very, very, very, clean steel (like cleaned in an electrolysis bath) and apply phosphoric acid with a stipple brush so it gets around everything, then wipe it off with a phosphoric acid dampened cloth, you can get the same results.

As you can see the conditioner is H3PO4 based.

Frank

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P Browning

03-30-2006 07:28:53

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Re: carburetor question in reply to 34gpa, 03-30-2006 06:53:38

Unfortunately not much! I usually spray a liberal coat of WD-40 into the carb's barrel and as well into the passageways as best I can -- to keep it from corrosion before its put on the tractor. Once pressed into service, I doubt there is a suitable coating that would stand up to today's gasoline.

OSPHO once came to mind, but I decided better of it because of the possibility it may combine with some rust in a pasageway and become a Super Blocker! I mention this to say DON'T use a Rust Converter such that it may enter small orifices!
(PatB)

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