---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Fri 09/14/12: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:02 PM - Yak 55 Tailwheel Spring & Tailwheel Yoke (Epistaxis) 2. 08:37 PM - Yak18t air leak (Andrew Park) ________________________________ Message 1 _____________________________________ Time: 08:02:21 PM PST US Subject: Yak-List: Yak 55 Tailwheel Spring & Tailwheel Yoke From: "Epistaxis" FOR SALE: Tailwheel Spring and Tailwheel yoke for YAK 55. These Guys came in my spares package and I doubt that I will ever use them. So it`s time for them to go. Both items are in excellent condition. If interested contact me via my Email address....Epistaxis1@aol.com... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=383138#383138 ________________________________ Message 2 _____________________________________ Time: 08:37:32 PM PST US From: "Andrew Park" Subject: Yak-List: Yak18t air leak I realise this topic is probably worn thru with you all but Im relatively new to the Yak and a little hesitant to go rushing in. When I went up to the plane a couple of days ago I did the usual start up procedure and noticed a hissing sound coming from the front somewhere. I also noticed the air pressure dropping very slowly. Opened up the cowls and on the left-hand side of the firewall is a device Approx 250mm long, grey in colour and I presume it's a blow off relief valve for the compressor. It has 3 pipes connected to it, one from the compressor, one exhaust which exits to the bottom of the fuselage and another pipe which disappears thru the fire wall. The hissing sound is coming from the exhaust at the bottom of the fuselage and when I put my finger over it, the air then escapes from around the plate which is screwed to the grey device (I suspect the relief valve for when the compressor exceeds the required pressure). I started the engine to let pressure build up and its stays up to where it should be in flight, however after engine shut down the pressure drops away after about an hour. I presume this valve assembly is the problem, what do you all think? If I dismantle the unit, what am I likely to find and what is the likely fix? Is it an O ring failure, seal etc? Your help would be much appreciated..AJ ========================================================== ------------------------------------------------------------------------------------- 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.