"A double flare is used on soft aluminum tubing 3/8-inch outside diameter and under, and a single flare on all other tubing." AC43-13.1B, Para. 9-30, B.
Let's not forget we are trying to contain all of about 30 psi at the most. A double flare seems to me to be serious overkill.
Conical seals, AS4824C02, might be a solution if your flared end has a leak. An easier solution would be to heat the flared end of the copper tube until it is glowing red and then immerse it in water to anneal it.
Broken Fuel Primer
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
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lowNslow
- Posts: 1535
- Joined: Mon Apr 22, 2002 4:20 pm
Re: Broken Fuel Primer
Thanks Gary. I was assuming that the tubing was cracked but if not annealing may work.n2582d wrote:"A double flare is used on soft aluminum tubing 3/8-inch outside diameter and under, and a single flare on all other tubing." AC43-13.1B, Para. 9-30, B.
Let's not forget we are trying to contain all of about 30 psi at the most. A double flare seems to me to be serious overkill.
Conical seals, AS4824C02, might be a solution if your flared end has a leak. An easier solution would be to heat the flared end of the copper tube until it is glowing red and then immerse it in water to anneal it.
Karl
'53 170B N3158B SN:25400
ASW-20BL
'53 170B N3158B SN:25400
ASW-20BL
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blueldr
- Posts: 4442
- Joined: Thu May 02, 2002 3:16 am
Re: Broken Fuel Primer
I had a '55 for a while and I replumbed the primer system to both manifolds AND all six cylinders. I did not double flare any of the 1/8th inch copper tubes.
My double flaring tool will not work on double flaring 1/8th inch tubing. There were no leaks.
My double flaring tool will not work on double flaring 1/8th inch tubing. There were no leaks.
BL
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GAHorn
- Posts: 21295
- Joined: Fri Apr 12, 2002 8:45 pm
Re: Broken Fuel Primer
Revisiting this thread I realized I never answered this question.... Here's a 1/8" double flaring tool:lowNslow wrote:George, are you sure about this? I have never seen a flaring tool that will double flare 1/8" tubing for AN fittings.gahorn wrote:1/8" copper line must be "double-flared" in order to properly seal.
http://imperial-tools.com/products/flaring-tools
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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n2582d
- Posts: 3013
- Joined: Mon Apr 29, 2002 4:58 am
Re: Broken Fuel Primer
George,
As you (but many 170 owners don't) know 45 degree flares, the kind made by the Imperial double-flare tool you linked to, is for automotive applications. AN fittings use 37 degree flares. A moot point perhaps? On my '52 170b the primer lines are all single flare.
As you (but many 170 owners don't) know 45 degree flares, the kind made by the Imperial double-flare tool you linked to, is for automotive applications. AN fittings use 37 degree flares. A moot point perhaps? On my '52 170b the primer lines are all single flare.
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Gary
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GAHorn
- Posts: 21295
- Joined: Fri Apr 12, 2002 8:45 pm
Re: Broken Fuel Primer
It's not a moot point...it's an important one. Yes, aircraft use 37-degree flares....and one reason the double flare is so useful is that it's forgiving of such minor diffs.
My post was primarily to point out that double flare tools are available in 1/8" sizes.
My post was primarily to point out that double flare tools are available in 1/8" sizes.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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