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Carb discussion and canopy seal

 
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jill(at)m-14p.com
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PostPosted: Fri Mar 01, 2019 5:16 am    Post subject: Carb discussion and canopy seal Reply with quote

I have submitted the pix, but they are not posting for some reason. If you
want to view the pix, I will post on M-14P, inc. FB page.

Have a great weekend!

Jill

Group,

I am late to the discussion, but needed to clarify that an AK-14 diaphragm
can be utilized on the Huosai or AI-14 Carburetor (K-14). There are two
additional holes in the AK-14 diaphragm. These are of no consequence as it
is sealed between the two parts of the carburetor.

I do not have a Huosai carburetor apart, but I have attached photos of the
K-14 carburetor. The original carburetor diaphragm also has two additional
"blind holes" in a different location than the Ak-14 diaphragm, but
nonetheless, "holes to nowhere".

If there is still debate about why the Ak-14 diaphragm will not work, I
would like to hear the reason, as I am always open to learning.

The bigger issue, in my opinion, is people thinking that they can change out
a diaphragm and "fix" their carburetor. In all of the years that we have
been overhauling carburetors, we have only had 3 defective diaphragms.(None
resultant in a catastrophic failure.) It really is a testament to Russian
engineering. As Richard stated, the carburetors should be overhauled every
6 years, or so. There are numerous o-rings in the carburetor that go bad
with time and heat cycles. The butterfly shaft has 3 o-rings, alone. The
actuating assembly is in a lubricating bath of turbine oil. This area of the
carburetor is very close to #6 exhaust, so it is more common for these
o-rings to be a problem than a failing diaphragm. Sometimes, people mistake
leaking fluid from the bottom of the carburetor as fuel, but if they really
look and feel it, they may find it is turbine oil. The o-rings are no
longer doing their job on the butterfly shaft. The beauty of the Russian
design is that the o-rings serve as both a seal and a bearing surface, so
wear is minimal if the carburetors are overhauled at prescribed intervals.
Any use of Mo-Gas with ethanol will destroy the rubber bits in the
carburetor, fuel pump and even fuel hoses. Stay away from it.

Also, replying to the request this morning for Yak 52 canopy seals (leather)
- We stock them.
Jill Gernetzke
M-14P, Inc.


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richard.goode(at)russiana
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PostPosted: Fri Mar 01, 2019 5:50 am    Post subject: Carb discussion and canopy seal Reply with quote

Thank you, Jill, and that is largely correct. But the membranes do fail
and if it is more than a very small tear, the engine will stop. In fact, we
have just completed a shock-load inspection of a 52 engine whose membrane
failed; engine stopped and he did a wheels-up landing in a field!

Richard
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
--


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jill(at)m-14p.com
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PostPosted: Sun Mar 03, 2019 2:57 pm    Post subject: Carb discussion and canopy seal Reply with quote

Richard,

Could you provide us with the details of the membrane failure, symptoms of a problem prior to crash, etc. that would be beneficial to the group's knowledge and awareness. A picture of the failed membrane would be nice. Thank you!


Jill Gernetzke
M-14P, Inc.


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richard.goode(at)russiana
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PostPosted: Mon Mar 04, 2019 7:01 am    Post subject: Carb discussion and canopy seal Reply with quote

Certainly. The pilot was flying an aerobatic routine in France when he recounted (subsequently) that the engine missed and then recovered, but over about 10 minutes it became worse and worse and then finally the engine was hardly delivering any power at all, hence his doing an emergency forced-landing in a field, where the propeller hit the ground, hence causing the need for a shock-load inspection, which we have to do in Europe.

We sent the engine to Aerometal in Hungary, and I said to them that, from my experience, the issue sounded rather like a coil problem. However they dismantled the engine; no problems at all; reassembled it and then, as is our usual practice, put it on the dynamometer to test it. However it wouldn't start, and after a bit, Aerometal realised there was a carburettor problem; dismantled it; found a "tear" in the membrane; replaced it and the engine ran perfectly.

I have asked them if they can find the old membrane and give me a photograph of it. If I do get one, of course I will publish it.

But, I certainly know of another three membrane failures, typically causing excessive fuel in the engine and then partial engine failure. One was in a Yak 55 which was clearly running badly and so the pilot elected to return to his home airfield and then on finals to land he was coming a bit low; opened the throttle, and nothing happened so landed just outside the airfield, fortunately with no damage!

Richard


RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.


From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Jill Gernetzke
Sent: 03 March 2019 22:55
To: yak-list(at)matronics.com
Subject: RE: Carb discussion and canopy seal

Richard,

Could you provide us with the details of the membrane failure, symptoms of a problem prior to crash, etc. that would be beneficial to the group's knowledge and awareness. A picture of the failed membrane would be nice. Thank you!


Jill Gernetzke
M-14P, Inc.


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jay-dub



Joined: 31 May 2014
Posts: 87
Location: UK

PostPosted: Mon Mar 04, 2019 7:11 am    Post subject: Re: Carb discussion and canopy seal Reply with quote

Quote:

Certainly. The pilot was flying an aerobatic routine in France when he recounted (subsequently) that the engine missed and then recovered, but over about 10 minutes it became worse and worse and then finally the engine was hardly delivering any power at all, hence his doing an emergency forced-landing in a field, where the propeller hit the ground, hence causing the need for a shock-load inspection, which we have to do in Europe.


Substitute “UK” for “France” and the fact that I was able to deadstick it back in, that’s almost a carbon copy of my incident. Hopefully will get an answer next week when my partner and I open it up. [/quote]


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peter(at)scottbase.id.au
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PostPosted: Mon Mar 04, 2019 1:39 pm    Post subject: Carb discussion and canopy seal Reply with quote

Price for the canopy seal, please Jill? Or via separate email, I sent. Peter Scott
PLEASE NOTE MY NEW EMAIL ADDRESS is peter(at)scottbase.id.au (peter(at)scottbase.id.au)

Please use the new address in future communications.

On Mon, Mar 4, 2019 at 10:06 AM Jill Gernetzke <jill(at)m-14p.com (jill(at)m-14p.com)> wrote:

Quote:

Richard,
 
Could you provide us with the details of the membrane failure, symptoms of a problem prior to crash, etc. that would be beneficial to the group's knowledge and awareness.   A picture of the failed membrane would be nice.  Thank you! 
 
 
Jill Gernetzke
M-14P, Inc.
 



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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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motoadve



Joined: 23 Apr 2009
Posts: 93
Location: Seattle

PostPosted: Mon Mar 04, 2019 6:23 pm    Post subject: Re: Carb discussion and canopy seal Reply with quote

jill(at)m-14p.com wrote:
I have submitted the pix, but they are not posting for some reason. If you
want to view the pix, I will post on M-14P, inc. FB page.

Have a great weekend!

Jill

Group,

I am late to the discussion, but needed to clarify that an AK-14 diaphragm
can be utilized on the Huosai or AI-14 Carburetor (K-14). There are two
additional holes in the AK-14 diaphragm. These are of no consequence as it
is sealed between the two parts of the carburetor.

I do not have a Huosai carburetor apart, but I have attached photos of the
K-14 carburetor. The original carburetor diaphragm also has two additional
"blind holes" in a different location than the Ak-14 diaphragm, but
nonetheless, "holes to nowhere".

If there is still debate about why the Ak-14 diaphragm will not work, I
would like to hear the reason, as I am always open to learning.

The bigger issue, in my opinion, is people thinking that they can change out
a diaphragm and "fix" their carburetor. In all of the years that we have
been overhauling carburetors, we have only had 3 defective diaphragms.(None
resultant in a catastrophic failure.) It really is a testament to Russian
engineering. As Richard stated, the carburetors should be overhauled every
6 years, or so. There are numerous o-rings in the carburetor that go bad
with time and heat cycles. The butterfly shaft has 3 o-rings, alone. The
actuating assembly is in a lubricating bath of turbine oil. This area of the
carburetor is very close to #6 exhaust, so it is more common for these
o-rings to be a problem than a failing diaphragm. Sometimes, people mistake
leaking fluid from the bottom of the carburetor as fuel, but if they really
look and feel it, they may find it is turbine oil. The o-rings are no
longer doing their job on the butterfly shaft. The beauty of the Russian
design is that the o-rings serve as both a seal and a bearing surface, so
wear is minimal if the carburetors are overhauled at prescribed intervals.
Any use of Mo-Gas with ethanol will destroy the rubber bits in the
carburetor, fuel pump and even fuel hoses. Stay away from it.

Also, replying to the request this morning for Yak 52 canopy seals (leather)
- We stock them.
Jill Gernetzke
M-14P, Inc.


Do you overhaul carburators for the Housai engines also?


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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