---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 03/09/22: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:08 AM - Re: Air leak (Richard Goode) 2. 03:45 AM - Re: Air leak (Mark Pennington) 3. 06:22 AM - Re: Air leak (Greg Wrobel) 4. 07:00 AM - Re: Air leak (Jean-Philippe Martel) 5. 08:31 AM - Re: Air leak (LawnDart) 6. 02:38 PM - Re: Air leak (todd militarian) ________________________________ Message 1 _____________________________________ Time: 01:08:46 AM PST US From: "Richard Goode" Subject: RE: Yak-List: 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@russianaeros.com www.russianaeros.com WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES In partnership with Aerometal Kft, Hungary. -----Original Message----- From: owner-yak-list-server@matronics.com On Behalf Of Steven Johnson Sent: 08 March 2022 20:12 Subject: Yak-List: 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? Ive tried using a soap solution with no success and I cant 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 ________________________________ Message 2 _____________________________________ Time: 03:45:05 AM PST US From: Mark Pennington Subject: Re: Yak-List: 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.=F0=9F=91=8D Mark N621CJ On Wed, Mar 9, 2022 at 4:13 AM Richard Goode wrote: > richard.goode@russianaeros.com> > > A soap solution is the way to establish a leak, but of course you are not > going to hear anything =93 you will simply see the bubbles! And ind eed 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@russianaeros.com > www.russianaeros.com > WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES > In partnership with Aerometal Kft, Hungary. > > -----Original Message----- > From: owner-yak-list-server@matronics.com < > owner-yak-list-server@matronics.com> On Behalf Of Steven Johnson > Sent: 08 March 2022 20:12 > To: yak-list@matronics.com > Subject: Yak-List: 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=99ve tried using a soap solution wi th no > success and I can=99t hear anything. I would like to identify the s ource of > the leak prior to tearing the whole system apart. > > Steve > N9900X > Sent from my iPad > > =========== =========== =========== =========== =========== > > ________________________________ Message 3 _____________________________________ Time: 06:22:55 AM PST US From: Greg Wrobel Subject: Re: Yak-List: 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 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=99ve tried using a soap solution wi th no > success and I can=99t hear anything. I would like to identify the s ource of > the leak prior to tearing the whole system apart. > > Steve > N9900X > Sent from my iPad > =========== =========== =========== =========== =========== > > ________________________________ Message 4 _____________________________________ Time: 07:00:32 AM PST US From: Jean-Philippe Martel Subject: Re: Yak-List: Air leak =F0=9F=91=8D=F0=9F=98=82 Le mer. 9 mars 2022, 15:27, Greg Wrobel a =C3=A9crit : > 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 fl y > 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 simpl e > 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 m y > 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 wrote: > >> >> Does anyone have a suggestion on how to locate a slow leak on in the mai n >> 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=99ve tried using a soap solution w ith no >> success and I can=99t 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 >> ========== >> >> >> >> ________________________________ Message 5 _____________________________________ Time: 08:31:13 AM PST US Subject: Yak-List: Re: Air leak From: "LawnDart" 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. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506281#506281 ________________________________ Message 6 _____________________________________ Time: 02:38:12 PM PST US From: todd militarian Subject: Re: Yak-List: 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 wrote: > dsavarese0812@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 the re > 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 exce ed > 150 PSI. > > Dennis > > Sent from my iPhone > > > On Mar 8, 2022, at 3:14 PM, Steven Johnson wrote: > > .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=99ve tried using a soap solution > with no success and I can=99t hear anything. I would like to identi fy the > source of the leak prior to tearing the whole system apart. > > > > Steve > > N9900X > > Sent from my iPad > > > > > > > > > > =========== =========== =========== =========== =========== > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.