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
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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
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| Subject: | Re: 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" <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
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| Subject: | Re: Sticky start? |
Low air pressure?
On Saturday, October 15, 2016, greg.barnhard@gmail.com <
greg.barnhard@gmail.com> wrote:
> greg.barnhard@gmail.com <javascript:;>>
>
> 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
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| Subject: | Re: Sticky start? |
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
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| Subject: | 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<greg.barnhard@gmai
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
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| Subject: | Re: Sticky start? |
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" <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
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| Subject: | Re: 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" <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
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| Subject: | 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" <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
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| Subject: | Re: Sticky start? |
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
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