Today's Message Index:
----------------------
1. 04:22 AM - Re: Nanchang Air System (A. Dennis Savarese)
2. 04:37 AM - Re: Nanchang Air System (A. Dennis Savarese)
3. 05:54 AM - Re: Nanchang Air System (Gary Gabbard)
4. 06:07 AM - Re: Nanchang Air System (Ernest Martinez)
5. 09:14 AM - Fires in Wa (Larry Pine)
6. 09:47 AM - Re: Nanchang Air System (jblake207@comcast.net)
7. 10:56 AM - Re: Nanchang Air System (A. Dennis Savarese)
8. 10:57 AM - Re: Nanchang Air System (A. Dennis Savarese)
9. 11:17 AM - Re: Nanchang Air System (jblake207@comcast.net)
10. 11:43 AM - Re: Nanchang Air System (Bitterlich, Mark G CIV NAVAIR, WD)
11. 04:19 PM - Re: Nanchang Air System (Robin Hou)
12. 04:43 PM - Re: Nanchang Air System (A. Dennis Savarese)
13. 09:53 PM - Re: Nanchang Air System (Walter Lannon)
Message 1
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| Subject: | Re: Nanchang Air System |
To help you troubleshoot the leak, first fill the air tanks.=C2- Immediat
ely after you remove the fill hose connection to the airplane, either spray
some soapy water on the external air fill port or put some saliva on the p
ort opening.=C2- If it bubbles, you have a leaking check valve. =C2- Us
ually when an air tank leaks down that fast, the check valve that prevents
that from happening is remaining open.
As Ernie points out, rebuilding all the check valves (with new SS parts fro
m Doug Sapp) will reduce the probability of having a leaking check valve in
the future.Dennis
From: Ernest Martinez <erniel29@gmail.com>
To: "yak-list@matronics.com" <yak-list@matronics.com>
Sent: Thursday, August 20, 2015 8:43 PM
Subject: Re: Yak-List: Nanchang Air System
It's all due to global warming. 14 years ago there was a=C2-lot less CO2
in the air. Air is mostly nitrogen, and nitrogen is the largest molecule in
air, so it has a hard time leaking past seals. But now that we have so muc
h more smaller CO2 molecules in the air, it's now much more slippery than i
t was 14 years ago, so it leaks past your seals that much more readily.
I installed aCO2 scrubber from a submarine just upstream of my air compress
or, in order to fatten up my air.
I also rebuilt my check valves, I found, that=C2-=C2-they were leaking
slightly past the lead washer.
Ernie
On Thursday, August 20, 2015, Byron Fox <byronmfox@gmail.com> wrote:
14 years ago, I'd turn the main air off and come back a week later to
discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
Units -=C2- or whatever) still in the plumbing south of the main shutoff
valve.
To maintain this happy state of affairs over time, I've overhauled the
gear actuators, replaced front and back seat gear and flap valves, and
routinely service check and shuttle valves.
That brings us to today. Shut off the main air. Go to lunch. Come back
in 45 minutes. Air in the plumbing - zero. WTF!
So:
1. Balloon tested gear actuators. No seeping.
W2. All firewall check valves
overhauled within past month.
3. Pop off valve overhauled.
There=C2-
4. New snot valve.
5. Put a/c on jacks, put front gear and flap handles in neutral
position bleeding off down pressure on gear actuators and up pressure
on flap. Plumbing still bleeding off rapidly.
Granted, this is no big deal. The compressor brings the stored air up
quickly. It's me just being anal.
But before I go through all the check valves again, does anybody have
a bright idea?
Thanks,
Blitz Fox
415-307-2405
List" target="_blank">http://www.matronics.com/Navigator?Yak-List
FORUMS -
_blank">http://forums.matronics.com
b Site -
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
target="_blank">http://www.matronics.com/contribution
Message 2
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| Subject: | Re: Nanchang Air System |
Let's talk about the leak at lunch today.=C2- I'm sure I can help you tro
ubleshoot and hopefully isolate the cause of the leak.
Dennis
From: Roger Kemp <f16viperdoc@me.com>
To: "yak-list@matronics.com" <yak-list@matronics.com>
Sent: Thursday, August 20, 2015 9:51 PM
Subject: Re: Yak-List: Nanchang Air System
Developing a crack in the aluminum lines. Where is the manic question. Leak
ing around B nuts would be another. Don't forget your new check valves can
go TU too.
I'm still chasing a leak in my 52. But, I have only replaced half of my che
ck valves.
I'm getting to old for this! Bring back hydraulics! They freeking leak so y
ou at least get a clue of the general place in the airframe it is coming fr
om! There is enough dried soapy spray in my fuselage to wash the aircraft f
or a year.
Doc
Doc
Sent from my iPad
> On Aug 20, 2015, at 8:05 PM, Byron Fox <byronmfox@gmail.com> wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units -=C2- or whatever) still in the plumbing south of the main shutof
f
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
>
> Blitz Fox
> 415-307-2405
>
>
>
>
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 3
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| Subject: | Re: Nanchang Air System |
I just recently found the pressure supply line from the left hand side of rear
cockpit from the tee fitting coming thru the floor to the pressure input port
of the rear flap control valve. Was leaking, no amount of trying to tighten the
"B" nuts on the line would stop the leak. Made a new one of 1/4 inch 5052-0
aluminum tubing. Use AN819-4D sleeve couplings on the new line, and very slightly
drill the hole in the Chinese "B" nut to fit the AN819-4D diameter of the
U.S. sleeve.
Check the diameter of the U.S. sleeve and drill hole in the "B" nut so the sleeve
just slides thru the "B"nut. Works good.
Gary in LAS. CJ N22YK.
Sent from my iPhone
> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units - or whatever) still in the plumbing south of the main shutoff
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
>
> Blitz Fox
> 415-307-2405
>
>
>
>
Message 4
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| Subject: | Re: Nanchang Air System |
Careful with tightening the B-Nuts, you will flatten and work harden the
flare, and it will break. And it won't break immediately, it will break
later on after some vibration. I know this first hand, I had one break in
flight, and there are points in our air system where if you open the air
system, even the Emergency air will leak out and prevent a total gear
extension, namely the air supply line in the font cockpit flap valve.
Ernie
On Fri, Aug 21, 2015 at 8:51 AM, Gary Gabbard <ggg6@att.net> wrote:
>
> I just recently found the pressure supply line from the left hand side of
> rear cockpit from the tee fitting coming thru the floor to the pressure
> input port of the rear flap control valve. Was leaking, no amount of trying
> to tighten the "B" nuts on the line would stop the leak. Made a new one of
> 1/4 inch 5052-0 aluminum tubing. Use AN819-4D sleeve couplings on the new
> line, and very slightly drill the hole in the Chinese "B" nut to fit the
> AN819-4D diameter of the U.S. sleeve.
> Check the diameter of the U.S. sleeve and drill hole in the "B" nut so the
> sleeve just slides thru the "B"nut. Works good.
>
> Gary in LAS. CJ N22YK.
>
> Sent from my iPhone
>
> > On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
> >
> >
> > 14 years ago, I'd turn the main air off and come back a week later to
> > discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> > Units - or whatever) still in the plumbing south of the main shutoff
> > valve.
> >
> > To maintain this happy state of affairs over time, I've overhauled the
> > gear actuators, replaced front and back seat gear and flap valves, and
> > routinely service check and shuttle valves.
> >
> > That brings us to today. Shut off the main air. Go to lunch. Come back
> > in 45 minutes. Air in the plumbing - zero. WTF!
> >
> > So:
> >
> > 1. Balloon tested gear actuators. No seeping.
> >
> > 2. All firewall check valves
> > overhauled within past month.
> >
> > 3. Pop off valve overhauled.
> >
> > 4. New snot valve.
> >
> > 5. Put a/c on jacks, put front gear and flap handles in neutral
> > position bleeding off down pressure on gear actuators and up pressure
> > on flap. Plumbing still bleeding off rapidly.
> >
> > Granted, this is no big deal. The compressor brings the stored air up
> > quickly. It's me just being anal.
> > But before I go through all the check valves again, does anybody have
> > a bright idea?
> >
> > Thanks,
> >
> >
> >
> > Blitz Fox
> > 415-307-2405
> >
> >
> >
> >
>
>
Message 5
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I know the fires are getting close to Doug Sapp up there in Omak. Hope all remains
ok with you and your wife, Doug and prayers being sent that the fires are
extinguished fast without further lose of live.
Larry Pine
Message 6
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| Subject: | Re: Nanchang Air System |
I recently experienced a leak in my air system and chased it for weeks... n
ever found it using soapy water method.=C2-=C2-Using a friend's Freon l
eak detector, I shot a small amount of Freon into the system (had to do som
e=C2-re-engineering on hoses fittings to make it work with the Freon bott
le and airplane Schrader valve)=C2-=C2-and then filled the system to ab
out 10 atmospheres with compressed air... opened the main air valve to allo
w the Freon access to the entire system.=C2- Using the Freon sniffer, I f
ound a couple of leaks... taking Doug Sapp's advice, used non-hardening avi
ation grade thread sealant (sort of like Loctite) on the threads, rebuilt a
couple of the check valves, replaced the valve core in the Schrader valve
(main fill point) with a high pressure valve core... now she holds air.=C2
-
=C2-
Freon and freon sniffer were the keys to finding those small irritating lea
ks.=C2-
=C2-
JB
Sent from my iPhone
> On Aug 20, 2015, at 18:05, Byron Fox < byronmfox@gmail.com > wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units -=C2- or whatever) still in the plumbing south of the main shutof
f
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
>
> Blitz Fox
> 415-307-2405
>
>
>
>
===========
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or?Yak-List
===========
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
===========
b Site -
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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===
Message 7
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| Subject: | Re: Nanchang Air System |
As a suggestion, you should really remove the valve core from the external
air fill port John.=C2- The check valves in the system are there for a re
ason.=C2- They are suppose to prevent the air from dumping overboard.=C2
- The Schrader valve on the external air fill port is nothing more than a
n adapter for the hose used to fill the bottles.=C2- Just because the Sch
rader valve comes with a valve core when it was purchased, does not mean it
has to remain in the Schrader valve.
I know,...... you're going to say the valve core is a backup.=C2- But it
also can be a trouble shooting hindrance if one of the check valves protect
ing the main or emergency air system is leaking.=C2- With the valve core
out, if the check valve leaks, you'll be able to see bubbles at the externa
l air fill port with just a finger of saliva on the opening or spraying soa
py water on the opening.
Dennis
From: "jblake207@comcast.net" <jblake207@comcast.net>
To: Yak-List <yak-list@matronics.com>
Sent: Friday, August 21, 2015 11:43 AM
Subject: Re: Yak-List: Nanchang Air System
I recently experienced a leak in my air system and chased it for weeks... n
ever found it using soapy water method.=C2-=C2-Using a friend's Freon l
eak detector, I shot a small amount of Freon into the system (had to do som
e=C2-re-engineering on hoses fittings to make it work with the Freon bott
le and airplane Schrader valve)=C2-=C2-and then filled the system to ab
out 10 atmospheres with compressed air... opened the main air valve to allo
w the Freon access to the entire system.=C2- Using the Freon sniffer, I f
ound a couple of leaks... taking Doug Sapp's advice, used non-hardening avi
ation grade thread sealant (sort of like Loctite) on the threads, rebuilt a
couple of the check valves, replaced the valve core in the Schrader valve
(main fill point) with a high pressure valve core... now she holds air.=C2
- =C2-Freon and freon sniffer were the keys to finding those small irri
tating leaks.=C2- =C2-JB
Sent from my iPhone
> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units -=C2- or whatever) still in the plumbing south of the main shutof
f
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
> Blitz Fox
> 415-307-2405
>
>
List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigat
or?Yak-List
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
b Site -
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
et=_blank>http://www.matronics.com/Navigator?Yak-List
p://forums.matronics.com
blank>http://www.matronics.com/contribution
Message 8
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| Subject: | Re: Nanchang Air System |
Sometimeswhen you over-tighten a B nut, you'll fracture the flare in the
tubing. Then you'll have to do exactly what Gary did.
If you detect a leak from around a B nut, remove the nut and carefully
examine the tubing flare for a hairline crack. As the B nut is
tightened, the hairline crack gets widerandthus the leak can not be
stopped by tightening the nut.
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 8/21/2015 7:51 AM, Gary Gabbard wrote:
>
> I just recently found the pressure supply line from the left hand side of rear
cockpit from the tee fitting coming thru the floor to the pressure input port
of the rear flap control valve. Was leaking, no amount of trying to tighten
the "B" nuts on the line would stop the leak. Made a new one of 1/4 inch 5052-0
aluminum tubing. Use AN819-4D sleeve couplings on the new line, and very slightly
drill the hole in the Chinese "B" nut to fit the AN819-4D diameter of
the U.S. sleeve.
> Check the diameter of the U.S. sleeve and drill hole in the "B" nut so the sleeve
just slides thru the "B"nut. Works good.
>
> Gary in LAS. CJ N22YK.
>
> Sent from my iPhone
>
>> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>>
>>
>> 14 years ago, I'd turn the main air off and come back a week later to
>> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
>> Units - or whatever) still in the plumbing south of the main shutoff
>> valve.
>>
>> To maintain this happy state of affairs over time, I've overhauled the
>> gear actuators, replaced front and back seat gear and flap valves, and
>> routinely service check and shuttle valves.
>>
>> That brings us to today. Shut off the main air. Go to lunch. Come back
>> in 45 minutes. Air in the plumbing - zero. WTF!
>>
>> So:
>>
>> 1. Balloon tested gear actuators. No seeping.
>>
>> 2. All firewall check valves
>> overhauled within past month.
>>
>> 3. Pop off valve overhauled.
>>
>> 4. New snot valve.
>>
>> 5. Put a/c on jacks, put front gear and flap handles in neutral
>> position bleeding off down pressure on gear actuators and up pressure
>> on flap. Plumbing still bleeding off rapidly.
>>
>> Granted, this is no big deal. The compressor brings the stored air up
>> quickly. It's me just being anal.
>> But before I go through all the check valves again, does anybody have
>> a bright idea?
>>
>> Thanks,
>>
>>
>>
>> Blitz Fox
>> 415-307-2405
>>
>>
>>
>>
>
>
Message 9
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| Subject: | Re: Nanchang Air System |
My CJ doesn't have a check valve at the fill point.=C2- I asked Doug and
someone else (maybe Blitz or Selby??) and they said some CJs have the check
valve there and some don't and no rationale why or why not.=C2- I purcha
sed a new check valve and will install it just inside the Schrader valve.
=C2- JB
----- Original Message -----
From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
Sent: Friday, August 21, 2015 12:50:01 PM
Subject: Re: Yak-List: Nanchang Air System
As a suggestion, you should really remove the valve core from the external
air fill port John.=C2- The check valves in the system are there for a re
ason.=C2- They are suppose to prevent the air from dumping overboard.=C2
- The Schrader valve on the external air fill port is nothing more than a
n adapter for the hose used to fill the bottles.=C2- Just because the Sch
rader valve comes with a valve core when it was purchased, does not mean it
has to remain in the Schrader valve.
I know,...... you're going to say the valve core is a backup.=C2- But it
also can be a trouble shooting hindrance if one of the check valves protect
ing the main or emergency air system is leaking.=C2- With the valve core
out, if the check valve leaks, you'll be able to see bubbles at the externa
l air fill port with just a finger of saliva on the opening or spraying soa
py water on the opening.
Dennis
From: "jblake207@comcast.net" <jblake207@comcast.net>
Sent: Friday, August 21, 2015 11:43 AM
Subject: Re: Yak-List: Nanchang Air System
I recently experienced a leak in my air system and chased it for weeks... n
ever found it using soapy water method.=C2-=C2-Using a friend's Freon l
eak detector, I shot a small amount of Freon into the system (had to do som
e=C2-re-engineering on hoses fittings to make it work with the Freon bott
le and airplane Schrader valve)=C2-=C2-and then filled the system to ab
out 10 atmospheres with compressed air... opened the main air valve to allo
w the Freon access to the entire system.=C2- Using the Freon sniffer, I f
ound a couple of leaks... taking Doug Sapp's advice, used non-hardening avi
ation grade thread sealant (sort of like Loctite) on the threads, rebuilt a
couple of the check valves, replaced the valve core in the Schrader valve
(main fill point) with a high pressure valve core... now she holds air.=C2
-
=C2-
Freon and freon sniffer were the keys to finding those small irritating lea
ks.=C2-
=C2-
JB
Sent from my iPhone
> On Aug 20, 2015, at 18:05, Byron Fox < byronmfox@gmail.com > wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units -=C2- or whatever) still in the plumbing south of the main shutof
f
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
>
> Blitz Fox
> 415-307-2405
>
>
>
>
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Message 10
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| Subject: | Nanchang Air System |
And then there is THIS approach. Flare seals.
http://www.flaretite.com/flaretite.php
https://www.pegasusautoracing.com/productselection.asp?Product=3202
Of course you have to kind of WAG the AN size to Metric, but both have 37 degree
flares, so they can be used.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: Friday, August 21, 2015 1:54 PM
Subject: Re: Yak-List: Nanchang Air System
--> <dsavarese0812@bellsouth.net>
Sometimeswhen you over-tighten a B nut, you'll fracture the flare in the tubing.
Then you'll have to do exactly what Gary did.
If you detect a leak from around a B nut, remove the nut and carefully examine
the tubing flare for a hairline crack. As the B nut is tightened, the hairline
crack gets widerandthus the leak can not be stopped by tightening the nut.
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 8/21/2015 7:51 AM, Gary Gabbard wrote:
>
> I just recently found the pressure supply line from the left hand side of rear
cockpit from the tee fitting coming thru the floor to the pressure input port
of the rear flap control valve. Was leaking, no amount of trying to tighten
the "B" nuts on the line would stop the leak. Made a new one of 1/4 inch 5052-0
aluminum tubing. Use AN819-4D sleeve couplings on the new line, and very slightly
drill the hole in the Chinese "B" nut to fit the AN819-4D diameter of
the U.S. sleeve.
> Check the diameter of the U.S. sleeve and drill hole in the "B" nut so the sleeve
just slides thru the "B"nut. Works good.
>
> Gary in LAS. CJ N22YK.
>
> Sent from my iPhone
>
>> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>>
>>
>> 14 years ago, I'd turn the main air off and come back a week later to
>> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
>> Units - or whatever) still in the plumbing south of the main shutoff
>> valve.
>>
>> To maintain this happy state of affairs over time, I've overhauled
>> the gear actuators, replaced front and back seat gear and flap
>> valves, and routinely service check and shuttle valves.
>>
>> That brings us to today. Shut off the main air. Go to lunch. Come
>> back in 45 minutes. Air in the plumbing - zero. WTF!
>>
>> So:
>>
>> 1. Balloon tested gear actuators. No seeping.
>>
>> 2. All firewall check valves
>> overhauled within past month.
>>
>> 3. Pop off valve overhauled.
>>
>> 4. New snot valve.
>>
>> 5. Put a/c on jacks, put front gear and flap handles in neutral
>> position bleeding off down pressure on gear actuators and up pressure
>> on flap. Plumbing still bleeding off rapidly.
>>
>> Granted, this is no big deal. The compressor brings the stored air up
>> quickly. It's me just being anal.
>> But before I go through all the check valves again, does anybody have
>> a bright idea?
>>
>> Thanks,
>>
>>
>>
>> Blitz Fox
>> 415-307-2405
>>
>>
>>
>>
>
>
Message 11
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| Subject: | Re: Nanchang Air System |
Although it has not happen to me (knock on wood),=C2-how do you properly
tighten a B-nut without over tighten it?
On Friday, August 21, 2015 11:10 AM, A. Dennis Savarese <dsavarese0812
@bellsouth.net> wrote:
uth.net>
Sometimeswhen you over-tighten a B nut, you'll fracture the flare in the
tubing. Then you'll have to do exactly what Gary did.
If you detect a leak from around a B nut, remove the nut and carefully
examine the tubing flare for a hairline crack.=C2- As the B nut is
tightened, the hairline crack gets widerandthus the leak can not be
stopped by tightening the nut.
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 8/21/2015 7:51 AM, Gary Gabbard wrote:
>
> I just recently found the pressure supply line from the left hand side of
rear cockpit from the tee fitting coming thru the floor to the pressure in
put port of the rear flap control valve. Was leaking, no amount of trying t
o tighten the "B" nuts on the line would stop the leak.=C2- Made a new on
e of 1/4 inch 5052-0 aluminum tubing.=C2- Use AN819-4D sleeve couplings o
n the new line, and very slightly drill the hole in the Chinese "B" nut to
fit the AN819-4D diameter of the U.S. sleeve.
> Check the diameter of the U.S. sleeve and drill hole in the "B" nut so th
e sleeve just slides thru the "B"nut.=C2- Works good.
>
> Gary in LAS.=C2- CJ=C2- N22YK.
>
> Sent from my iPhone
>
>> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>>
>>
>> 14 years ago, I'd turn the main air off and come back a week later to
>> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
>> Units -=C2- or whatever) still in the plumbing south of the main shuto
ff
>> valve.
>>
>> To maintain this happy state of affairs over time, I've overhauled the
>> gear actuators, replaced front and back seat gear and flap valves, and
>> routinely service check and shuttle valves.
>>
>> That brings us to today. Shut off the main air. Go to lunch. Come back
>> in 45 minutes. Air in the plumbing - zero. WTF!
>>
>> So:
>>
>> 1. Balloon tested gear actuators. No seeping.
>>
>> 2. All firewall check valves
>> overhauled within past month.
>>
>> 3. Pop off valve overhauled.
>>
>> 4. New snot valve.
>>
>> 5. Put a/c on jacks, put front gear and flap handles in neutral
>> position bleeding off down pressure on gear actuators and up pressure
>> on flap. Plumbing still bleeding off rapidly.
>>
>> Granted, this is no big deal. The compressor brings the stored air up
>> quickly. It's me just being anal.
>> But before I go through all the check valves again, does anybody have
>> a bright idea?
>>
>> Thanks,
>>
>>
>>
>> Blitz Fox
>> 415-307-2405
>>
>>
>>
>>
>
>
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 12
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| Subject: | Re: Nanchang Air System |
It's on the firewall.=C2- Regardless of where it's located, it has to hav
e one for each; main and emergency.
Dennis
From: "jblake207@comcast.net" <jblake207@comcast.net>
To: Yak-List <yak-list@matronics.com>
Sent: Friday, August 21, 2015 1:13 PM
Subject: Re: Yak-List: Nanchang Air System
My CJ doesn't have a check valve at the fill point.=C2- I asked Doug and
someone else (maybe Blitz or Selby??) and they said some CJs have the check
valve there and some don't and no rationale why or why not.=C2- I purcha
sed a new check valve and will install it just inside the Schrader valve.
=C2- JB
From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
Sent: Friday, August 21, 2015 12:50:01 PM
Subject: Re: Yak-List: Nanchang Air System
As a suggestion, you should really remove the valve core from the external
air fill port John.=C2- The check valves in the system are there for a re
ason.=C2- They are suppose to prevent the air from dumping overboard.=C2
- The Schrader valve on the external air fill port is nothing more than a
n adapter for the hose used to fill the bottles.=C2- Just because the Sch
rader valve comes with a valve core when it was purchased, does not mean it
has to remain in the Schrader valve.
I know,...... you're going to say the valve core is a backup.=C2- But it
also can be a trouble shooting hindrance if one of the check valves protect
ing the main or emergency air system is leaking.=C2- With the valve core
out, if the check valve leaks, you'll be able to see bubbles at the externa
l air fill port with just a finger of saliva on the opening or spraying soa
py water on the opening.
Dennis
From: "jblake207@comcast.net" <jblake207@comcast.net>
Sent: Friday, August 21, 2015 11:43 AM
Subject: Re: Yak-List: Nanchang Air System
I recently experienced a leak in my air system and chased it for weeks... n
ever found it using soapy water method.=C2-=C2-Using a friend's Freon l
eak detector, I shot a small amount of Freon into the system (had to do som
e=C2-re-engineering on hoses fittings to make it work with the Freon bott
le and airplane Schrader valve)=C2-=C2-and then filled the system to ab
out 10 atmospheres with compressed air... opened the main air valve to allo
w the Freon access to the entire system.=C2- Using the Freon sniffer, I f
ound a couple of leaks... taking Doug Sapp's advice, used non-hardening avi
ation grade thread sealant (sort of like Loctite) on the threads, rebuilt a
couple of the check valves, replaced the valve core in the Schrader valve
(main fill point) with a high pressure valve core... now she holds air.=C2
- =C2-Freon and freon sniffer were the keys to finding those small irri
tating leaks.=C2- =C2-JB
Sent from my iPhone
> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units -=C2- or whatever) still in the plumbing south of the main shutof
f
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
> Blitz Fox
> 415-307-2405
>
>
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or?Yak-List
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
b Site -
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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Message 13
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| Subject: | Re: Nanchang Air System |
All CJ=99s have a check valves in the charging circuits.
Technically they are =9Ccheck valve =93 non-return=9D
as compared to =9Ccheck valve =93 restricted flow=9D.
The Schrader valve is simply a local modification to enable charging
with western facilities. The Schrader valve core is totally
unnecessary.
Walt
From: jblake207@comcast.net
Sent: Friday, August 21, 2015 11:13 AM
Subject: Re: Yak-List: Nanchang Air System
My CJ doesn't have a check valve at the fill point. I asked Doug and
someone else (maybe Blitz or Selby??) and they said some CJs have the
check valve there and some don't and no rationale why or why not. I
purchased a new check valve and will install it just inside the Schrader
valve. JB
-------------------------------------------------------------------------
-------
From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
Sent: Friday, August 21, 2015 12:50:01 PM
Subject: Re: Yak-List: Nanchang Air System
As a suggestion, you should really remove the valve core from the
external air fill port John. The check valves in the system are there
for a reason. They are suppose to prevent the air from dumping
overboard. The Schrader valve on the external air fill port is nothing
more than an adapter for the hose used to fill the bottles. Just
because the Schrader valve comes with a valve core when it was
purchased, does not mean it has to remain in the Schrader valve.
I know,...... you're going to say the valve core is a backup. But it
also can be a trouble shooting hindrance if one of the check valves
protecting the main or emergency air system is leaking. With the valve
core out, if the check valve leaks, you'll be able to see bubbles at the
external air fill port with just a finger of saliva on the opening or
spraying soapy water on the opening.
Dennis
-------------------------------------------------------------------------
-------
From: "jblake207@comcast.net" <jblake207@comcast.net>
Sent: Friday, August 21, 2015 11:43 AM
Subject: Re: Yak-List: Nanchang Air System
I recently experienced a leak in my air system and chased it for
weeks... never found it using soapy water method. Using a friend's
Freon leak detector, I shot a small amount of Freon into the system (had
to do some re-engineering on hoses fittings to make it work with the
Freon bottle and airplane Schrader valve) and then filled the system to
about 10 atmospheres with compressed air... opened the main air valve to
allow the Freon access to the entire system. Using the Freon sniffer, I
found a couple of leaks... taking Doug Sapp's advice, used non-hardening
aviation grade thread sealant (sort of like Loctite) on the threads,
rebuilt a couple of the check valves, replaced the valve core in the
Schrader valve (main fill point) with a high pressure valve core... now
she holds air.
Freon and freon sniffer were the keys to finding those small irritating
leaks.
JB
Sent from my iPhone
> On Aug 20, 2015, at 18:05, Byron Fox <byronmfox@gmail.com> wrote:
>
>
> 14 years ago, I'd turn the main air off and come back a week later to
> discover there was still 30+ atmospheres (or CMUs - Chinese Mystery
> Units - or whatever) still in the plumbing south of the main shutoff
> valve.
>
> To maintain this happy state of affairs over time, I've overhauled the
> gear actuators, replaced front and back seat gear and flap valves, and
> routinely service check and shuttle valves.
>
> That brings us to today. Shut off the main air. Go to lunch. Come back
> in 45 minutes. Air in the plumbing - zero. WTF!
>
> So:
>
> 1. Balloon tested gear actuators. No seeping.
>
> 2. All firewall check valves
> overhauled within past month.
>
> 3. Pop off valve overhauled.
>
> 4. New snot valve.
>
> 5. Put a/c on jacks, put front gear and flap handles in neutral
> position bleeding off down pressure on gear actuators and up pressure
> on flap. Plumbing still bleeding off rapidly.
>
> Granted, this is no big deal. The compressor brings the stored air up
> quickly. It's me just being anal.
> But before I go through all the check valves again, does anybody have
> a bright idea?
>
> Thanks,
>
>
> Blitz Fox
> 415-307-2405
>
>
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target="_blank">http://www.matronics.com/Navigator?Yak-List
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