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Old 08-10-2019, 08:37 AM   #1
History
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Default Flared copper washers for gaskets?

I posted this video link in another thread because I thought it was a great idea?? No one responded so I don't know if that's good or bad, the thread was almost at it's end.

https://youtu.be/u7WULLs2nV8

What do you pros think of this as a fix for the flared gas lines that go from gas shut off valve to the firewall side of the sediment bowl or any flared fitting for that matter? I've read that the original flare is different than most flaring tools that people have. One of my lines had thread wrapped around the back of the flare to add more pressure (I ASSume). Seems like a great idea to me still??

Is there a way to embed videos here instead of a link?

Last edited by History; 08-10-2019 at 08:57 AM.
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Old 08-10-2019, 09:44 AM   #2
Ray in La Mesa
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Default Re: Flared copper washers for gaskets?

Pretty kool process. Another way that I've used is to clean the flare on the tubing, apply a bit of soldering acid and melt a tiny, thin layer of solder on the flare. The solder is soft and molds to the other fitting and makes a great seal.
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Old 08-10-2019, 10:08 AM   #3
Jim Brierley
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Default Re: Flared copper washers for gaskets?

If making a new line, use copper tubing. If the flare is not identical, the copper will conform. In your case, I doubt it is to apply more pressure, but to act as a gasket???
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Old 08-10-2019, 10:09 AM   #4
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Default Re: Flared copper washers for gaskets?

We use a small ball grinder in a hand drill and clean up the seat, esp the carb.
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Old 08-10-2019, 11:40 AM   #5
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Default Re: Flared copper washers for gaskets?

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Originally Posted by Jim Brierley View Post
If making a new line, use copper tubing. If the flare is not identical, the copper will conform. In your case, I doubt it is to apply more pressure, but to act as a gasket???
One shouldn't be using copper for gas lines.
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Old 08-10-2019, 12:11 PM   #6
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Default Re: Flared copper washers for gaskets?

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One shouldn't be using copper for gas lines.
Ditto. Copper lines work harden and then crack.
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Old 08-11-2019, 04:20 PM   #7
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Default Re: Flared copper washers for gaskets?

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Originally Posted by Jim Brierley View Post
If making a new line, use copper tubing. If the flare is not identical, the copper will conform. In your case, I doubt it is to apply more pressure, but to act as a gasket???
Jim the thread/string was behind the flare on the line between the flare and the nut that cups over the flare. If it's use was a gasket I would think it would be between the female flare and male flare, if that makes sense? I thought it would cause the nut to be tighter at the back of the flare.

I have my sediment bowl and line out of the car and hand lapped them together for a period of time trying to knock down any high spots. I believe I will do one of these copper washers just to be safe. I can't see it hurting anything. I'll bring this back up after I try it.

My line is steel and the sediment bowl/flare is cast pot metal? I don't think the copper washer would cause any problems, would it?
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Old 08-11-2019, 07:35 PM   #8
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Default Re: Flared copper washers for gaskets?

A lead gasket might work better in my OP. Take a lead wheel weight and pound it to about 1/16" thick and use hole punches.
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Old 08-11-2019, 07:39 PM   #9
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Default Re: Flared copper washers for gaskets?

If it is a proper double flare, you should have no problems
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Old 08-13-2019, 03:55 PM   #10
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Default Re: Flared copper washers for gaskets?

You can buy flare Gaskets already made from your local refrigeration supply house. If you’re making it by compressing a flat washer you’re already compressing the copper. The reason for the flare gasket is because the copper is already been compressed, so putting in a new uncompressed gasket gives you some tightening room and will seal. This is to save you a little bit a time from reflaring the copper the original fitting.
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Old 08-13-2019, 04:03 PM   #11
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Default Re: Flared copper washers for gaskets?

You can even buy them at Grainger or eBay...
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Old 08-13-2019, 08:16 PM   #12
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Default Re: Flared copper washers for gaskets?

The problem with those fittings is you only get a couple turns of thread engagement. Adding a washer takes away from the holding strength and weakens the joint. I heat the tube up with a Mapp torch before doing each of the double flare steps. Seems to work well for brake systems. I used to crack them at the seam before heating.
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Old 08-14-2019, 11:05 AM   #13
Jim Brierley
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Default Re: Flared copper washers for gaskets?

Copper lines: Copper will work harden IF it is allowed to flex or vibrate. In the 50's, etc., most production cars had a small copper line from the engine to the oil pressure gauge, I was a truck mechanic from 1956 to 1976 and never saw one crack or break. Trucks used copper air-brake lines, etc. etc. Copper has gotten a bad reputation, undeservedly! The bad reputation has been passed on by those that have never been associated with it.
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Old 08-14-2019, 11:37 AM   #14
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Default Re: Flared copper washers for gaskets?

Take a look at your air compressor, bet you will find a copper line between the pump and tank. Think about how much vibration and duty cycles it goes thru. Not all copper tubing is the same. I would agree that steel is best and to stay away from MODERN copper tubing (I think you will find it is harder). The material used to make it is not the same as OLD tubing, because of the EPA, things like lead were taken out. Flared tubing connection is not in my OP, going to have the same issues as using a ferrule and compression nut.
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Old 08-15-2019, 10:57 AM   #15
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Default Re: Flared copper washers for gaskets?

Quote:
Originally Posted by Jim Brierley View Post
Copper lines: Copper will work harden IF it is allowed to flex or vibrate. In the 50's, etc., most production cars had a small copper line from the engine to the oil pressure gauge, I was a truck mechanic from 1956 to 1976 and never saw one crack or break. Trucks used copper air-brake lines, etc. etc. Copper has gotten a bad reputation, undeservedly! The bad reputation has been passed on by those that have never been associated with it.

I agree with Jim !!! The only line - tubing that I've had to crack was a steel gas line on my roadster . We always put a loop in the copper gas line and that seemed to prevent cracking of the copper line .
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Old 08-15-2019, 11:20 AM   #16
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Default Re: Flared copper washers for gaskets?

You can get oversize ferrules for gas lines from both Bratton's (part #13491) and Snyder's (part # A-9244), both $7.95 a pair. A friend of mine makes them.
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Old 08-27-2019, 10:12 PM   #17
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Default Re: Flared copper washers for gaskets?

I tried my fuel line from the tank to the firewall and it leaked at the shutoff valve. I had just replaced an injector in a tbi system and had a plastic washer/gasket left over and tried it. It worked great and then I noticed the connection at the firewall to the sediment bowl was leaking. I went to the parts store and got another plastic washer and it worked on it. I assume the the flares aren't correct but they looked pretty good. Steel line FLARED not the ferrules.
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