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Yak 52 Air Leaks

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bcbcbc

Joined: 19 Feb 2011
Posts: 3

Posted: Sat Feb 19, 2011 11:51 am Post subject: Yak 52 Air Leaks

Hello all, my Yak has a bleed down air leak that takes about 2 days, thus making it hard to detect.  I've replaced the pop off valve piston and the air filler check valve.  The main air shutoff valve has been checked good.  Thus the leak is between the air filler check valve and the main air shutoff valve.  That seems to only leave air lines and B nuts and perhaps flared tube end cracks.  Has anyone else had a slow leak, what did you do, and what turned out to be the problem, so I can intelligently hone in on what the problem might be, instead of tearing everything apart.  I can still fly alright since the compressor overcomes the slow leak, but I'd like to see that main air gage park itself at 40 or 50.  The emergency side is tight as a drum.  Thanks all.

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sat Feb 19, 2011 12:48 pm Post subject: Yak 52 Air Leaks

Those problems can be pesky, but since it doesn't appear to be leaking in, try slathering all fittings, etc. with soapy water. 

On Feb 19, 2011, at 2:51 PM, bcbcbc wrote:



 	  Quote: 	
		   

 

 Hello all, my Yak has a bleed down air leak that takes about 2 days, thus making it hard to detect.  I've replaced the opo off valve piston and the air filler check valve.  The main air shutoff valve has been checked good.  Thus the leak is between the air filler check valve and the main air shutoff valve.  That seems to only leave air lines and B nuts and perhaps flared tube end cracks.  Has anyone else had a slow leak, what did you do, and what turned out to be the problem, so I can intelligently hone in on what the problem might be, instead of tearing everything apart.  I can still fly alright since the compressor overcomes the slow leak, but I'd like to see that main air gage park itself at 40 or 50.  The emergency side is tight as a drum.  Thanks all.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=331551#331551

talew(at)bellsouth.net
Guest

Posted: Sat Feb 19, 2011 1:16 pm Post subject: Yak 52 Air Leaks

i have found that kid's bubble mix works well when applied with a small paint 

brush .

terry lewis



---

bcbcbc

Joined: 19 Feb 2011
Posts: 3

Posted: Sat Feb 19, 2011 1:35 pm Post subject: Re: Yak 52 Air Leaks

Excellent advice !!!  I figured that would be the next step, and rather simple to do at that.  Thanks for the prompt replies.

KingCJ6(at)aol.com
Guest

Posted: Sat Feb 19, 2011 3:05 pm Post subject: Yak 52 Air Leaks

An ultrasonic leak detector is the best way to go. One can aim it or just  have it in the proximity of a small leak and it will sound like a raging  river.  Good for areas you can't access and observe soapy water.   About $100 on E-Bay.

  

 Dave

  

  In a message dated 2/19/2011 1:37:51 P.M. Pacific Standard Time,  ghostemail(at)verizon.net writes:

  	  Quote: 	
		  -->    Yak-List message posted by: "bcbcbc"    <ghostemail(at)verizon.net>



Excellent advice !!!  I figured    that would be the next step, and rather simple to do at that.  Thanks for    the prompt replies.





Read this topic online    here:



http://forums.matronics.com/viewtopic.php?p=331558#331558===============================================

_-=   e  ties  Day  ================================================               - MATRONICS WEB FORUMS  ================================================             - List Contribution Web Site  sp;                             ===================================================



	


  [quote][b]

bcbcbc

Joined: 19 Feb 2011
Posts: 3

Posted: Sat Feb 19, 2011 3:20 pm Post subject: Re: Yak 52 Air Leaks

Another great idea. Thanks very much !!!

Vic

Joined: 12 Aug 2008
Posts: 116
Location: Southern Bavaria

Posted: Sat Feb 19, 2011 5:35 pm Post subject: Re: Yak 52 Air Leaks

Hello,



donÂ´t forget to check the lines to the manometer, they are rubber hoses in the 18 T, donÂ´t know about 52s. These hoses may be awkward to replace, so we had a leak there due to old age of the rubber. And yes, we had a develloping fracture in a pipe as well. Each time we could locate the problem by just listening carefully in a quiet hangar. A pressure system drop to zero in two days is quite a few gallons per hour. So IÂ´suggest you take a torch and listen carefully in the still of the night. Not knowing your age I would have advised to take a younger person with you for the job, but then a veteran of the techno generation would be quite useless at that. 

  Good luck with that one

cheers

Vic

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sat Feb 19, 2011 5:44 pm Post subject: Yak 52 Air Leaks

I can still hear Led Zepelin when it's quiet.

On Feb 19, 2011, at 8:35 PM, Vic wrote:



 	  Quote: 	
		   

 

 Hello,

 

 donÂ´t forget to check the lines to the manometer, they are rubber hoses in the 18 T, donÂ´t know about 52s. These hoses may be awkward to replace, so we had a leak there due to old age of the rubber. And yes, we had a develloping fracture in a pipe as well. Each time we could locate the problem by just listening carefully in a quiet hangar. A pressure system drop to zero in two days is quite a few gallons per hour. So IÂ´suggest you take a torch and listen carefully in the still of the night. Not knowing your age I would have advised to take a younger person with you for the job, but then a veteran of the techno generation would be quite useless at that. 

  Good luck with that one

 cheers

 Vic

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=331573#331573

Vic

Joined: 12 Aug 2008
Posts: 116
Location: Southern Bavaria

Posted: Sat Feb 19, 2011 7:14 pm Post subject: Re: Yak 52 Air Leaks

Hey,



Led Zeppelin tinnitus is quite allright ( though it does not help with the diagnosis for pneumatics ) !



cheers

Vic

hkgibby(at)yahoo.com
Guest

Posted: Sat Feb 19, 2011 9:41 pm Post subject: Yak 52 Air Leaks

Don't forget the gear and flap handles;  any and all can be the culprit;  Leaking rear gear handle is common.  Also, all four of your actuators (3 gear, 1 flap) can have leak-past internally.  Doug overhauled all of mine and it helped.  Finally, your two brake valves (reducing and differential) can go bad and be a source of leakage.  The Chinese made up overhaul kits for all these air system valves and tear them down every 100 hours I believe.  Doubt many of us do that... 



 Hank Gibson

904-738-3240 Mobile

904-213-1760 Home

hkgibby(at)yahoo.com (hkgibby(at)yahoo.com)

hkgibson(at)fnf.com (hkgibson(at)fnf.com)

  

--- On Sat, 2/19/11, bcbcbc <ghostemail(at)verizon.net> wrote:

  	  Quote: 	
		  

From: bcbcbc <ghostemail(at)verizon.net>

Subject: Yak 52 Air Leaks

To: yak-list(at)matronics.com

Date: Saturday, February 19, 2011, 2:51 PM



 --> Yak-List message posted by: "bcbcbc" <ghostemail(at)verizon.net (ghostemail(at)verizon.net)>



Hello all, my Yak has a bleed down air leak that takes about 2 days, thus making it hard to detect.  I've replaced the opo off valve piston and the air filler check valve.  The main air shutoff valve has been checked good.  Thus the leak is between the air filler check valve and the main air shutoff valve.  That seems to only leave air lines and B nuts and perhaps flared tube end cracks.  Has anyone else had a slow leak, what did you do, and what turned out to be the problem, so I can intelligently hone in on what the problem might be, instead of tearing everything apart.  I can still fly alright since the compressor overcomes the slow leak, but I'd like to see that main air gage park itself at 40 or  50.  The emergency side is tight as a drum.  Thanks all.





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=331551#331551



	


         [quote][b]

radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Sat Feb 19, 2011 9:46 pm Post subject: Yak 52 Air Leaks

shuttle valves, too

On Feb 20, 2011, at 12:37 AM, Hank Gibson wrote:

[quote]Don't forget the gear and flap handles;  any and all can be the culprit;  Leaking rear gear handle is common.  Also, all four of your actuators (3 gear, 1 flap) can have leak-past internally.  Doug overhauled all of mine and it helped.  Finally, your two brake valves (reducing and differential) can go bad and be a source of leakage.  The Chinese made up overhaul kits for all these air system valves and tear them down every 100 hours I believe.  Doubt many of us do that... 



 Hank Gibson

904-738-3240 Mobile

904-213-1760 Home

hkgibby(at)yahoo.com (hkgibby(at)yahoo.com)

hkgibson(at)fnf.com (hkgibson(at)fnf.com)

  

--- On Sat, 2/19/11, bcbcbc <ghostemail(at)verizon.net (ghostemail(at)verizon.net)> wrote:

  	  Quote: 	
		  

From: bcbcbc <ghostemail(at)verizon.net (ghostemail(at)verizon.net)>

Subject: Yak 52 Air Leaks

To: yak-list(at)matronics.com (yak-list(at)matronics.com)

Date: Saturday, February 19, 2011, 2:51 PM



 --> Yak-List message posted by: "bcbcbc" <ghostemail(at)verizon.net (ghostemail(at)verizon.net)>



Hello all, my Yak has a bleed down air leak that takes about 2 days, thus making it hard to detect.  I've replaced the opo off valve piston and the air filler check valve.  The main air shutoff valve has been checked good.  Thus the leak is between the air filler check valve and the main air shutoff valve.  That seems to only leave air lines and B nuts and perhaps flared tube end cracks.  Has anyone else had a slow leak, what did you do, and what turned out to be the problem, so I can intelligently hone in on what the problem might be, instead of tearing everything apart.  I can still fly alright since the compressor overcomes the slow leak, but I'd like to see that main air gage park itself at 40 or  50.  The emergency side is tight as a drum.  Thanks all.





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=331551#331551



[/url] 	
[url=http://www.matronics.com/Navigator?Yak-List]

    	  Quote: 	
		  

	
[b]

Vic

Joined: 12 Aug 2008
Posts: 116
Location: Southern Bavaria

Posted: Sun Feb 20, 2011 7:46 am Post subject: Re: Yak 52 Air Leaks

Hello,



the question here was, where does the air go when the main shut-off valve is closed ? 



Vic

wlannon(at)persona.ca
Guest

Posted: Sun Feb 20, 2011 9:24 am Post subject: Yak 52 Air Leaks

Usually past the corroded valve cone (and/or seat) in the main air valve. 

 	  Quote: 	
		  From there into the operating system where it will find a leak path to 

atmosphere.
	


Doug has new stainless steel cones to fix that problem.

Of course there are other things to check but not very many.  Leaking main 

air tank or fittings, pipeline cracks,  bad flares, cracked sleeves. cracked 

flare nuts.  Since there is only one pipeline this is easy.



Walt



 ----- 

From: "Vic" <vicmolnar(at)aol.com>

To: <yak-list(at)matronics.com>

Sent: Sunday, February 20, 2011 7:46 AM

Subject: Re: Yak 52 Air Leaks

 	  Quote: 	
		   



 Hello,



 the question here was, where does the air go when the main shut-off valve 

 is closed ?



 Vic





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=331612#331612

dsavarese0812(at)bellsout
Guest

Posted: Sun Feb 20, 2011 7:19 pm Post subject: Yak 52 Air Leaks

Although everything you say Hank is absolutely true, we need to 

remember, this is a Yak 52 leak and not a CJ6 leak.  With the main air 

valve turned off, none of the actuators, gear selectors or any other 

component in the system AFTER the main air valve can discharge the main 

air tank on the Yak 52.

Dennis



On 2/19/2011 11:37 PM, Hank Gibson wrote:

 	  Quote: 	
		   Don't forget the gear and flap handles; any and all can be the culprit;

 Leaking rear gear handle is common. Also, all four of your actuators (3

 gear, 1 flap) can have leak-past internally. Doug overhauled all of mine

 and it helped. Finally, your two brake valves (reducing and

 differential) can go bad and be a source of leakage. The Chinese made up

 overhaul kits for all these air system valves and tear them down every

 100 hours I believe. Doubt many of us do that...



 Hank Gibson

 904-738-3240 Mobile

 904-213-1760 Home

 hkgibby(at)yahoo.com <mailto:hkgibby(at)yahoo.com>

 hkgibson(at)fnf.com <mailto:hkgibson(at)fnf.com>

 --- On *Sat, 2/19/11, bcbcbc /<ghostemail(at)verizon.net>/* wrote:

     From: bcbcbc <ghostemail(at)verizon.net>

     Subject: Yak 52 Air Leaks

     To: yak-list(at)matronics.com

     Date: Saturday, February 19, 2011, 2:51 PM



     

     <http://us.mc367.mail.yahoo.com/mc/compose?to=ghostemail(at)verizon.net>>



     Hello all, my Yak has a bleed down air leak that takes about 2 days,

     thus making it hard to detect. I've replaced the opo off valve

     piston and the air filler check valve. The main air shutoff valve

     has been checked good. Thus the leak is between the air filler check

     valve and the main air shutoff valve. That seems to only leave air

     lines and B nuts and perhaps flared tube end cracks. Has anyone else

     had a slow leak, what did you do, and what turned out to be the

     problem, so I can intelligently hone in on what the problem might

     be, instead of tearing everything apart. I can still fly alright

     since the compressor overcomes the slow leak, but I'd like to see

     that main air gage park itself at 40 or 50. The emergency side is

     tight as a drum. Thanks all.





     Read this topic online here:



     http://forums.matronics.com/viewtopic.php?p=331551#331551

     <http://www.matronics.com/Navigator?Yak-List>

 *

 *

dsavarese0812(at)bellsout
Guest

Posted: Sun Feb 20, 2011 7:19 pm Post subject: Yak 52 Air Leaks

Also after the main air valve.  Can not discharge the main air tank with 

the main air valve turned off.

Dennis



On 2/19/2011 11:44 PM, Eric Wobschall wrote:

 	  Quote: 	
		   shuttle valves, too



 On Feb 20, 2011, at 12:37 AM, Hank Gibson wrote:



> Don't forget the gear and flap handles; any and all can be the

> culprit; Leaking rear gear handle is common. Also, all four of your

> actuators (3 gear, 1 flap) can have leak-past internally. Doug

> overhauled all of mine and it helped. Finally, your two brake valves

> (reducing and differential) can go bad and be a source of leakage. The

> Chinese made up overhaul kits for all these air system valves and tear

> them down every 100 hours I believe. Doubt many of us do that...

>

> Hank Gibson

> 904-738-3240 Mobile

> 904-213-1760 Home

> hkgibby(at)yahoo.com <mailto:hkgibby(at)yahoo.com>

> hkgibson(at)fnf.com <mailto:hkgibson(at)fnf.com>

> --- On *Sat, 2/19/11, bcbcbc /<ghostemail(at)verizon.net

> <mailto:ghostemail(at)verizon.net>>/* wrote:

>     From: bcbcbc <ghostemail(at)verizon.net <mailto:ghostemail(at)verizon.net>>

>     Subject: Yak 52 Air Leaks

>     To: yak-list(at)matronics.com <mailto:yak-list(at)matronics.com>

>     Date: Saturday, February 19, 2011, 2:51 PM

>

>     

>     <http://us.mc367.mail.yahoo.com/mc/compose?to=ghostemail(at)verizon.net>>

>

>     Hello all, my Yak has a bleed down air leak that takes about 2

>     days, thus making it hard to detect. I've replaced the opo off

>     valve piston and the air filler check valve. The main air shutoff

>     valve has been checked good. Thus the leak is between the air

>     filler check valve and the main air shutoff valve. That seems to

>     only leave air lines and B nuts and perhaps flared tube end

>     cracks. Has anyone else had a slow leak, what did you do, and what

>     turned out to be the problem, so I can intelligently hone in on

>     what the problem might be, instead of tearing everything apart. I

>     can still fly alright since the compressor overcomes the slow

>     leak, but I'd like to see that main air gage park itself at 40 or

>     50. The emergency side is tight as a drum. Thanks all.

>

>

>     Read this topic online here:

>

>     http://forums.matronics.com/viewtopic.php?p=331551#331551

>     <http://www.matronics.com/Navigator?Yak-List>

>     <http://www.matronics.com/Navigator?Yak-List>

>

> <http://www.matronics.com/Navigator?Yak-List>

> *

> *



 *

 *

dsavarese0812(at)bellsout
Guest

Posted: Sun Feb 20, 2011 7:20 pm Post subject: Yak 52 Air Leaks

Precisely!

Dennis



On 2/20/2011 9:46 AM, Vic wrote:

 	  Quote: 	
		   



 Hello,



 the question here was, where does the air go when the main shut-off valve is closed ?



 Vic





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=331612#331612

dsavarese0812(at)bellsout
Guest

Posted: Sun Feb 20, 2011 7:36 pm Post subject: Yak 52 Air Leaks

I have found with a leaking main air valve, one can simply disconnect 

the output side of the valve and spray with soapy water which if 

leaking, will definitely bubble.  Also with a leaking main air valve, 

the tell-tale sign is there is always brake pressure air.  ie: if one 

were to squeeze off all the residual air using the brake handle and let 

it sit for a few hours, then come back and more air can be squeezed off 

with the brake handle, then the main air valve is leaking.

One thing that is frequently overlooked in the 52 is the physical 

connections on the the air pressure instruments (front and rear 

cockpits).  On the 52, the main and emergency instruments are connected 

before the main air valve.  (Not so on the CJ6; main air instrument is 

connected after the main air valve).  I have found the 17mm nuts on the 

back side of the instrument loose on a few Yak 52's.  A real pain in the 

rear to get to AND tighten without twisting the instrument in the 

instrument mounting bracket.

Dennis

On 2/20/2011 11:19 AM, Walter Lannon wrote:

 	  Quote: 	

 Usually past the corroded valve cone (and/or seat) in the main air valve.

> From there into the operating system where it will find a leak path to

 atmosphere.

 Doug has new stainless steel cones to fix that problem.

 Of course there are other things to check but not very many. Leaking

 main air tank or fittings, pipeline cracks, bad flares, cracked sleeves.

 cracked flare nuts. Since there is only one pipeline this is easy.

 Walt

 ----- From: "Vic" <vicmolnar(at)aol.com>

 To: <yak-list(at)matronics.com>

 Sent: Sunday, February 20, 2011 7:46 AM

 Subject: Re: Yak 52 Air Leaks

> 

>

> Hello,

>

> the question here was, where does the air go when the main shut-off

> valve is closed ?

>

> Vic

>

>

> Read this topic online here:

>

> http://forums.matronics.com/viewtopic.php?p=331612#331612

>

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