 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
|
 Posted: Fri May 26, 2017 7:26 pm Post subject: One the hunt for one pesky gremlin |
 |
|
Did you pull the fenestrated fuel filter in the carburetor throat. Fragments of the inner lining of the fuel line can break off and block fuel flow threw the carb. That caused an engine stoppage at 50ft AGL on TO in my 50. The engine did very similar but nothing could be found.
Doc
Sent from my iPad
| Quote: | On May 26, 2017, at 6:22 PM, Gazoo <stefancorriveau(at)hotmail.com> wrote:
Well, my Yak season is off to a very slow start due to a phantom gremlin stuck inside my airplane.
1st start and attempted run-up
My first start of the season was a difficult one which required much coaxing but resulted in success after numerous attempts and nitrogen bottles. The first run-up was conducted with cowlings off to check for oil leaks following a compressor change-out. Given the ambient temperature at the time and no cowls, it took approximately fifteen minutes to come up to temperature.
The engine ran smoothly during the warm up at 40% except ran rough once about midway thru for about five seconds but then ran smooth once again after momentarily changing power setting.
Just as oil temp was approaching 40°C and CHT 140°C, the idle started to “hunt” between 40% and 35%. I glanced quickly at the fuel pressure and it was holding at 0.4. After three rapid increases and decreases in RPM, the engine just smoothly quit.
No restart was attempted because at first we suspected fuel blockage so a tear down of the fuel system was completed to find the issue, however, no anomalies were found. The fuel system was checked over during the annual and all fuel screens, which were clean, were checked at that time, however, we checked them again. All were clean and in good condition.
2nd start and run-up
After putting the airplane back together, engine started no problem this time and ran beautifully smooth for the entire warm-up and run-up. All engine parameters were normal. Engine was run for approximately 20 mins.
3rd start and run-up
Same story as the second, engine started no problem and ran beautifully smooth for the entire warm-up and run-up. All engine parameters normal. Engine was run for approximately 20 mins. Only anomaly found was a broken line from the compressor to the snot valve.
At this point, whatever clean-up and recheck of the fuel system we had done was leading us to believe that the issue may have been a one-time event, but with no hard and fast culprit in custody, we were suspicious that the problem was not corrected so more run-ups were in order.
4th start and attempted run-up
Engine started beautifully on very little prime and ran smoothly. It took about five minutes to get up to temp and just as oil temp was approaching 40°C and CHT 140°C, then engine again just smoothly quit despite adding throttle to compensate for the dropping RPM. Fuel pressure held steady at 0.4 throughout.
A few phone calls were made and we were advised to check for blockage in the fuel vents. These were checked and flushed these with compressed air.
5th start and attempted run-up
After flushing the fuel vents, we started up again. Smooth start and run but within the same timeframe and temps, the engine just smoothly quit. Fuel pressure again held steady at 0.4 throughout.
6th start and run-up
This time we elected to try another restart immediately so with only one shot of prime to the cylinder side, the engine again started right up and ran beautifully and continued to do so through the entire run-up. We ran it for 20 mins with no anomalies.
We are now officially, totally at a loss as to what could be the cause.
--------
Stefan Corriveau
stefancorriveau(at)hotmail.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469626#469626
|
| | - The Matronics Yak-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Yak-List |
|
_________________
Viperdoc |
|
| Back to top |
|
 |
Ernie
Joined: 11 Jan 2006
Posts: 513
|
| Posted: Fri May 26, 2017 7:37 pm Post subject: One the hunt for one pesky gremlin |
|
|
I once had my fenestrated pulled. Eventually led to getting my prostrate
removed.
On Fri, May 26, 2017 at 11:29 PM Roger Kemp <f16viperdoc(at)me.com> wrote:
[quote]
Did you pull the fenestrated fuel filter in the carburetor throat.
Fragments of the inner lining of the fuel line can break off and block fuel
flow threw the carb. That caused an engine stoppage at 50ft AGL on TO in
my 50. The engine did very similar but nothing could be found.
Doc
Sent from my iPad
> On May 26, 2017, at 6:22 PM, Gazoo <stefancorriveau(at)hotmail.com> wrote:
>
>
>
> Well, my Yak season is off to a very slow start due to a phantom gremlin
stuck inside my airplane.
>
> 1st start and attempted run-up
>
> My first start of the season was a difficult one which required much
coaxing but resulted in success after numerous attempts and nitrogen
bottles. The first run-up was conducted with cowlings off to check for oil
leaks following a compressor change-out. Given the ambient temperature at
the time and no cowls, it took approximately fifteen minutes to come up to
temperature.
>
> The engine ran smoothly during the warm up at 40% except ran rough once
about midway thru for about five seconds but then ran smooth once again
after momentarily changing power setting.
>
> Just as oil temp was approaching 40°C and CHT 140°C, the idle started to
“hunt” between 40% and 35%. I glanced quickly at the fuel pressure and it
was holding at 0.4. After three rapid increases and decreases in RPM, the
engine just smoothly quit.
>
> No restart was attempted because at first we suspected fuel blockage so
a tear down of the fuel system was completed to find the issue, however, no
anomalies were found. The fuel system was checked over during the annual
and all fuel screens, which were clean, were checked at that time, however,
we checked them again. All were clean and in good condition.
>
> 2nd start and run-up
>
> After putting the airplane back together, engine started no problem this
time and ran beautifully smooth for the entire warm-up and run-up. All
engine parameters were normal. Engine was run for approximately 20 mins.
>
> 3rd start and run-up
>
> Same story as the second, engine started no problem and ran beautifully
smooth for the entire warm-up and run-up. All engine parameters normal.
Engine was run for approximately 20 mins. Only anomaly found was a broken
line from the compressor to the snot valve.
>
> At this point, whatever clean-up and recheck of the fuel system we had
done was leading us to believe that the issue may have been a one-time
event, but with no hard and fast culprit in custody, we were suspicious
that the problem was not corrected so more run-ups were in order.
>
> 4th start and attempted run-up
>
> Engine started beautifully on very little prime and ran smoothly. It
took about five minutes to get up to temp and just as oil temp was
approaching 40°C and CHT 140°C, then engine again just smoothly quit
despite adding throttle to compensate for the dropping RPM. Fuel pressure
held steady at 0.4 throughout.
>
> A few phone calls were made and we were advised to check for blockage in
the fuel vents. These were checked and flushed these with compressed air
| | - The Matronics Yak-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Yak-List |
|
|
|
| Back to top |
|
|
Dawg
Joined: 19 May 2013
Posts: 355
|
| Posted: Fri May 26, 2017 8:06 pm Post subject: One the hunt for one pesky gremlin |
|
|
we had twins!
| Quote: | On May 26, 2017, at 21:35, Ernest Martinez <erniel29(at)gmail.com (erniel29(at)gmail.com)> wrote:
I once had my fenestrated pulled. Eventually led to getting my prostrate removed.
On Fri, May 26, 2017 at 11:29 PM Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> wrote:
| Quote: | | --> Yak-List message posted by: Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> Did you pull the fenestrated fuel filter in the carburetor throat. Fragments of the inner lining of the fuel line can break off and block fuel flow threw the carb. That caused an engine stoppage at 50ft AGL on TO in my 50. The engine did very similar but nothing could be found. Doc Sent from my iPad > On May 26, 2017, at 6:22 PM, Gazoo <stefancorriveau(at)hotmail.com (stefancorriveau(at)hotmail.com)> wrote: > > --> Yak-List message posted by: "Gazoo" <stefancorriveau(at)hotmail.com (stefancorriveau(at)hotmail.com)> > > Well, my Yak season is off to a very slow start due to a phantom gremlin stuck inside my airplane. > > 1st start and attempted run-up > > My first start of the season was a difficult one which required much coaxing but resulted in success after numerous attempts and nitrogen bottles. The first run-up was conducted with cowlings off to check for oil leaks following a compressor change-out. Given the ambient temperature at the time and no cowls, it took approximately fifteen minutes to come up to temperature. > > The engine ran smoothly during the warm up at 40% except ran rough once about midway thru for about five seconds but then ran smooth once again after momentarily changing power setting. > > Just as oil temp was approaching 40°C and CHT 140°C, the idle started to “hunt” between 40% and 35%. I glanced quickly at the fuel pressure and it was holding at 0.4. After three rapid increases and decreases in RPM, the engine just smoothly quit. > > No restart was attempted because at first we suspected fuel blockage so a tear down of the fuel system was completed to find the issue, however, no anomalies were found. The fuel system was checked over during the annual and all fuel screens, which were clean, were checked at that time, however, we checked them again. All were clean and in good condition. > > 2nd start and run-up > > After putting the airplane back together, engine started no problem this time and ran beautifully smooth for the entire warm-up and run-up. All engine parameters were normal. Engine was run for approximately 20 mins. > > 3rd start and run-up > > Same story as the second, engine started no problem and ran beautifully smooth for the entire warm-up and run-up. All engine parameters normal. Engine was run for approximately 20 mins. Only anomaly found was a broken line from the compressor to the snot valve. > > At this point, whatever clean-up and recheck of the fuel system we had done was leading us to believe that the issue may have been a one-time event, but with no hard and fast culprit in custody, we were suspicious that the problem was not corrected so more run-ups were in order. > > 4th start and attempted run-up > > Engine started beautifully on very little prime and ran smoothly. It took about five minutes to get up to temp and just as oil temp was approaching 40°C and CHT 140°C, then engine again just smoothly quit despite adding throttle to compensate for the dropping RPM. Fuel pressure held steady at 0.4 throughout. > > A few phone calls were made and we were advised to check for blockage in the fuel vents. These were checked and flushed these with compressed air. > > 5th start and attempted run-up > > After flushing the fuel vents, we started up again. Smooth start and run but within the same timeframe and temps, the engine just smoothly quit. Fuel pressure again held steady at 0.4 throughout. > > 6th start and run-up > > This time we elected to try another restart immediately so with only one shot of prime to the cylinder side, the engine again started right up and ran beautifully and continued to do so through the entire run-up. We ran it for 20 mins with no anomalies. > > We are now officially, totally at a loss as to what could be the cause. > > -------- > Stefan Corriveau > stefancorriveau(at)hotmail.com (stefancorriveau(at)hotmail.com) > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=469626#469626 > > > > > > > > > =========== List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Yak-List =========== FORUMS - eferrer" target="_blank">http://forums.matronics.com =========== WIKI - errer" target="_blank">http://wiki.matronics.com =========== b Site - -Matt Dralle, List Admin. rel="noreferrer" target="_blank">http://www.matronics.com/contribution =========== |
|
| | - The Matronics Yak-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Yak-List |
|
_________________
Dawg |
|
| Back to top |
|
|
rickkelleyfly(at)gmail.co
Guest
|
| Posted: Sat May 27, 2017 12:05 am Post subject: One the hunt for one pesky gremlin |
|
|
Check end play of the shaft on the carburetor
Thug
Sent from my iPhone
| Quote: | On May 26, 2017, at 11:23 PM, Roger Kemp <f16viperdoc(at)me.com> wrote:
Did you pull the fenestrated fuel filter in the carburetor throat. Fragments of the inner lining of the fuel line can break off and block fuel flow threw the carb. That caused an engine stoppage at 50ft AGL on TO in my 50. The engine did very similar but nothing could be found.
Doc
Sent from my iPad
> On May 26, 2017, at 6:22 PM, Gazoo <stefancorriveau(at)hotmail.com> wrote:
>
>
>
> Well, my Yak season is off to a very slow start due to a phantom gremlin stuck inside my airplane.
>
> 1st start and attempted run-up
>
> My first start of the season was a difficult one which required much coaxing but resulted in success after numerous attempts and nitrogen bottles. The first run-up was conducted with cowlings off to check for oil leaks following a compressor change-out. Given the ambient temperature at the time and no cowls, it took approximately fifteen minutes to come up to temperature.
>
> The engine ran smoothly during the warm up at 40% except ran rough once about midway thru for about five seconds but then ran smooth once again after momentarily changing power setting.
>
> Just as oil temp was approaching 40°C and CHT 140°C, the idle started to “hunt” between 40% and 35%. I glanced quickly at the fuel pressure and it was holding at 0.4. After three rapid increases and decreases in RPM, the engine just smoothly quit.
>
> No restart was attempted because at first we suspected fuel blockage so a tear down of the fuel system was completed to find the issue, however, no anomalies were found. The fuel system was checked over during the annual and all fuel screens, which were clean, were checked at that time, however, we checked them again. All were clean and in good condition.
>
> 2nd start and run-up
>
> After putting the airplane back together, engine started no problem this time and ran beautifully smooth for the entire warm-up and run-up. All engine parameters were normal. Engine was run for approximately 20 mins.
>
> 3rd start and run-up
>
> Same story as the second, engine started no problem and ran beautifully smooth for the entire warm-up and run-up. All engine parameters normal. Engine was run for approximately 20 mins. Only anomaly found was a broken line from the compressor to the snot valve.
>
> At this point, whatever clean-up and recheck of the fuel system we had done was leading us to believe that the issue may have been a one-time event, but with no hard and fast culprit in custody, we were suspicious that the problem was not corrected so more run-ups were in order.
>
> 4th start and attempted run-up
>
> Engine started beautifully on very little prime and ran smoothly. It took about five minutes to get up to temp and just as oil temp was approaching 40°C and CHT 140°C, then engine again just smoothly quit despite adding throttle to compensate for the dropping RPM. Fuel pressure held steady at 0.4 throughout.
>
> A few phone calls were made and we were advised to check for blockage in the fuel vents. These were checked and flushed these with compressed air.
>
> 5th start and attempted run-up
>
> After flushing the fuel vents, we started up again. Smooth start and run but within the same timeframe and temps, the engine just smoothly quit. Fuel pressure again held steady at 0.4 throughout.
>
> 6th start and run-up
>
> This time we elected to try another restart immediately so with only one shot of prime to the cylinder side, the engine again started right up and ran beautifully and continued to do so through the entire run-up. We ran it for 20 mins with no anomalies.
>
> We are now officially, totally at a loss as to what could be the cause.
>
> --------
> Stefan Corriveau
> stefancorriveau(at)hotmail.com
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=469626#469626
>
>
>
>
>
>
>
>
>
|
| | - The Matronics Yak-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Yak-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
