---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 10/15/16: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:50 PM - Sticky start? (greg.barnhard@gmail.com) 2. 03:14 PM - Re: Sticky start? (Hank Gibson) 3. 03:34 PM - Re: Sticky start? (Ernest Martinez) 4. 03:45 PM - Re: Sticky start? (greg.barnhard@gmail.com) 5. 04:23 PM - Re: Re: Sticky start? (Robin Hou) 6. 04:25 PM - Re: Re: Sticky start? (Roger Kemp) 7. 04:56 PM - Re: Sticky start? (A. Dennis Savarese) 8. 04:59 PM - Re: Re: Sticky start? (Hank Gibson) 9. 07:47 PM - Re: Sticky start? (greg.barnhard@gmail.com) ________________________________ Message 1 _____________________________________ Time: 02:50:52 PM PST US Subject: Yak-List: Sticky start? From: "greg.barnhard@gmail.com" Hello everyone, Please bear with me as I'm still pretty new to the Yak world and trying to wrap my head around everything. The last couple of flights I did (last dozen or so) I had to push the start button multiple times (and while holding) to actually get the prop to turn over. As soon as I pushed the button I could hear the shower of sparks immediately but no start valve or air. The battery voltage was plenty good 24.5 - 25 volts at a minimum. I'm trying to figure out if this might be a solenoid issue or a sticky start valve. Any thoughts, suggestion, advice? Thanks so much. Greg Yak 52W Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461314#461314 ________________________________ Message 2 _____________________________________ Time: 03:14:32 PM PST US From: Hank Gibson Subject: Re: Yak-List: Sticky start? Hi Greg- Sounds like your QDF-1 start solenoid/valve is sticking and failing. The lower pneumatic portion of the valve is very prone to corrosion. Craig Payne did a nice article for Red Alert a year or so ago that gives great advice on the care and feeding of the often forgotten QDF. Doug also sells a re-build kit for the lower portion. Try manually overriding the electrical (shower of sparks) side next start by pushing down on the tab on the valve (right firewall) and see how it responds. Two person operation of course. Maybe Craig or someone can post that article. I'll try to find it myself and send it to you offline. Hoot Sent from my iPhone > On Oct 15, 2016, at 2:49 PM, "greg.barnhard@gmail.com" wrote: > > > Hello everyone, > > Please bear with me as I'm still pretty new to the Yak world and trying to wrap my head around everything. > > The last couple of flights I did (last dozen or so) I had to push the start button multiple times (and while holding) to actually get the prop to turn over. As soon as I pushed the button I could hear the shower of sparks immediately but no start valve or air. The battery voltage was plenty good 24.5 - 25 volts at a minimum. I'm trying to figure out if this might be a solenoid issue or a sticky start valve. Any thoughts, suggestion, advice? > > Thanks so much. > Greg > Yak 52W > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=461314#461314 > > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 03:34:41 PM PST US From: Ernest Martinez Subject: Re: Yak-List: Sticky start? Low air pressure? On Saturday, October 15, 2016, greg.barnhard@gmail.com < greg.barnhard@gmail.com> wrote: > greg.barnhard@gmail.com > > > Hello everyone, > > Please bear with me as I'm still pretty new to the Yak world and trying to > wrap my head around everything. > > The last couple of flights I did (last dozen or so) I had to push the > start button multiple times (and while holding) to actually get the prop to > turn over. As soon as I pushed the button I could hear the shower of sparks > immediately but no start valve or air. The battery voltage was plenty good > 24.5 - 25 volts at a minimum. I'm trying to figure out if this might be a > solenoid issue or a sticky start valve. Any thoughts, suggestion, advice? > > Thanks so much. > Greg > Yak 52W > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=461314#461314 > > ________________________________ Message 4 _____________________________________ Time: 03:45:19 PM PST US Subject: Yak-List: Re: Sticky start? From: "greg.barnhard@gmail.com" Ernie, the air pressure isn't low, almost always 5 on the gauge. Hoot, that sounds about right. I'll have to try that. If you could find a link that would be awesome...in the mean time I'm going to search for that. Is that the only major area that sees corrosion or are there other places I should look as well? Thanks! Greg Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461318#461318 ________________________________ Message 5 _____________________________________ Time: 04:23:39 PM PST US From: Robin Hou Subject: Re: Yak-List: Re: Sticky start? Flash your starter valve with WD40 should get you going for awhile, but you are likely to need a valve overhaul in the very near future. Sent from Yahoo Mail on Android On Sat, Oct 15, 2016 at 15:44, greg.barnhard@gmail.com Ernie, the air pressure isn't low, almost always 5 on the gauge. Hoot, that sounds about right. I'll have to try that. If you could find a l ink that would be awesome...in the mean time I'm going to search for that. Is that the only major area that sees corrosion or are there other places I should look as well? Thanks! Greg Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461318#461318 S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 6 _____________________________________ Time: 04:25:56 PM PST US Subject: Re: Yak-List: Re: Sticky start? From: Roger Kemp Go to the RPA website. It will be in archieves. Doc Sent from my iPad > On Oct 15, 2016, at 5:44 PM, "greg.barnhard@gmail.com" wrote: > > > Ernie, the air pressure isn't low, almost always 5 on the gauge. > > Hoot, that sounds about right. I'll have to try that. If you could find a link that would be awesome...in the mean time I'm going to search for that. > > Is that the only major area that sees corrosion or are there other places I should look as well? > > Thanks! > Greg > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=461318#461318 > > > > > > > > > > ________________________________ Message 7 _____________________________________ Time: 04:56:33 PM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: Sticky start? If it's a Yak 52, you're not going to like this job.=C2- If a CJ, it's a piece of cake. Remove the air start valve and either disassemble and clean it or call Doug Sapp and order a new air start valve and replace it.=C2- There are set s crews on the sides of the hex head.=C2- So be sure to loosen them before you attempt to disassemble it. If it's a Yak 52, there should be a small tab on the side which is used to manually engage the air start valve using the side of the sole of your shoe .=C2- If you decide to replace it, ask Doug if he has one with the tab on the side. Dennis From: "greg.barnhard@gmail.com" To: yak-list@matronics.com Sent: Saturday, October 15, 2016 5:49 PM Subject: Yak-List: Sticky start? ail.com> Hello everyone, Please bear with me as I'm still pretty new to the Yak world and trying to wrap my head around everything. The last couple of flights I did (last dozen or so) I had to push the start button multiple times (and while holding) to actually get the prop to turn over. As soon as I pushed the button I could hear the shower of sparks imm ediately but no start valve or air. The battery voltage was plenty good 24. 5 - 25 volts at a minimum. I'm trying to figure out if this might be a sole noid issue or a sticky start valve. Any thoughts, suggestion, advice? Thanks so much. Greg Yak 52W Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461314#461314 S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 8 _____________________________________ Time: 04:59:45 PM PST US From: Hank Gibson Subject: Re: Yak-List: Re: Sticky start? Greg- If you mean just the start system (which has few components) downstream of the QDF-1 then the next item is the air distributor (spider web of metal tubes "hub") on the engine accessory case which could cause starting issues but it is typically not an issue unless it has been tampered with as it is factory set. There are 9 individual air check valves (one on each cylinder) that can corrode. If one fails though it is a very obvious leak and the prop will stop on that cylinder. Upstream of the solenoid your main air valve can leak and I recommend you replace the steel needle valve with a SS one which Doug has. I am confident it is your QDF-1 once you rule out the Main air valve. The pneumatic system has 44 items which are ALL prone to corrosion and can cause different issues. Replace all springs and needle valves with Stainless Steel and rebuild, clean, change desiccant often and upgrade where possible to keep your system as healthy as possible. Do it all at once or over time but the pneumatic system probably causes by far the most gripes in our birds than any of the other aircraft systems combined. Fortunately Doug has all items you need to maintain and upgrade to SS and Jill can now rebuild gear/flap valves. Good luck!! Hoot Sent from my iPhone > On Oct 15, 2016, at 3:44 PM, "greg.barnhard@gmail.com" wrote: > > > Ernie, the air pressure isn't low, almost always 5 on the gauge. > > Hoot, that sounds about right. I'll have to try that. If you could find a link that would be awesome...in the mean time I'm going to search for that. > > Is that the only major area that sees corrosion or are there other places I should look as well? > > Thanks! > Greg > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=461318#461318 > > > > > > > > > > ________________________________ Message 9 _____________________________________ Time: 07:47:18 PM PST US Subject: Yak-List: Re: Sticky start? From: "greg.barnhard@gmail.com" Once the valve opens it starts just fine. The issue is getting the valve to open once the start button is pushed. It is on a Yak 52W, so I had a feeling none of this would be fun. Is the valve and solenoid separate or are they apart of the same unit aka replace one you're replacing both. I'm still learning about how this plane was cared for by the previous owner for the past 16 years (since new) so it's a learning experience. Thanks again for everyone's patience dealing with the new guy. I'm doing a lot of work on it this winter and would prefer to get as much done as possible now while everything is opened up. It sounds like stainless is the way to go with the pneumatic system. Thanks! Greg Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461328#461328 ------------------------------------------------------------------------------------- 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.