What is this?

I am currently trying to save a Carter 3826 carb.
After several cycles of bathing in water, rust solvent and Marine Clean the carb shows this white stuff.


I can rub it off but after rinsing, it keeps on coming back.
Anybody any idea what I need to do?

Secoondly what are you using after a carburatur is clean? Do you leave it like it is? Or apply color? Or what else would you recommend?

Thanks

Patrick

 

It's aluminum rust. Basically a corrosion common to aluminum caused by anything from exposure to the elements all the way to electrolysis. It usually shows up us a white powder that you can wipe off and watch come back again.

 

Can it be stopped? I have the same looking white stuff on my fuel pump. Thanks, and P.S., not trying to hi jack this thread.

 

No hijacking there. That would have been exactly my follow-up question.
How can I completely remove it without harming the aluminum? And how can I prevent it from coming back?
Thanks

 

Yes, that is aluminum oxide, I think I saw kits for carbs that have alodyne in them. That's the stuff that makes Quadrajets that brownish color. But it you keep the time short, it is almost clear. We use it on aluminum ground support equipment to keep it from corroding. A heavier application might be required to get past the oxide. And those patches will be a different color. Maybe there's a better chemist than me here who can chime in with an electrolytic solution that will remove the oxide first.

Anyone know what Carter did in the first place? I have an Edelbrock that is shiny, but I don't think what the original Carter's were very shiny.

 

ttt

 

Best bet is to find what causes it and remove the problem. If it's environment you can put on a couple coats of clear after you buff it back to smooth. If it's electrical than you can track down the bad ground and clean it up. I'm going through it now because my electric choke wasn't grounded well and it caused some powdering as well as the carb mounting bolts to rust up.