Today's Message Index:
----------------------
1. 05:01 AM - Re: Re: Chinese rebuild engine (Jill Gernetzke)
2. 05:46 AM - Re: Re: Re: Chinese rebuild engine (Bob Graves)
3. 05:51 AM - Re: Engine Stumble on Climb Out (JON BLAKE)
4. 06:49 AM - Re: Engine Stumble on Climb Out (A. Dennis Savarese)
5. 06:56 AM - Re: Engine Stumble on Climb Out (Roger Kemp)
6. 08:41 AM - Air Bottle Seal (Rico Jaeger)
7. 09:38 AM - Re: Chinese rebuild engine (Bitterlich, Mark G CIV NAVAIR, WD)
8. 09:49 AM - Re: Air Bottle Seal (Mark Pennington)
9. 10:07 AM - Re: Air Bottle Seal (JON BLAKE)
10. 11:30 AM - Re: Air Bottle Seal (Justin Drafts)
11. 12:54 PM - Re: Air Bottle Seal (Rico Jaeger)
12. 02:43 PM - CJ Mechanic needed (Craig Payne)
13. 03:42 PM - Re: Engine Stumble on Climb Out (Looigi)
14. 04:04 PM - Re: drunken attitude indicator in CJ (Ttail)
15. 04:38 PM - Re: Re: Engine Stumble on Climb Out (Frank Stelwagon)
16. 04:38 PM - Re: Re: Engine Stumble on Climb Out (A. Dennis Savarese)
17. 07:34 PM - Re: Re: Engine Stumble on Climb Out (Sam Sax)
18. 07:48 PM - Re: Re: Engine Stumble on Climb Out (Walter Lannon)
19. 08:04 PM - Re: Re: Engine Stumble on Climb Out (Roger Kemp)
Message 1
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| Subject: | Re: Re: Chinese rebuild engine |
Perhaps, the packing on the wobble pump or lack thereof, is causing you some
grief.
Was the engine test run at the factory? Mag timing is correct?
Just some thoughs/ideas.
Jill Gernetzke
M-14P, Inc.
4905 Flightline Drive
Kingman, AZ 86401
928-681-4400
www.m-14p.com
Message 2
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| Subject: | Re: Re: Chinese rebuild engine |
Thanks Jill. I replaced the wobble pump with new and it pumps fuel out at the
carb. I have not checked the timing on the mag. I should have paid more attention
to that part of the class when I was in Kingman.
GiddyUp,
Bob
On Jun 4, 2018, at 8:01 AM, Jill Gernetzke <jill@m-14p.com> wrote:
Perhaps, the packing on the wobble pump or lack thereof, is causing you some
grief.
Was the engine test run at the factory? Mag timing is correct?
Just some thoughs/ideas.
Jill Gernetzke
M-14P, Inc.
4905 Flightline Drive
Kingman, AZ 86401
928-681-4400
www.m-14p.com
Message 3
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| Subject: | Re: Engine Stumble on Climb Out |
Holy double props Sappman...
> On June 1, 2018 at 10:40 AM doug sapp <dougsappllc@gmail.com> wrote:
>
> Not exactly a Yak, but has a bit of Yak dna.
> https://www.auctionzip.com/auction-lot/lot_C5F405A9AF?utm_source=azemail&utm_medium=email&utm_campaign=alerts https://www.auctionzip.com/auction-lot/lot_C5F405A9AF?utm_source=azemail&utm_medium=email&utm_campaign=alerts
>
> On Wed, May 30, 2018 at 11:44 PM, ggtyler <ggtyler@gmail.com mailto:ggtyler@gmail.com > wrote:
>
Just a bit of excitement in the Yak 52TW today.
Flight before last the engine did a hard stumble twice in succession on climb out.
I immediately swung back towards the field, but once I pulled back from 2400RPM
to 2100, it smoothed out. Gave it a few minutes, played with the throttle
and rpm's and it did not come back. Figured it was just a fouled plug.
I did a couple more hours of flying and starts/stops that day with no issues.
Went up again today, and on climb out, 2400 RPM, hard stumble. Then another, and
another, quickly turned back, pulled back to 2100 RPM, but the hard stumbles
proceeded to keep happening. At one point, I was pretty sure it was going to
quit running entirely. That 1.5 seconds or 2 seconds of stumbles in a row can
feel like an eternity.
It was running pretty badly, wife was in the back on her second flight ever with
me. I was pretty darn stressed, so more focused on getting back on the ground
safely than anything else. I did not think to do a mag check, but didn't really
have time, as I had only just made pattern altitude by the time I was on
downwind. I did scan through all the instruments, and all temps/pressures seemed
be normal.
On final, I must say, I just wanted us to be back on the ground NOW, and was getting
in a bit of a hurry to get down. Realizing that stress was dictating my
landing, I just kept telling myself "don't get in a hurry, hold it off, hold it
off". Not my best landing ever, but not one I need to be ashamed of. I did find
it hard to keep my legs from bouncing all over while taxing. Not often I get
that much adrenaline pumping.
Wife's a bit of a gear-head so knew everything was definitely not cool, but she
stayed calm and didn't freak out. It's nice to have someone to hug after a bit
of a scare.
Dropped a text to Vladimir Yastremski (he does my annuals). That guy always calls
me back, no matter what time of day. He's even on vacation right now. Talk
about service! Diagnostics will come later, and will update here.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480530#480530 http://forums.matronics.com/viewtopic.php?p=480530#480530
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Message 4
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| Subject: | Re: Engine Stumble on Climb Out |
Could very well be the infamous magneto coil issue.
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 6/4/2018 8:51 AM, JON BLAKE wrote:
> Holy double props Sappman...
>
>> On June 1, 2018 at 10:40 AM doug sapp <dougsappllc@gmail.com> wrote:
>>
>> Not exactly a Yak, but has a bit of Yak dna.
>> https://www.auctionzip.com/auction-lot/lot_C5F405A9AF?utm_source=azemail&utm_medium=email&utm_campaign=alerts
>>
>> On Wed, May 30, 2018 at 11:44 PM, ggtyler <ggtyler@gmail.com
>> <mailto:ggtyler@gmail.com>> wrote:
>>
>> <mailto:ggtyler@gmail.com>>
>>
>> Just a bit of excitement in the Yak 52TW today.
>>
>> Flight before last the engine did a hard stumble twice in
>> succession on climb out. I immediately swung back towards the
>> field, but once I pulled back from 2400RPM to 2100, it smoothed
>> out. Gave it a few minutes, played with the throttle and rpm's
>> and it did not come back. Figured it was just a fouled plug.
>>
>> I did a couple more hours of flying and starts/stops that day
>> with no issues.
>>
>> Went up again today, and on climb out, 2400 RPM, hard stumble.
>> Then another, and another, quickly turned back, pulled back to
>> 2100 RPM, but the hard stumbles proceeded to keep happening. At
>> one point, I was pretty sure it was going to quit running
>> entirely. That 1.5 seconds or 2 seconds of stumbles in a row can
>> feel like an eternity.
>>
>> It was running pretty badly, wife was in the back on her second
>> flight ever with me. I was pretty darn stressed, so more focused
>> on getting back on the ground safely than anything else. I did
>> not think to do a mag check, but didn't really have time, as I
>> had only just made pattern altitude by the time I was on
>> downwind. I did scan through all the instruments, and all
>> temps/pressures seemed be normal.
>>
>> On final, I must say, I just wanted us to be back on the ground
>> NOW, and was getting in a bit of a hurry to get down. Realizing
>> that stress was dictating my landing, I just kept telling myself
>> "don't get in a hurry, hold it off, hold it off". Not my best
>> landing ever, but not one I need to be ashamed of. I did find it
>> hard to keep my legs from bouncing all over while taxing. Not
>> often I get that much adrenaline pumping.
>>
>> Wife's a bit of a gear-head so knew everything was definitely not
>> cool, but she stayed calm and didn't freak out. It's nice to have
>> someone to hug after a bit of a scare.
>>
>> Dropped a text to Vladimir Yastremski (he does my annuals). That
>> guy always calls me back, no matter what time of day. He's even
>> on vacation right now. Talk about service! Diagnostics will come
>> later, and will update here.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=480530#480530
>> <http://forums.matronics.com/viewtopic.php?p=480530#480530>
>>
>>
>>
>>
>>
>>
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>> target="_blank">http://www.matronics.com/Navigator?Yak-List
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>> -Matt Dralle, List Admin.
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>
Message 5
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| Subject: | Re: Engine Stumble on Climb Out |
Bad mag coil.
Doc
Sent from my iPad
> On Jun 4, 2018, at 7:51 AM, JON BLAKE <jblake207@comcast.net> wrote:
>
> Holy double props Sappman...
>
>> On June 1, 2018 at 10:40 AM doug sapp <dougsappllc@gmail.com> wrote:
>>
>> Not exactly a Yak, but has a bit of Yak dna.
>> https://www.auctionzip.com/auction-lot/lot_C5F405A9AF?utm_source=azemai
l&utm_medium=email&utm_campaign=alerts
>>
>>> On Wed, May 30, 2018 at 11:44 PM, ggtyler <ggtyler@gmail.com> wrote:
>>>
>>> Just a bit of excitement in the Yak 52TW today.
>>>
>>> Flight before last the engine did a hard stumble twice in succession on c
limb out. I immediately swung back towards the field, but once I pulled back
from 2400RPM to 2100, it smoothed out. Gave it a few minutes, played with t
he throttle and rpm's and it did not come back. Figured it was just a fouled
plug.
>>>
>>> I did a couple more hours of flying and starts/stops that day with no is
sues.
>>>
>>> Went up again today, and on climb out, 2400 RPM, hard stumble. Then anot
her, and another, quickly turned back, pulled back to 2100 RPM, but the hard
stumbles proceeded to keep happening. At one point, I was pretty sure it wa
s going to quit running entirely. That 1.5 seconds or 2 seconds of stumbles i
n a row can feel like an eternity.
>>>
>>> It was running pretty badly, wife was in the back on her second flight e
ver with me. I was pretty darn stressed, so more focused on getting back on t
he ground safely than anything else. I did not think to do a mag check, but d
idn't really have time, as I had only just made pattern altitude by the time
I was on downwind. I did scan through all the instruments, and all temps/p
ressures seemed be normal.
>>>
>>> On final, I must say, I just wanted us to be back on the ground NOW, and
was getting in a bit of a hurry to get down. Realizing that stress was dict
ating my landing, I just kept telling myself "don't get in a hurry, hold it o
ff, hold it off". Not my best landing ever, but not one I need to be ashamed
of. I did find it hard to keep my legs from bouncing all over while taxing.
Not often I get that much adrenaline pumping.
>>>
>>> Wife's a bit of a gear-head so knew everything was definitely not cool, b
ut she stayed calm and didn't freak out. It's nice to have someone to hug af
ter a bit of a scare.
>>>
>>> Dropped a text to Vladimir Yastremski (he does my annuals). That guy alw
ays calls me back, no matter what time of day. He's even on vacation right n
ow. Talk about service! Diagnostics will come later, and will update here.
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=480530#480530
>>>
>>>
>>>
>>>
>>>
>>>
>>> ========================
===========
>>> List" rel="noreferrer" target="_blank">http://www.matronics.com/Navi
gator?Yak-List
>>> ========================
===========
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>>> eferrer" target="_blank">http://forums.matronics.com
>>> ========================
===========
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>>> errer" target="_blank">http://wiki.matronics.com
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===========
>>> b Site -
>>> -Matt Dralle, List Admin.
>>> rel="noreferrer" target="_blank">http://www.matronics.com/contributi
on
>>> ========================
===========
>>>
>>>
>>>
>>
>
>
Message 6
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Does anyone have the hot tip for sealing air bottles? In pulling 3 apart, I
've found nylon seals, neoprene o-rings, gasket sealer, etc. The parts manu
al shows a nut, a washer and a "sealnig" (sic) ring. Is the washer a crush
washer? My emergency bottle fills to about half capacity - then hisses unti
l empty. I've been through the whole system and just replaced the bottle, b
ut now am having redundant issues trying to seal it.
HELP!
Thanks!
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 //
Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
Message 7
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| Subject: | Re: Chinese rebuild engine |
Out on the fringe ... but have you ever run a compression check on this engine?
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Flibob
Sent: Saturday, June 02, 2018 5:12 PM
Subject: [Non-DoD Source] Yak-List: Re: Chinese rebuild engine
Still working on this engine. Starts but won't run unless 1. Throttle is pumped
constantly or 2 wobble is pumped or 3 primer is pumped. Any of which will keep
engine running at 1500 +_.
I have taken the carberater and fuel pump off running engine with no effect. Also
cleaned points in both mags.
Any ideas?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480590#480590
Message 8
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| Subject: | Re: Air Bottle Seal |
Rico
I just went through this with my CJ. Replaced the main and emergency air
tanks with new stainless steel tanks. The seals I got from Doug were
stainless steel threaded plugs / fittings with copper crush washers.
After three attempts to seal the inlet and outlet fittings I call Doug and
he told me to use use the black gooey thread sealant sparingly on the
threads.
Once I did that and let the tanks sit over night I was successful in
sealing the tanks on both the inlet fittings and the drain plug. 20 hours
later still holding tight.
The sealant I used was obtained from O'Reilys Auto Parts and is for
aviation use. The product used is
VersaChem Prime Seal Type 3 for aviation VersaChem Part Number is 34000
Hope this helps
Mark
N621CJ
Richmond VA
On Mon, Jun 4, 2018 at 11:40 AM, Rico Jaeger <rocknpilot@hotmail.com> wrote:
> Does anyone have the hot tip for sealing air bottles? In pulling 3 apart,
> I've found nylon seals, neoprene o-rings, gasket sealer, etc. The parts
> manual shows a nut, a washer and a "sealnig" (sic) ring. Is the washer a
> crush washer? My emergency bottle fills to about half capacity - then
> hisses until empty. I've been through the whole system and just replaced
> the bottle, but now am having redundant issues trying to seal it.
>
>
> HELP!
>
>
> Thanks!
>
>
> Rico Jaeger
> 915 S. 11th Ave.
> <https://maps.google.com/?q=915+S.+11th+Ave.++%0D%0AWausau,+WI.+54401++%0D%0A715&entry=gmail&source=g>
>
> Wausau, WI. 54401
> 715.529.7426
> //
> 1969 Cessna 150J ^/---//-X
> N61333 //
> Hangar #35 / AUW
> //
> 1992 Yakovlev Yak 52 ^/---//-X
> N21YK //
> Hangar #21 / AUW
>
>
Message 9
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| Subject: | Re: Air Bottle Seal |
Doug Sapp sells the brass crush washer needed. JB
> On June 4, 2018 at 10:40 AM Rico Jaeger <rocknpilot@hotmail.com> wrote:
>
> Does anyone have the hot tip for sealing air bottles? In pulling 3 apart,
I've found nylon seals, neoprene o-rings, gasket sealer, etc. The parts manual
shows a nut, a washer and a "sealnig" (sic) ring. Is the washer a crush washer?
My emergency bottle fills to about half capacity - then hisses until empty.
I've been through the whole system and just replaced the bottle, but now am
having redundant issues trying to seal it.
>
> HELP!
>
> Thanks!
>
> Rico Jaeger
> 915 S. 11th Ave.
> Wausau, WI. 54401
> 715.529.7426
> //
> 1969 Cessna 150J ^/---//-X
> N61333 //
> Hangar #35 / AUW
> //
> 1992 Yakovlev Yak 52 ^/---//-X
> N21YK //
> Hangar #21 / AUW
>
>
>
Message 10
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| Subject: | Re: Air Bottle Seal |
Hey hey, so I JUST encountered the identical issue on my CJ6's emergency
and main air bottles during cond insp.
I pulled the drain plugs to clean the bottles, removing non-standard lead
crush washers from in the process. (They'd been there since purchase,
perhaps installed by Chinese?)
After cleaning/rinsing bottles I reinstalled the plugs with PLAAF-specified
copper washers.
The main bottle holds air perfectly on first try.
The emergency bottle flatly refused to hold air despite several attempts
with new Cu washers... very slow leaks remained.
I finally cleaned everything with compressed air & Isopropyl alcohol,
applied a high-pressure (5000 psi) PermaTex thread sealer to the drain plug
threads, reinstalled w/ new Cu washer otherwise per Chinese parts manual.
Once the sealant had fully set (24 hrs), it holds air 100%.
Worked for me!
Justin Drafts
N280NC
On 11:46, Mon, Jun 4, 2018 Rico Jaeger <rocknpilot@hotmail.com> wrote:
> Does anyone have the hot tip for sealing air bottles? In pulling 3 apart,
> I've found nylon seals, neoprene o-rings, gasket sealer, etc. The parts
> manual shows a nut, a washer and a "sealnig" (sic) ring. Is the washer a
> crush washer? My emergency bottle fills to about half capacity - then
> hisses until empty. I've been through the whole system and just replaced
> the bottle, but now am having redundant issues trying to seal it.
>
>
> HELP!
>
>
> Thanks!
>
>
> Rico Jaeger
> 915 S. 11th Ave.
> Wausau, WI. 54401
> 715.529.7426
> //
> 1969 Cessna 150J ^/---//-X
> N61333 //
> Hangar #35 / AUW
> //
> 1992 Yakovlev Yak 52 ^/---//-X
> N21YK //
> Hangar #21 / AUW
>
>
Message 11
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| Subject: | Re: Air Bottle Seal |
Thanks, Justin!! I will give it a try...
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 //
Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
________________________________
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.
com> on behalf of Justin Drafts <draftsjust417@gmail.com>
Sent: Monday, June 4, 2018 1:25:17 PM
Subject: Re: Yak-List: Air Bottle Seal
Hey hey, so I JUST encountered the identical issue on my CJ6's emergency an
d main air bottles during cond insp.
I pulled the drain plugs to clean the bottles, removing non-standard lead c
rush washers from in the process. (They'd been there since purchase, perhap
s installed by Chinese?)
After cleaning/rinsing bottles I reinstalled the plugs with PLAAF-specified
copper washers.
The main bottle holds air perfectly on first try.
The emergency bottle flatly refused to hold air despite several attempts wi
th new Cu washers... very slow leaks remained.
I finally cleaned everything with compressed air & Isopropyl alcohol, appli
ed a high-pressure (5000 psi) PermaTex thread sealer to the drain plug thre
ads, reinstalled w/ new Cu washer otherwise per Chinese parts manual. Once
the sealant had fully set (24 hrs), it holds air 100%.
Worked for me!
Justin Drafts
N280NC
On 11:46, Mon, Jun 4, 2018 Rico Jaeger <rocknpilot@hotmail.com<mailto:rockn
pilot@hotmail.com>> wrote:
Does anyone have the hot tip for sealing air bottles? In pulling 3 apart, I
've found nylon seals, neoprene o-rings, gasket sealer, etc. The parts manu
al shows a nut, a washer and a "sealnig" (sic) ring. Is the washer a crush
washer? My emergency bottle fills to about half capacity - then hisses unti
l empty. I've been through the whole system and just replaced the bottle, b
ut now am having redundant issues trying to seal it.
HELP!
Thanks!
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 //
Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
Message 12
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| Subject: | CJ Mechanic needed |
A prospective CJ customer of mine will base near Gulfport, MS and will need
help from time-to-time, between annuals for a local mechanic with Yak/CJ
experience. Any such guys around that area?
Craig Payne
Payne Aviation LLC
Message 13
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| Subject: | Re: Engine Stumble on Climb Out |
So, I pulled the plus on my Yak-52 today as a part of the Annual check and measured
the resistance through the core (plug lead contact to electrode). I found
a varied set of resistance values ranging from 1500 ohms (perfect) through 5000
ohms (the accepted limit) to 15 000 ohms (way outside tolerance).
I have replaced one magneto coil and two starter booster coils on my plane in 70
hours! I doubt that these parts are the root cause. My suspicion is that the
high resistance plugs are causing the issues we are seeing. I think what is
happening is that the spark energy is cross firing inside the harness to a cylinder
that is on it's induction stroke rather than go through the high resistance
plugs like a well behaved spark should. The rogue spark energy could also
me damaging the capacitor in the coil as well, like Richard suggests.
I have asked before, but I have not had any replies... What are the resistance
of your plugs? I'll bet that you have a few high resistance plugs in amongst
yours.
We are going to be fitting Dennis's automotive kit to our Yak to hopefully resolve
this issue.
There is some serious Yak and CJ-6 experience on here... Thoughts?
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480649#480649
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| Subject: | Re: drunken attitude indicator in CJ |
Single unit with internal Gyro.I put a new one in about 2 years ago. Straight out
straight in worked flawlessly.
I received the new AI in a pressurized tin ... it was an almost zen experience
opening the can :)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480650#480650
Message 15
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| Subject: | Re: Engine Stumble on Climb Out |
Go with Denniss kit by all means.
Frank
Sent from my iPhone
> On Jun 4, 2018, at 3:41 PM, Looigi <cdoburton@gmail.com> wrote:
>
>
> So, I pulled the plus on my Yak-52 today as a part of the Annual check and measured
the resistance through the core (plug lead contact to electrode). I found
a varied set of resistance values ranging from 1500 ohms (perfect) through
5000 ohms (the accepted limit) to 15 000 ohms (way outside tolerance).
>
> I have replaced one magneto coil and two starter booster coils on my plane in
70 hours! I doubt that these parts are the root cause. My suspicion is that
the high resistance plugs are causing the issues we are seeing. I think what
is happening is that the spark energy is cross firing inside the harness to a
cylinder that is on it's induction stroke rather than go through the high resistance
plugs like a well behaved spark should. The rogue spark energy could
also me damaging the capacitor in the coil as well, like Richard suggests.
>
> I have asked before, but I have not had any replies... What are the resistance
of your plugs? I'll bet that you have a few high resistance plugs in amongst
yours.
>
> We are going to be fitting Dennis's automotive kit to our Yak to hopefully resolve
this issue.
>
> There is some serious Yak and CJ-6 experience on here... Thoughts?
>
> Chris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480649#480649
>
>
>
>
>
>
>
>
>
Message 16
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| Subject: | Re: Engine Stumble on Climb Out |
As far as the stumble you experienced, although you replaced one coil alrea
dy, don't discount the fact that the other mag coil could also be failing i
ntermittently.=C2-
There is another very important issue that many, many people do not look in
to.=C2- It is much like setting the E gap on a Bendix or Slick magneto us
ed on a Lycoming or Continental engine.=C2- All of the Russian and Chines
e mags have the same issue and that is, there is no E-gap setting.=C2- Th
e E-gap setting on the Bendix or Slick magnetos sets the point gap AND alig
ns the rotor finger with the contact point in the distributor cap.
Most everyone understands that the point gap has to be set to .25-.35mm or
.010-.014 thousands.=C2- Ideally, .3 mm or .012. =C2- But again, settin
g the point gap does not align the rotor to the contact point to the distri
butor cap on the Russian and Chinese mags.=C2- And that is where so many
people setting the timing on the Russian and Chinese mags fall short.=C2-
It is imperative after setting the point gap and the timing that the rotor
be properly positioned when the points first open on the number 4 cylinder
, to align directly under the distributor contact point.=C2- That is why
there are 3 slots in the rotor with screws so the screws can be loosened an
d the leading finger in the counterclockwise rotation points directly to th
e scribe mark on the flat surface mating with the cover and next to the hig
h voltage stick.=C2- Loosen the 3 screws and with a 6" metal ruler or str
aight edge, align the straight edge with the center of the rotor, the leadi
ng finger in the counterclockwise rotation direction AND the scribe mark.
=C2- Be sure to look directly down on the magneto.=C2- Not on an angle
because the alignment will not be directly under the contact point when the
distributor cap is reinstalled.=C2- Once you do this, you will have esse
ntially set the "E-gap" and eliminate any potential arcing between the roto
r finger and the contact in the cap.=C2- Remember, ANY air gap adds resis
tance to the circuit and thus reduces the electrical charge to the plug.=C2
- That is why positioning the rotor after setting the point gap and then
the mag timing is so important.Dennis
From: Looigi <cdoburton@gmail.com>
To: yak-list@matronics.com
Sent: Monday, June 4, 2018 6:44 PM
Subject: Yak-List: Re: Engine Stumble on Climb Out
So, I pulled the plus on my Yak-52 today as a part of the Annual check and
measured the resistance through the core (plug lead contact to electrode).
=C2- I found a varied set of resistance values ranging from 1500 ohms (pe
rfect) through 5000 ohms (the accepted limit) to 15 000 ohms (way outside t
olerance).
I have replaced one magneto coil and two starter booster coils on my plane
in 70 hours!=C2- I doubt that these parts are the root cause.=C2- My su
spicion is that the high resistance plugs are causing the issues we are see
ing.=C2- I think what is happening is that the spark energy is cross firi
ng inside the harness to a cylinder that is on it's induction stroke rather
than go through the high resistance plugs like a well behaved spark should
.=C2- The rogue spark energy could also me damaging the capacitor in the
coil as well, like Richard suggests.
I have asked before, but I have not had any replies...=C2- What are the r
esistance of your plugs?=C2- I'll bet that you have a few high resistance
plugs in amongst yours.
We are going to be fitting Dennis's automotive kit to our Yak to hopefully
resolve this issue.
There is some serious Yak and CJ-6 experience on here...=C2- Thoughts?
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480649#480649
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 17
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| Subject: | Re: Engine Stumble on Climb Out |
Dennis,
An excellent point and very well explained! =93 a good refresher
for many of us, myself included
Thanks much,
Sam Sax
Miami
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Monday, June 04, 2018 7:38 PM
Subject: Re: Yak-List: Re: Engine Stumble on Climb Out
As far as the stumble you experienced, although you replaced one coil
already, don't discount the fact that the other mag coil could also be
failing intermittently.
There is another very important issue that many, many people do not look
into. It is much like setting the E gap on a Bendix or Slick magneto
used on a Lycoming or Continental engine. All of the Russian and
Chinese mags have the same issue and that is, there is no E-gap setting.
The E-gap setting on the Bendix or Slick magnetos sets the point gap
AND aligns the rotor finger with the contact point in the distributor
cap.
Most everyone understands that the point gap has to be set to .25-.35mm
or .010-.014 thousands. Ideally, .3 mm or .012. But again, setting
the point gap does not align the rotor to the contact point to the
distributor cap on the Russian and Chinese mags. And that is where so
many people setting the timing on the Russian and Chinese mags fall
short. It is imperative after setting the point gap and the timing that
the rotor be properly positioned when the points first open on the
number 4 cylinder, to align directly under the distributor contact
point. That is why there are 3 slots in the rotor with screws so the
screws can be loosened and the leading finger in the counterclockwise
rotation points directly to the scribe mark on the flat surface mating
with the cover and next to the high voltage stick. Loosen the 3 screws
and with a 6" metal ruler or straight edge, align the straight edge with
the center of the rotor, the leading finger in the counterclockwise
rotation direction AND the scribe mark. Be sure to look directly down
on the magneto. Not on an angle because the alignment will not be
directly under the contact point when the distributor cap is
reinstalled. Once you do this, you will have essentially set the
"E-gap" and eliminate any potential arcing between the rotor finger and
the contact in the cap. Remember, ANY air gap adds resistance to the
circuit and thus reduces the electrical charge to the plug. That is why
positioning the rotor after setting the point gap and then the mag
timing is so important.
Dennis
_____
From: Looigi <cdoburton@gmail.com>
Sent: Monday, June 4, 2018 6:44 PM
Subject: Yak-List: Re: Engine Stumble on Climb Out
So, I pulled the plus on my Yak-52 today as a part of the Annual check
and measured the resistance through the core (plug lead contact to
electrode). I found a varied set of resistance values ranging from 1500
ohms (perfect) through 5000 ohms (the accepted limit) to 15 000 ohms
(way outside tolerance).
I have replaced one magneto coil and two starter booster coils on my
plane in 70 hours! I doubt that these parts are the root cause. My
suspicion is that the high resistance plugs are causing the issues we
are seeing. I think what is happening is that the spark energy is cross
firing inside the harness to a cylinder that is on it's induction stroke
rather than go through the high resistance plugs like a well behaved
spark should. The rogue spark energy could also me damaging the
capacitor in the coil as well, like Richard suggests.
I have asked before, but I have not had any replies... What are the
resistance of your plugs? I'll bet that you have a few high resistance
plugs in amongst yours.
We are going to be fitting Dennis's automotive kit to our Yak to
hopefully resolve this issue.
There is some serious Yak and CJ-6 experience on here... Thoughts?
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480649#480649
http://www.matronics.nbsp; - MATRONICS WEB FORUMS -htt=
<http://forums.matronics.com/> - NEW MATRONICS LIST
WIiki.matronics.com/" target="_blank">http://wiki.matronics.com
http://www.matron==
Message 18
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| Subject: | Re: Engine Stumble on Climb Out |
I have been checking aircraft spark plug resistance for a few years now.
My score so far: Champion -- Terrible, Tempest -- Very good, Chinese DZ
5 -- The best, typically 1200 -1500. Don't recall ever replacing one for
this reason. Have not, so far, checked any Russian ones.
Walt
-----Original Message-----
From: Looigi
Sent: Monday, June 04, 2018 3:41 PM
Subject: Yak-List: Re: Engine Stumble on Climb Out
So, I pulled the plus on my Yak-52 today as a part of the Annual check and
measured the resistance through the core (plug lead contact to electrode).
I found a varied set of resistance values ranging from 1500 ohms (perfect)
through 5000 ohms (the accepted limit) to 15 000 ohms (way outside
tolerance).
I have replaced one magneto coil and two starter booster coils on my plane
in 70 hours! I doubt that these parts are the root cause. My suspicion is
that the high resistance plugs are causing the issues we are seeing. I
think what is happening is that the spark energy is cross firing inside the
harness to a cylinder that is on it's induction stroke rather than go
through the high resistance plugs like a well behaved spark should. The
rogue spark energy could also me damaging the capacitor in the coil as well,
like Richard suggests.
I have asked before, but I have not had any replies... What are the
resistance of your plugs? I'll bet that you have a few high resistance
plugs in amongst yours.
We are going to be fitting Dennis's automotive kit to our Yak to hopefully
resolve this issue.
There is some serious Yak and CJ-6 experience on here... Thoughts?
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480649#480649
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Message 19
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| Subject: | Re: Engine Stumble on Climb Out |
My limited experience with the Chinese DZ5 plugs is the are hotter.
Doc
Sent from my iPad
> On Jun 4, 2018, at 9:48 PM, Walter Lannon <wlannon@shaw.ca> wrote:
>
>
> I have been checking aircraft spark plug resistance for a few years now.
>
> My score so far: Champion -- Terrible, Tempest -- Very good, Chinese DZ 5
-- The best, typically 1200 -1500. Don't recall ever replacing one for this reason.
Have not, so far, checked any Russian ones.
>
> Walt
>
> -----Original Message----- From: Looigi
> Sent: Monday, June 04, 2018 3:41 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Engine Stumble on Climb Out
>
>
> So, I pulled the plus on my Yak-52 today as a part of the Annual check and measured
the resistance through the core (plug lead contact to electrode). I found
a varied set of resistance values ranging from 1500 ohms (perfect) through
5000 ohms (the accepted limit) to 15 000 ohms (way outside tolerance).
>
> I have replaced one magneto coil and two starter booster coils on my plane in
70 hours! I doubt that these parts are the root cause. My suspicion is that
the high resistance plugs are causing the issues we are seeing. I think what
is happening is that the spark energy is cross firing inside the harness to a
cylinder that is on it's induction stroke rather than go through the high resistance
plugs like a well behaved spark should. The rogue spark energy could
also me damaging the capacitor in the coil as well, like Richard suggests.
>
> I have asked before, but I have not had any replies... What are the resistance
of your plugs? I'll bet that you have a few high resistance plugs in amongst
yours.
>
> We are going to be fitting Dennis's automotive kit to our Yak to hopefully resolve
this issue.
>
> There is some serious Yak and CJ-6 experience on here... Thoughts?
>
> Chris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=480649#480649
>
>
>
>
>
>
>
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
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