The Ford Barn

Klattu1929 · 03-02-2025, 03:10 PM

Getting ready to strip my zenith and ultrasonic clean it. Is there a coating to use on the inside to prevent future rust problems. Seems to be a lot of rust removal and converters, but not sure about using inside of a carb. Also be compatible with all the brass jets and fuel.

Brentwood Bob · 03-02-2025, 03:21 PM

I flush with carb cleaner, maybe follow with wd40.
I now include a static test for cracks in the castings.

nkaminar · 03-02-2025, 03:39 PM

Aircraft Spruce have coating for the insides of gas tanks that may work inside a carburetor.

Joe K · 03-02-2025, 05:07 PM

Glyptol would be my choice.

Red, somewhat heavy coating impervious to oil, water, gasoline. Applied as a spray (thinner and more precise coating) or with a brush (heavier.)

You'll want to mask well those areas you don't want to gamble to "plug."

Used a lot on cast machine cases to prevent ingrained foundry sand from coming loose and getting into the moving parts.

A bit expensive. About $55 for either 12oz spray can or 32oz brush on.

Quality though...

Joe K

Klattu1929 · 03-02-2025, 05:41 PM

Got the carb halves cooking in the sonic cleaner, going to check out some Butyrate Dope, just want to coat the bowl area where moisture seems to collect the most. Looks like the best bang for the buck. They are pretty proud of these fuel proof coatings $$$. Thanx for the quick response.

Gary WA · 03-02-2025, 09:21 PM

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Quote:

Originally Posted by Klattu1929

Got the carb halves cooking in the sonic cleaner, going to check out some Butyrate Dope, just want to coat the bowl area where moisture seems to collect the most. Looks like the best bang for the buck. They are pretty proud of these fuel proof coatings $$$. Thanx for the quick response.

Why put anything in there? I have many on the shelve after bead blasting no rust problem. If on a Model A shouldn't have a problem with rust.

47topless · 03-02-2025, 10:30 PM

Quote:

Originally Posted by Gary WA

Why put anything in there? I have many on the shelve after bead blasting no rust problem. If on a Model A shouldn't have a problem with rust.

Good advice. Are you sure, the rust in the carb, is not the result of a rusty fuel tank?

Gold Digger · 03-02-2025, 11:03 PM

Years ago I machined gun parts for Wilson Combat and at the time they done platting on new and old parts and older guns called metalaloy. Not for sure about the spelling. It was a stainless finish that would not come off and you could plate a gun and all of the parts including the screws and it didn't affect the reassembly at all. It was real pliable if the gun part got distorted it stayed on. Metalloy finish was harder and better on a gun than a solid stainless steel gun that was softer steel. If a zenith carb was Metalloy finished it would never wear out or rust any place on it or in it. I don't know where this could be done at anymore but I'm sure someone does it .

nkaminar · 03-03-2025, 06:33 AM

I think the original Metalloy company is out of business. There are other companies that do other types of plating on gun parts. One type of plating may work for a carburetor. A gold plated carburetor would be interesting.

johnbuckley · 03-03-2025, 06:58 AM

Quote:

Originally Posted by Gary WA

Why put anything in there? I have many on the shelve after bead blasting no rust problem. If on a Model A shouldn't have a problem with rust.

X3. If using them no problems arise , if storing them I give them a quick blast of WD40.

Klattu1929 · 03-03-2025, 03:39 PM

Been getting small amount of rust in the bowl. Thought maybe I could eliminate a problem with a simple coating. Maybe WD-40 would be the ticket, drain the bowl and give it a squirt or two in the winter. Also add a bit of fuel dryer in the fall.
Got a pencil filter in the tank and haven't seen any rust particles in the filter bowl on the firewall.

Brentwood Bob · 03-03-2025, 04:23 PM

Rust could be coming from gas tank, although gas is filtered.try a magnet in the sediment bowl if it is glass.

wrndln · 03-03-2025, 05:45 PM

I agree with some here - don't coat it with anything. How many decades were they run with NO coating without problems.

Big hammer · 03-09-2025, 06:32 AM

I just had my Zenith carburetor apart, it’s been 5 years since I’ve had it off, the bowl metal is still shiny, it had some ( very little amount 1/4 of a thumble ) reddish brown rust dust floating on the bottom. Most of the time I put 4oz of MMO in a full tank of ethanol free gasoline unless I’am away from home needing fuel.

RENNERS CORNER · 03-13-2025, 02:33 PM

I agree with others don't put anything in there. You're just asking for trouble if it comes loose. The light amount of surface rust that could come from the bowl is going to be very fine and unless something disturbs it it's just going to grow and be stuck there. It's not going to continuously shed particles that will be plugging jets. Other than the lousy ethanol, which is hydroscopic, there are rust inhibitors in most fuels, gasoline is an oil derivative, so it is an anticorrosion in itself. If you're putting something on the shelf for long-term, you can wipe with your finger some 3in1 oil around the bottom of the bowl if you're concerned. ��

03-02-2025, 03:10 PM	#1
Klattu1929 Member Join Date: May 2023 Location: Washington State Posts: 45	carb rust Getting ready to strip my zenith and ultrasonic clean it. Is there a coating to use on the inside to prevent future rust problems. Seems to be a lot of rust removal and converters, but not sure about using inside of a carb. Also be compatible with all the brass jets and fuel.

03-02-2025, 03:21 PM	#2
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,420	Re: carb rust I flush with carb cleaner, maybe follow with wd40. I now include a static test for cracks in the castings. Last edited by Brentwood Bob; 03-02-2025 at 03:26 PM.

03-02-2025, 03:39 PM	#3
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,855	Re: carb rust Aircraft Spruce have coating for the insides of gas tanks that may work inside a carburetor. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

03-02-2025, 05:07 PM	#4
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,610	Re: carb rust Glyptol would be my choice. Red, somewhat heavy coating impervious to oil, water, gasoline. Applied as a spray (thinner and more precise coating) or with a brush (heavier.) You'll want to mask well those areas you don't want to gamble to "plug." Used a lot on cast machine cases to prevent ingrained foundry sand from coming loose and getting into the moving parts. A bit expensive. About $55 for either 12oz spray can or 32oz brush on. Quality though... Joe K __________________ Shudda kept the horse.

03-02-2025, 05:41 PM	#5
Klattu1929 Member Join Date: May 2023 Location: Washington State Posts: 45	Re: carb rust Got the carb halves cooking in the sonic cleaner, going to check out some Butyrate Dope, just want to coat the bowl area where moisture seems to collect the most. Looks like the best bang for the buck. They are pretty proud of these fuel proof coatings $$$. Thanx for the quick response.

03-02-2025, 11:03 PM	#8
Gold Digger Senior Member Join Date: Nov 2011 Location: Arkansas & Alaska Posts: 685	Re: carb rust Years ago I machined gun parts for Wilson Combat and at the time they done platting on new and old parts and older guns called metalaloy. Not for sure about the spelling. It was a stainless finish that would not come off and you could plate a gun and all of the parts including the screws and it didn't affect the reassembly at all. It was real pliable if the gun part got distorted it stayed on. Metalloy finish was harder and better on a gun than a solid stainless steel gun that was softer steel. If a zenith carb was Metalloy finished it would never wear out or rust any place on it or in it. I don't know where this could be done at anymore but I'm sure someone does it .

03-03-2025, 06:33 AM	#9
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,855	Re: carb rust I think the original Metalloy company is out of business. There are other companies that do other types of plating on gun parts. One type of plating may work for a carburetor. A gold plated carburetor would be interesting. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

03-03-2025, 03:39 PM	#11
Klattu1929 Member Join Date: May 2023 Location: Washington State Posts: 45	Re: carb rust Been getting small amount of rust in the bowl. Thought maybe I could eliminate a problem with a simple coating. Maybe WD-40 would be the ticket, drain the bowl and give it a squirt or two in the winter. Also add a bit of fuel dryer in the fall. Got a pencil filter in the tank and haven't seen any rust particles in the filter bowl on the firewall.

03-03-2025, 04:23 PM	#12
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,420	Re: carb rust Rust could be coming from gas tank, although gas is filtered.try a magnet in the sediment bowl if it is glass.

03-03-2025, 05:45 PM	#13
wrndln Senior Member Join Date: May 2010 Location: Lakeville, MN Posts: 5,297	Re: carb rust I agree with some here - don't coat it with anything. How many decades were they run with NO coating without problems.

03-09-2025, 06:32 AM	#14
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,430	Re: carb rust I just had my Zenith carburetor apart, it’s been 5 years since I’ve had it off, the bowl metal is still shiny, it had some ( very little amount 1/4 of a thumble ) reddish brown rust dust floating on the bottom. Most of the time I put 4oz of MMO in a full tank of ethanol free gasoline unless I’am away from home needing fuel. __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done

03-13-2025, 02:33 PM	#15
RENNERS CORNER Member Join Date: Feb 2013 Location: MICHIGAN Posts: 47	Re: carb rust I agree with others don't put anything in there. You're just asking for trouble if it comes loose. The light amount of surface rust that could come from the bowl is going to be very fine and unless something disturbs it it's just going to grow and be stuck there. It's not going to continuously shed particles that will be plugging jets. Other than the lousy ethanol, which is hydroscopic, there are rust inhibitors in most fuels, gasoline is an oil derivative, so it is an anticorrosion in itself. If you're putting something on the shelf for long-term, you can wipe with your finger some 3in1 oil around the bottom of the bowl if you're concerned. ��