Today's Message Index:
----------------------
1. 08:19 AM - Valves inspection (Javier Carrasco Ballesteros)
2. 01:04 PM - Valves inspection (Bitterlich, Mark G CIV NAVAIR, WD)
3. 01:17 PM - Re: Valves inspection (Walter Lannon)
4. 01:37 PM - Re: Valves inspection (Looigi)
5. 01:45 PM - Re: Valves inspection (Jon Boede)
6. 02:43 PM - Re: Re: Valves inspection (Robin Hou)
7. 02:44 PM - Re: Re: Valves inspection (A. Dennis Savarese)
8. 05:26 PM - Re: Re: Valves inspection (A. Dennis Savarese)
Message 1
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| Subject: | Valves inspection |
Hello everyone,
It is annual inspection for my Yak-55, M-14P.
I have read a lot about the sticky valve issue, and asked the mechanics to
check on them.
He said that he needs to remove the cylinder top covers, remove the spring
and manually move them.
If the stick then he will remove the valve and clean the shaft.
Have any of you done the same procedure, agree/disagree or have any other s
uggestion to things to check for while he is at it?
Thanks,
Javier Carrasco
Yak-55 N5245H
Sent from Mail for Windows 10
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| Subject: | Valves inspection |
I was waiting for someone else to reply, but I guess not.
First, the only issue I know regarding "sticking valves" is due to carbon buildup,
and yes it is possible for this to get into the valve guides, but that almost
always impacts the valves not seating properly and is typically found during
a differential compression test, where air leaks through the exhaust valve
into the exhaust pipes and is easy to detect just by listening. Another viable
method is to inspect the valves with a type of borescope or miniature camera,
which today are pretty cheap.
Second, I have never in my life heard of a person suggesting that they remove the
valve springs, which means also removing the valve keeps, which can easily
result in the valve dropping down into the chamber stopping at the piston. Of
course there is always the Indian Rope Trick of stuffing rope through a spark
plug hole into the cylinder to prevent this. So my input is that doing this
at a yearly Conditional Inspection without proof of any problem to begin with
is way way over the top. As far as "removing the valve to clean the shaft", that
means pulling the whole cylinder off. There has been more than one person
that has dropped small parts down into the engine while yanking a cylinder of
an M-14, so my NEXT question would be: "How much actual experience does your
mechanic have on M-14 engines, and how many cylinders (if any) has he ever pulled
off?
I could be totally mistaken, but given what you related in your posting, it sounds
to me as if he is planning on gaining experience .... on your engine.
It is not necessary to remove valve keepers and springs and attempt to judge valve
movement during a Conditional Inspection. It is not called for in any task
manual from the Russians, and is not practiced by any M-14 owner that I am aware
of. I'll leave this for others to chime in on. My offer would be that a
compression test done while the engine is hot will quickly show any carbon build
up on the valve or seat, which normally happens before it makes it's way
into the valve guide. Regardless a borescope will show it in great detail and
should be considered as a first step way before taking apart valves or cylinders.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of Javier Carrasco Ballesteros
Sent: Wednesday, July 18, 2018 11:20 AM
Subject: [Non-DoD Source] Yak-List: Valves inspection
Hello everyone,
It is annual inspection for my Yak-55, M-14P.
I have read a lot about the sticky valve issue, and asked the mechanics to check
on them.
He said that he needs to remove the cylinder top covers, remove the spring and
manually move them.
If the stick then he will remove the valve and clean the shaft.
Have any of you done the same procedure, agree/disagree or have any other suggestion
to things to check for while he is at it?
Thanks,
Javier Carrasco
Yak-55 N5245H
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
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| Subject: | Re: Valves inspection |
Only two things I would recommend at this time:------
1. Start using MMM in the fuel and
2. Get a new mechanic.
Walt
From: Javier Carrasco Ballesteros
Sent: Wednesday, July 18, 2018 8:19 AM
Subject: Yak-List: Valves inspection
Hello everyone,
It is annual inspection for my Yak-55, M-14P.
I have read a lot about the sticky valve issue, and asked the mechanics to
check on them.
He said that he needs to remove the cylinder top covers, remove the spring
and manually move them.
If the stick then he will remove the valve and clean the shaft.
Have any of you done the same procedure, agree/disagree or have any other s
uggestion to things to check for while he is at it?
Thanks,
Javier Carrasco
Yak-55 N5245H
Sent from Mail for Windows 10
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Message 4
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| Subject: | Re: Valves inspection |
Hi Javier,
As an A&P who has my own yak-52 I echo Mark comments. The only time you should
be doing pulling bits off your airplane is for routine maintenance or when something
is busted.
Pulling cylinders for an inspection is, in my opinion, not a smart idea. A good
analogy would be open heart surgery to have a look at your heart valves! You
are introducing the risk of infant mortality unnecessarily.
Do a leak down test and bung a boroscope into each cylinder and have a look around
that way. A failing valve will stand out a mile if you know what you are
looking for. There is a very good series of videos on Youtube by a guy called
Mike Busch (Savy Aviator), one on valves. While Mike has much bigger balls than
I do when it comes to maintenance his principles are sound and he gives good
and well thought out advice.
The moral of my story is the old saying.... If it is not broke, don't fix it!
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481735#481735
Message 5
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| Subject: | Re: Valves inspection |
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Message 6
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| Subject: | Re: Valves inspection |
Not a M14-p owner, but my Housai will shake and growl with sticky valve.
After shut off, the offending cylinder will be colder to touch compare with
others. I have had good luck feeding my Housai with MMO in oil and fuel to
cure sticky valve. No need to remove a cylinder for 6 years and over 300
hours.
On Wed, Jul 18, 2018 at 1:46 PM Looigi <cdoburton@gmail.com> wrote:
>
> Hi Javier,
>
> As an A&P who has my own yak-52 I echo Mark comments. The only time you
> should be doing pulling bits off your airplane is for routine maintenance
> or when something is busted.
>
> Pulling cylinders for an inspection is, in my opinion, not a smart idea.
> A good analogy would be open heart surgery to have a look at your heart
> valves! You are introducing the risk of infant mortality unnecessarily.
>
> Do a leak down test and bung a boroscope into each cylinder and have a
> look around that way. A failing valve will stand out a mile if you know
> what you are looking for. There is a very good series of videos on Youtube
> by a guy called Mike Busch (Savy Aviator), one on valves. While Mike has
> much bigger balls than I do when it comes to maintenance his principles are
> sound and he gives good and well thought out advice.
>
> The moral of my story is the old saying.... If it is not broke, don't fix
> it!
>
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481735#481735
>
>
Message 7
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| Subject: | Re: Valves inspection |
Concur 110% with Walt.=C2- Add it to the oil religiously.=C2- I would a
lso add a quart or even 2 to the oil and run the engine a couple of hours.
=C2- You'll be amazed at how MMO will remove the varnish on the valve/val
ve guide which is causing the sticking valve.Dennis
From: Looigi <cdoburton@gmail.com>
To: yak-list@matronics.com
Sent: Wednesday, July 18, 2018 4:39 PM
Subject: Yak-List: Re: Valves inspection
Hi Javier,
As an A&P who has my own yak-52 I echo Mark comments.=C2- The only time y
ou should be doing pulling bits off your airplane is for routine maintenanc
e or when something is busted.
Pulling cylinders for an inspection is, in my opinion, not a smart idea.=C2
- A good analogy would be open heart surgery to have a look at your heart
valves!=C2- You are introducing the risk of infant mortality unnecessari
ly.
Do a leak down test and bung a boroscope into each cylinder and have a look
around that way.=C2- A failing valve will stand out a mile if you know w
hat you are looking for.=C2- There is a very good series of videos on You
tube by a guy called Mike Busch (Savy Aviator), one on valves.=C2- While
Mike has much bigger balls than I do when it comes to maintenance his princ
iples are sound and he gives good and well thought out advice.
The moral of my story is the old saying.... If it is not broke, don't fix i
t!
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481735#481735
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 8
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| Subject: | Re: Valves inspection |
I meant add it to the fuel religiously. Add a coding to instructions on the c
ontainer.
Dennis
Sent from my iPad
> On Jul 18, 2018, at 5:44 PM, A. Dennis Savarese <dsavarese0812@bellsouth.n
et> wrote:
>
> Concur 110% with Walt. Add it to the oil religiously. I would also add a
quart or even 2 to the oil and run the engine a couple of hours. You'll be
amazed at how MMO will remove the varnish on the valve/valve guide which is
causing the sticking valve.
> Dennis
>
>
> From: Looigi <cdoburton@gmail.com>
> To: yak-list@matronics.com
> Sent: Wednesday, July 18, 2018 4:39 PM
> Subject: Yak-List: Re: Valves inspection
>
>
> Hi Javier,
>
> As an A&P who has my own yak-52 I echo Mark comments. The only time you s
hould be doing pulling bits off your airplane is for routine maintenance or w
hen something is busted.
>
> Pulling cylinders for an inspection is, in my opinion, not a smart idea. A
good analogy would be open heart surgery to have a look at your heart valve
s! You are introducing the risk of infant mortality unnecessarily.
>
> Do a leak down test and bung a boroscope into each cylinder and have a loo
k around that way. A failing valve will stand out a mile if you know what y
ou are looking for. There is a very good series of videos on Youtube by a g
uy called Mike Busch (Savy Aviator), one on valves. While Mike has much big
ger balls than I do when it comes to maintenance his principles are sound an
d he gives good and well thought out advice.
>
> The moral of my story is the old saying.... If it is not broke, don't fix i
t!
>
> Chris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481735#481735
>
>
>
>
>
> Archive Search & Download, 7-Day Browse, Chat, FAQ,
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