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Air leak

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Saj

Joined: 30 Mar 2019
Posts: 7

Posted: Tue Mar 08, 2022 12:12 pm Post subject: Air leak

Does anyone have a suggestion on how to locate a slow leak on in the main air system of a Yak 52? I replaced the pressure relief piston, and that decreased, but did not eliminate my leak. Air will take a week to bleed down to being too low to start my plane. Is there any type of instrument that can detect air escaping? I’ve tried using a soap solution with no success and I can’t hear anything. I would like to identify the source of the leak prior to tearing the whole system apart. 



Steve

N9900X

Sent from my iPad

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dsavarese0812(at)bellsout
Guest

Posted: Tue Mar 08, 2022 6:40 pm Post subject: Air leak

Have you sprayed the soapy water on the external air fill port hole?  If you have a Schrader valve installed on the external air fill port and there is a valve core in the Schrader valve, remove the valve core permanently because the external air fill port is protected by a check valve.



FWIW, most Schrader valve cores are like the ones we find in tire tubes and valve stems on our automobiles are only good to about 150 PSI.  Needless to say, the pneumatic system pressure on the Yak and CJ far exceed 150 PSI. 



Dennis



Sent from my iPhone



 	  Quote: 	
		   On Mar 8, 2022, at 3:14 PM, Steven Johnson <sajdds(at)comcast.net> wrote:

 

 

 

 Does anyone have a suggestion on how to locate a slow leak on in the main air system of a Yak 52? I replaced the pressure relief piston, and that decreased, but did not eliminate my leak. Air will take a week to bleed down to being too low to start my plane. Is there any type of instrument that can detect air escaping? I’ve tried using a soap solution with no success and I can’t hear anything. I would like to identify the source of the leak prior to tearing the whole system apart. 

 

 Steve

 N9900X

 Sent from my iPad

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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richard.goode(at)russiana
Guest

Posted: Wed Mar 09, 2022 1:08 am Post subject: Air leak

A soap solution is the way to establish a leak, but of course you are not going to hear anything – you will simply see the bubbles! And indeed I would be fairly sure that while they might be very high-tech ways of finding an air leak, I'm sure they are not available for the kind of problems encountered on these Russian aircraft!

RICHARD GOODE AEROBATICS

Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK

Tel:  +44 (0)1544 340120   Fax:  +44 (0)1544 340129

e-mail: richard.goode(at)russianaeros.com

www.russianaeros.com

WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

In partnership with Aerometal Kft, Hungary.



--

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pennington.construction.i
Guest

Posted: Wed Mar 09, 2022 3:45 am Post subject: Air leak

I found every leak on my CJ using a leak detection fluid called. Snoop.     We used it in instrument sensing systems in the field to find leaks in anything that had pressure in it.  

I like it because when it dries it is gone.  No soap residue. 

It is on Amazon for about 10 bucks for 8 ounces. That will last you a very long time. 

But soap works to.👍

  

Mark

N621CJ 



On Wed, Mar 9, 2022 at 4:13 AM Richard Goode <richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)> wrote:



[quote]--> Yak-List message posted by: "Richard Goode" <richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)>

 

 A soap solution is the way to establish a leak, but of course you are not going to hear anything – you will simply see the bubbles! And indeed I would be fairly sure that while they might be very high-tech ways of finding an air leak, I'm sure they are not available for the kind of problems encountered on these Russian aircraft!

 

 

 RICHARD GOODE AEROBATICS

 Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK

 Tel:  +44 (0)1544 340120   Fax:  +44 (0)1544 340129

 e-mail: richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)

 www.russianaeros.com

 WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

 In partnership with Aerometal Kft, Hungary.

 

 --

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Clouddog

Joined: 02 Jun 2016
Posts: 119
Location: Lebanon, TN

Posted: Wed Mar 09, 2022 6:22 am Post subject: Air leak

Steve,



Ah the world of air leaks. We all go thru this on a constant basis and through the years we have all tried different methods. We have converted metal lines to high tech flex lines, changed alves to swagelocks and the list goes on. I have had a nick in a line that would open up at 50 atms bleeding the system down to 20 atms over a day or two and seal back up! 

I have invested in a high-end ultrasonic leak detector that can hear a fly fart at 20 feet and yet, I am still running nunning down a leak in my emergency air system! On the a CJ6  the emmergency air system is as simple as it gets wihen it comes to the plumbing. I have converted all the lines to flex line,  removed the rear valve, replaced the front valve and of course rebuilt the check valve. I have been told that a leak can develope within the actual pressure gage that is impossible to detect so that is my next step while my engine is being overhauled by Richard Goode. 

I know none of what I just said sheds any light on your dilemma but if  you own a YAK or CJ you just step back on occasions and when you do find the leak, take a deep breath and like Captain Ahab would yell at Moby Dick.... "Thar she blows.

Greg Clouddog Wrobel

On Tue, Mar 8, 2022, 14:16 Steven Johnson <sajdds(at)comcast.net (sajdds(at)comcast.net)> wrote:



 	  Quote: 	
		  --> Yak-List message posted by: Steven Johnson <sajdds(at)comcast.net (sajdds(at)comcast.net)>

 

 Does anyone have a suggestion on how to locate a slow leak on in the main air system of a Yak 52? I replaced the pressure relief piston, and that decreased, but did not eliminate my leak. Air will take a week to bleed down to being too low to start my plane. Is there any type of instrument that can detect air escaping? I’ve tried using a soap solution with no success and I can’t hear anything. I would like to identify the source of the leak prior to tearing the whole system apart. 

 

 Steve

 N9900X

 Sent from my iPad

 

 ===========

 List" rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/Navigator?Yak-List

 ===========

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 eferrer noreferrer" target="_blank">http://forums.matronics.com

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 WIKI -

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 b Site -

           -Matt Dralle, List Admin.

 ="noreferrer noreferrer" target="_blank">https://matronics.com/contribution

 ===========

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marty.jpm(at)gmail.com
Guest

Posted: Wed Mar 09, 2022 7:00 am Post subject: Air leak

👍😂



Le mer. 9 mars 2022, 15:27, Greg Wrobel <clouddog22(at)gmail.com (clouddog22(at)gmail.com)> a écrit :



 	  Quote: 	
		  Steve,



Ah the world of air leaks. We all go thru this on a constant basis and through the years we have all tried different methods. We have converted metal lines to high tech flex lines, changed alves to swagelocks and the list goes on. I have had a nick in a line that would open up at 50 atms bleeding the system down to 20 atms over a day or two and seal back up! 

I have invested in a high-end ultrasonic leak detector that can hear a fly fart at 20 feet and yet, I am still running nunning down a leak in my emergency air system! On the a CJ6  the emmergency air system is as simple as it gets wihen it comes to the plumbing. I have converted all the lines to flex line,  removed the rear valve, replaced the front valve and of course rebuilt the check valve. I have been told that a leak can develope within the actual pressure gage that is impossible to detect so that is my next step while my engine is being overhauled by Richard Goode. 

I know none of what I just said sheds any light on your dilemma but if  you own a YAK or CJ you just step back on occasions and when you do find the leak, take a deep breath and like Captain Ahab would yell at Moby Dick.... "Thar she blows.

Greg Clouddog Wrobel

On Tue, Mar 8, 2022, 14:16 Steven Johnson <sajdds(at)comcast.net (sajdds(at)comcast.net)> wrote:



 	  Quote: 	
		  --> Yak-List message posted by: Steven Johnson <sajdds(at)comcast.net (sajdds(at)comcast.net)>

 

 Does anyone have a suggestion on how to locate a slow leak on in the main air system of a Yak 52? I replaced the pressure relief piston, and that decreased, but did not eliminate my leak. Air will take a week to bleed down to being too low to start my plane. Is there any type of instrument that can detect air escaping? I’ve tried using a soap solution with no success and I can’t hear anything. I would like to identify the source of the leak prior to tearing the whole system apart. 

 

 Steve

 N9900X

 Sent from my iPad

 

 ===========

 List" rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/Navigator?Yak-List

 ===========

  FORUMS -

 eferrer noreferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

 errer noreferrer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 ="noreferrer noreferrer" target="_blank">https://matronics.com/contribution

 ===========

- The Matronics Yak-List Email Forum -

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LawnDart

Joined: 05 Jun 2006
Posts: 64

Posted: Wed Mar 09, 2022 8:30 am Post subject: Re: Air leak

I would also add - obtain and study the air system schematic.  You should be able to narrow down the possible leak points, thus a good starting point for the search.



i.e. in this case, with main valve closed, but still having a leak-down, it points to one check-valve on the outside firewall in the "tee" where the relief valve is located.  That valve, if not closing, will allow air to leak out the external fill port.

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Todd Peterson

Joined: 08 Nov 2010
Posts: 2
Location: 000

Posted: Wed Mar 09, 2022 2:38 pm Post subject: Air leak

Sir, I have heard of a device that is an amplified microphone it looks something like a stethoscope. Or a handheld Doppler that vascular surgeons use. I believe the technique is to slowly move the transducer over the entire air system and when you get to the micro leak that is vexing you, you will hear the air escaping.

On Tue, Mar 8, 2022 at 6:44 PM Anthony Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: Anthony Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>

 Have you sprayed the soapy water on the external air fill port hole?  If you have a Schrader valve installed on the external air fill port and there is a valve core in the Schrader valve, remove the valve core permanently because the external air fill port is protected by a check valve.

 FWIW, most Schrader valve cores are like the ones we find in tire tubes and valve stems on our automobiles are only good to about 150 PSI.  Needless to say, the pneumatic system pressure on the Yak and CJ far exceed 150 PSI. 

 Dennis

 Sent from my iPhone

 > On Mar 8, 2022, at 3:14 PM, Steven Johnson <sajdds(at)comcast.net (sajdds(at)comcast.net)> wrote:

 > 

 > --> Yak-List message posted by: Steven Johnson <sajdds(at)comcast.net (sajdds(at)comcast.net)>

 > 

 > Does anyone have a suggestion on how to locate a slow leak on in the main air system of a Yak 52? I replaced the pressure relief piston, and that decreased, but did not eliminate my leak. Air will take a week to bleed down to being too low to start my plane. Is there any type of instrument that can detect air escaping? I’ve tried using a soap solution with no success and I can’t hear anything. I would like to identify the source of the leak prior to tearing the whole system apart. 

 > 

 > Steve

 > N9900X

 > Sent from my iPad

 > 

 > 

 > 

 > 

 ===========

 List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Yak-List

 ===========

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 ="noreferrer" target="_blank">https://matronics.com/contribution

 ===========

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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