Today's Message Index:
----------------------
1. 09:22 AM - Re: CJ-6 Tach Generator (Bitterlich, Mark G CIV NAVAIR, WD)
2. 12:19 PM - The tach drive location on the M-14p (Roger Kemp M.D.)
3. 12:21 PM - Tach drive (Roger Kemp M.D.)
4. 12:26 PM - Re: The tach drive location on the M-14p (George Coy)
5. 12:51 PM - Re: Tach drive (Bitterlich, Mark G CIV NAVAIR, WD)
6. 01:21 PM - 18T Paint Scheme Question (Robin Hou)
7. 06:03 PM - Re: Tach drive (Roger Kemp M.D.)
Message 1
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| Subject: | CJ-6 Tach Generator |
Doc, the M-14 Tach Generator in connected directly into the same
accessory drive gearing that also drives the air start distributor.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
M.D.
Sent: Saturday, May 25, 2013 11:27
Subject: Re: Yak-List: CJ-6 Tach Generator
--> <viperdoc@mindspring.com>
Interesting. On the M-14 it has its' own accessory drive port in front
of the octopus.
Doc
Sent from my iPad
On May 24, 2013, at 12:53 PM, "Gill Gutierrez" <gill.g@gpimail.com>
wrote:
>
> It's on top of the engine air start distributor. My experience was
> that there was a broken wire in the wiring harness cannon plug which
> was easily fixed.
>
> Gill
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of jdeuchar
> Sent: Friday, May 24, 2013 6:15 AM
> To: yak-list@matronics.com
> Subject: Yak-List: CJ-6 Tach Generator
>
> --> <f1rocket@unusualattitude.ca>
>
> Hi all, I have a 1984 Nanchang CJ-6 and my Tach-generator is acting
up.
> Does anyone know the location of this device on the airframe?
> Thanks,
> Jeff
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=401283#401283
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | The tach drive location on the M-14p |
While the Tach drive and the air start distributor share a spline drive insi
de the accessory case. They are not bolted to the same port on the accessory
case. It does sit anterior to the "octopus" though.
Doc
Sent from my iPad
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</b></font></pre></body></html>
Message 3
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For that matter, they all share a spline drive cog.
Doc
Sent from my iPad
<pre><b><font size=2 color="#000000" face="courier new,courier">
</b></font></pre></body></html>
Message 4
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| Subject: | The tach drive location on the M-14p |
And it has a different drive ratio.
George
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp M.D.
Sent: Tuesday, May 28, 2013 3:15 PM
Subject: Yak-List: The tach drive location on the M-14p
While the Tach drive and the air start distributor share a spline drive
inside the accessory case. They are not bolted to the same port on the
accessory case. It does sit anterior to the "octopus" though.
Doc
Message 5
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Yes Doc, and that is what I was trying to emphasize. Tell me exactly
which one of those spline cogs is attached to the Tach Drive! It's
important to know. The Tach Drive is not stand-alone, it is part of an
overall gear mechanism as your picture shows clearly. It does not
matter where the actual hole is on the case, what is important for the
average engine owner to understand is that the Tach Drive is part of the
whole accessory drive MECHANISM, and is a CRITICAL cog.
If you pull the Tach Drive Cover Plate clear out of the engine, you can
easily cause the Air Start Distributor to come out of time. This has
actually happened when some folks converted their Tach Drive systems
over to the P-1000 Tach by Horizon Instruments, that uses the Mag P-Lead
wire to determine engine RPM. They first pulled the Tach Drive itself
out, and then they decided to pull the next cover plate off in order to
make a blank off plate. Well, they went a tad bit too far in the "pull
and remove" phase, and managed to yank out the gear that goes with into
that mechanism you have a picture of, which allowed everything to come
out of time.
Give it a try and see what happens. :-) I would rather not. I saw it
happen after the fact, and had to re-time the Air Start Distributor for
the gent, which some folks claim is easy. I guess I am not as good as
they are, because for me it was a real task.
I am not an M-14 engine expert. Most of what I have learned has been
due to the mistakes made by myself and others. Some of those mistakes
have ruined entire engines, luckily not by me for the Grace of God! I
usually pass those lessons on via the Yak List. This is one of those
times.
Take care,
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
M.D.
Sent: Tuesday, May 28, 2013 15:19
Subject: Yak-List: Tach drive
For that matter, they all share a spline drive cog.
Doc
Message 6
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| Subject: | 18T Paint Scheme Question |
I noticed some 18T's have paint scheme that looked very similar to Beechcraft's
speedbird scheme. Does anyone know if there is a connection?
http://www.russianaeros.com/YAK18T-in%20flight.JPGhttp://upload.wikimedia.org/wikipedia/commons/5/52/YAK-18T_HA-YAB_1.JPGhttp://oleyeller.com/StaggerWing_FL01.JPGhttp://static.ddmcdn.com/gif/beech-staggerwing-1.jpghttp://upload.wikimedia.org/wikipedia/commons/5/51/Beech_G17S_Staggerwing_Chino.jpghttp://www.airbum.com/photos/Beech%20StaggerwingC-17L2.jpghttp://farm1.static.flickr.com/1/1209249_6b624762de.jpg
Message 7
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Mark,
Unfortunately I'm reading this after I have left the hanger. Tomorrow if I can
remember with all the crap going on in my life right now I will try to get you
a picture that shows exactly how the two interface in the accessory case. I
will try to find the shipping cover that came with my new engine. It like the
tach driver has a shaft that fits in the accessory port most likely to keep the
pinion gear from slipping into the accessory case.
If you look at that domed area behind the two splined gears that you see at an
angle , the gears that drive the octopus and the tach drive.
It has been a year since I had the thing apart. The memory has faded a little
on this.
Doc
Sent from my iPad
On May 28, 2013, at 2:48 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
wrote:
>
> Yes Doc, and that is what I was trying to emphasize. Tell me exactly
> which one of those spline cogs is attached to the Tach Drive! It's
> important to know. The Tach Drive is not stand-alone, it is part of an
> overall gear mechanism as your picture shows clearly. It does not
> matter where the actual hole is on the case, what is important for the
> average engine owner to understand is that the Tach Drive is part of the
> whole accessory drive MECHANISM, and is a CRITICAL cog.
>
> If you pull the Tach Drive Cover Plate clear out of the engine, you can
> easily cause the Air Start Distributor to come out of time. This has
> actually happened when some folks converted their Tach Drive systems
> over to the P-1000 Tach by Horizon Instruments, that uses the Mag P-Lead
> wire to determine engine RPM. They first pulled the Tach Drive itself
> out, and then they decided to pull the next cover plate off in order to
> make a blank off plate. Well, they went a tad bit too far in the "pull
> and remove" phase, and managed to yank out the gear that goes with into
> that mechanism you have a picture of, which allowed everything to come
> out of time.
>
> Give it a try and see what happens. :-) I would rather not. I saw it
> happen after the fact, and had to re-time the Air Start Distributor for
> the gent, which some folks claim is easy. I guess I am not as good as
> they are, because for me it was a real task.
>
> I am not an M-14 engine expert. Most of what I have learned has been
> due to the mistakes made by myself and others. Some of those mistakes
> have ruined entire engines, luckily not by me for the Grace of God! I
> usually pass those lessons on via the Yak List. This is one of those
> times.
>
> Take care,
>
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
> M.D.
> Sent: Tuesday, May 28, 2013 15:19
> To: yak-list@matronics.com
> Subject: Yak-List: Tach drive
>
> For that matter, they all share a spline drive cog.
> Doc
>
>
>
>
>
>
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