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Old 06-04-2008, 12:40 AM
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AN Fitting Leak

I have a Speed Demon carb on the Nova that is plumbed with a stainless line and AN fittings. The problem is that one of the "T" fittings leaks no matter how much I tighten it. I looked at the fitting on the inside of the stainless line, and there appears to be some galling on the brass face that engages the male AN fitting. Can that be the issue, and if so, what can be done to correct it? I've never used the AN fittings before, so I'm totally in the dark about all of this. Thanks in advance.

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Old 06-04-2008, 05:48 AM
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First, never over tighten AN fittings, the do not need to be "cranked down". Galling can/will cause leaks. I would replace the specific parts that have galling, or possibly try to sand it out with fine sand paper, again, if the galling is not too deep.

If it were me, forget repairing it, replace what is needed.

Jason
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Old 06-04-2008, 07:53 AM
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There are seal-type gaskets available for 37 degree AN fittings. I believe a company called Seco makes them for the aerospace industry. These are used primarily in new installations as a preventive measure. A badly galled fitting needs to be replaced, however I have heard of these used to correct minor issues. Might work for a low-pressure application such as a carb.
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Old 06-04-2008, 08:46 AM
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Ditto on the replacement.

AN fittings are mostly aluminum and they gall VERY easily.

I personally like JIC fittings -- same as AN - only easier to get and made out of heavier metal (Dont know what they are made out of right off hand)

Not as shiny as the pretty AN fittings but they do the job and most of the hose that they use is rated at 600 psi for cloth covered and 2000 for the true hydraulic.
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