---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Mon 04/07/14: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:48 PM - Passing Gas (WENDELL JAEGER) 2. 05:39 PM - Re: Passing Gas (A. Dennis Savarese) 3. 09:01 PM - leaking main bottle and emergency bottle on Yak (Michael B. Cavanagh) 4. 09:01 PM - leaking main bottle and emergency bottle on Yak (Michael B. Cavanagh) ________________________________ Message 1 _____________________________________ Time: 02:48:41 PM PST US Subject: Yak-List: Passing Gas From: WENDELL JAEGER Hi, Guys Since my Yak had been dormant since October, I wasn't particularly alarmed when preparing for the first fire-up of the year I noticed the emergency ai r bottle had drained as empty as the main bottle. Although I didn't recall that happening last year, I figured it just all bled off from being down so long. But now both bottles are nearly depleted after just a couple days wh en I refill. Obviously there's a major leak somewhere. What I'm more intere sted in is why is my emergency air venting? When the main bottle emptied in the past the emergency bottle always remained at 100%. Does that mean a sh uttle valve is mispositioned? Leaking emergency valve? I went through all 3 shuttle valves and actuators last year as well as the "equalizing valve" i n the rear floor. The system was pretty tight when I parked it last Fall. T here is no audible hiss - and my airport gets pretty quiet at times. Still battling compressor issues, but....one thing at a time I guess. Anyone who' s "been there" and is willing to share would be most appreciated. Thanks!! -- Rico Jaeger Choir / Wausau East High School ________________________________ Message 2 _____________________________________ Time: 05:39:04 PM PST US Subject: Re: Yak-List: Passing Gas From: "A. Dennis Savarese" Check for a leak coming out of the external air fill port after you refill the bottles. It very well could be some crud inside the main and emergency check valves causing them not to close properly. Dennis On Apr 7, 2014, at 4:47 PM, WENDELL JAEGER wrote: > Hi, Guys > > Since my Yak had been dormant since October, I wasn't particularly alarmed when preparing for the first fire-up of the year I noticed the emergency air bottle had drained as empty as the main bottle. Although I didn't recall that happening last year, I figured it just all bled off from being down so long. But now both bottles are nearly depleted after just a couple days when I refill. Obviously there's a major leak somewhere. What I'm more interested in is why is my emergency air venting? When the main bottle emptied in the past the emergency bottle always remained at 100%. Does that mean a shuttle valve is mispositioned? Leaking emergency valve? I went through all 3 shuttle valves and actuators last year as well as the "equalizing valve" in the rear floor. The system was pretty tight when I parked it last Fall. There is no audible hiss - and my airport gets pretty quiet at times. Still battling compressor issues, but....one thing at a time I guess. Anyone who's "been there" and is willing to share would be most appreciated. > > Thanks!! > > -- > Rico Jaeger > Choir / Wausau East High School > > > > > > > > ~,=Z+M4Gqr{ (pppppppppppppppppppppppppppppppIQh Kj',.+-5h,{p"X,ZIJr*'0+ry'C { ,x(ZP3,jwfffp8m-&j',r5h.+-i0fr(Z(jB===============================08IaT1-I'j[(jzyh=jp+k&j',r+k&j',rkppppppppppppppppppppppppppppppp-*'gJ+^4jy2*. z.3jY^.+-p8m-&j',rr&*'i0fr((nb=============================={nrf ________________________________ Message 3 _____________________________________ Time: 09:01:52 PM PST US From: "Michael B. Cavanagh" Subject: Yak-List: leaking main bottle and emergency bottle on Yak I've had both. First time it was the main bottle and it was leaking out the fill port via the check valve on the firewall. Removed the check valve cleaned and removed the old hard seal and replaced with a new O-ring and fixed that. It's been good for 15 years since. Recently my Emergency tank also began to not hold pressure. I noticed when removing the the pneumatic fill valve cover on the side of the fuselage the tell tale pssst of air coming out. Normally there should be no air escaping here. Since the Main tank was holding pressure just fine, I knew the leak was coming from the emergency tank fill check valve just beside the fill port. Follow the tubing back from your emergency tank to the fill port and you will find the check valve. Very easy access from the rear cockpit. I took mine apart, and cleaned it. It has a spring and a small square piston with a donut shaped rubber seal on it's face. I soaked mine in STP Oil Treatment for rejuvenating seals, for a day, put it back together and it sealed up tight with no leak. In my case the Main tank leak was from the firewall mounted main system fill, check valve, and the Emergency tank was bleeding down through the emergency system fill check valve on the left side of the fuselage behind the rear seat. I also changed out my main system bottle with a 6000 psi kevlar wrapped aluminum O2 cylinder left over from a trip up Everest. It has a shutoff valve at the tank and I no longer suffer from a bled down main tank. Just DON'T forget to turn it, and the Main system valve, ON before you get in the cockpit. Checklist, first item! ________________________________ Message 4 _____________________________________ Time: 09:01:59 PM PST US From: "Michael B. Cavanagh" Subject: Yak-List: leaking main bottle and emergency bottle on Yak I've had both. First time it was the main bottle and it was leaking out the fill port via the check valve on the firewall. Removed the check valve cleaned and removed the old hard seal and replaced with a new O-ring and fixed that. It's been good for 15 years since. Recently my Emergency tank also began to not hold pressure. I noticed when removing the the pneumatic fill valve cover on the side of the fuselage the tell tale pssst of air coming out. Normally there should be no air escaping here. Since the Main tank was holding pressure just fine, I knew the leak was coming from the emergency tank fill check valve just beside the fill port. Follow the tubing back from your emergency tank to the fill port and you will find the check valve. Very easy access from the rear cockpit. I took mine apart, and cleaned it. It has a spring and a small square piston with a donut shaped rubber seal on it's face. I soaked mine in STP Oil Treatment for rejuvenating seals, for a day, put it back together and it sealed up tight with no leak. In my case the Main tank leak was from the firewall mounted main system fill, check valve, and the Emergency tank was bleeding down through the emergency system fill check valve on the left side of the fuselage behind the rear seat. I also changed out my main system bottle with a 6000 psi kevlar wrapped aluminum O2 cylinder left over from a trip up Everest. It has a shutoff valve at the tank and I no longer suffer from a bled down main tank. Just DON'T forget to turn it, and the Main system valve, ON before you get in the cockpit. Checklist, first item! ------------------------------------------------------------------------------------- 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.