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Rebuilding Carb, Rust Removal Question

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Tim

08-14-2003 18:50:40

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I am rebuilding my Marvel Schebler carb for my '45 A. I am not able to get all of the brass parts out, as they have fused to the cast iron...

What is the best chemical way to clean the rust? Will lye damage the brass?

Thanks, Tim

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DEJ

08-15-2003 14:47:34

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Re: Rebuilding Carb, Rust Removal Question in reply to Tim , 08-14-2003 18:50:40

I just rebuilt a carb for a 1950 Farmall M and I used muriatic acid, it didn't do any damage but there is an aluminum sleeve in the center that desolves very fast. The best way to cleen all that crap out of there is soak it over night in paint thinner then scrub the inside with a stiff bristol paint brush. If it is very bad use those small brass wire brushes from car parts. That will clean it up nice, take off all grease and paint and leave a nice surface for the repaint.

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MDR

08-15-2003 06:08:02

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Re: Rebuilding Carb, Rust Removal Question in reply to Tim , 08-14-2003 18:50:40

Tim, go to page 8 on this forum and look for a post by Frank with title "How do you get rust out of carb." Look at the post by jal-SD on using electrolysis. I just had to try this method - you won't beleive the results. Thanks jal-SD for sharing this!!

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Slowpoke

08-15-2003 00:44:55

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Re: Rebuilding Carb, Rust Removal Question in reply to Tim , 08-14-2003 18:50:40

I have disassembled several MS carbs, and they will come apart eventualy. Use a good penetrating oil, like PB Blaster, Kroil, or such. Let it soak in around the brass parts, then use a 6 point socket or wrench. Try tightening a little first, then loosen, thighten again, loosen. If it doesn't move add more penetrating oil, and wait.
Try again. 6 point tools only! For the screwdriver slots, be sure the blade is the same width as the screw, and fits snuggly. The brass is soft so it must be treated gently. Go slow. I have found that the T shaped tool used to install new ends on garden hose makes a nice large screwdriver bit for 1/2" wide screw heads.
Use a copper kitchen cleaning pad, old dental tools, small wire brushes, or other scraping tools to remove deposits from the castings.

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Fred

08-14-2003 20:11:05

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Re: Rebuilding Carb, Rust Removal Question in reply to Tim , 08-14-2003 18:50:40

Soak it in Muriatic acid for a short period, maybe 20 minutes. Rinse well. Read and heed all precautions on the bottle. A gallon from Ace hardware costs about 4 bucks. Be careful. Fred.

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Jailkeeper

08-14-2003 20:09:56

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Re: Rebuilding Carb, Rust Removal Question in reply to Tim , 08-14-2003 18:50:40

I'd go with a can of carburetor cleaner and air hose myself. There are stronger "bath" type carb. cleaners available, but they are really harsh and may actually do more damage than good sometimes.

I don't know about using lye, I've never dealt with it so I'd be afraid to try it.

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