Today's Message Index:
----------------------
1. 04:08 PM - yak 55 engine surge, in flight (Epistaxis)
2. 04:47 PM - Re: yak 55 engine surge, in flight (Roger Kemp M.D.)
3. 06:21 PM - Re: yak 55 engine surge, in flight (Javier Carrasco)
4. 06:45 PM - Re: yak 55 engine surge, in flight (Epistaxis)
5. 07:05 PM - Front Gear Level (CJ6) (Thomas Geoghegan)
6. 07:17 PM - Re: Re: yak 55 engine surge, in flight (Roger Kemp M.D.)
7. 07:33 PM - Re: Front Gear Level (CJ6) (Roger Kemp M.D.)
Message 1
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| Subject: | yak 55 engine surge, in flight |
Hello, have a Yak55 which just presented with an engine or prop surge, after doing
moderate acro. Initial indication was a rapid loss in performance. After
throttle back, settled down to a constant surge. Fuel pressure was good and constant,have
checked the entire fuel system everything is clean and clear. Can`t
duplicate the problem on the ground during runup. But did surge again on next
test flight. Would like to know if the aneriod diaphragm or the larger pressure
diaphragm were failing could cause this, although no garbage was found in
the carb screens. Or should I focuse on the prop and governor. Governor screen
is clean as well. Has anybody run across this situation? Thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399918#399918
Message 2
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| Subject: | Re: yak 55 engine surge, in flight |
Have had the aneroid diaphragm cause surging and have had engine failure at 100%
T.O. Power due to a flapper in the fuel line that broke off and blocked the
carb fuel screen. With the flapper the surge was intermittent at high power settings.
It improved with power reduction. The diaphragm was most noticeable at
5000 to 6000 ft.
Doc
Sent from my iPad
On May 3, 2013, at 6:06 PM, "Epistaxis" <ShawnJBurwell@aol.com> wrote:
>
> Hello, have a Yak55 which just presented with an engine or prop surge, after
doing moderate acro. Initial indication was a rapid loss in performance. After
throttle back, settled down to a constant surge. Fuel pressure was good and
constant,have checked the entire fuel system everything is clean and clear. Can`t
duplicate the problem on the ground during runup. But did surge again on
next test flight. Would like to know if the aneriod diaphragm or the larger pressure
diaphragm were failing could cause this, although no garbage was found
in the carb screens. Or should I focuse on the prop and governor. Governor screen
is clean as well. Has anybody run across this situation? Thanks
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=399918#399918
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: yak 55 engine surge, in flight |
I used to have a similar issue but after prolonged discent at lw RPM settin
gs.
-
After changing to the auto spark plugs an keeping the temps over 150. never
had it again.
-
Good luck.
-
Javier Carrasco
Yak-55m
N5245H
--- On Fri, 5/3/13, Epistaxis <ShawnJBurwell@aol.com> wrote:
From: Epistaxis <ShawnJBurwell@aol.com>
Subject: Yak-List: yak 55 engine surge, in flight
Hello,- have a Yak55 which just presented with an engine or prop surge, a
fter doing- moderate acro. Initial indication was a rapid loss in perform
ance. After throttle back, settled down to a constant surge. Fuel pressure
was good and constant,have checked the entire fuel system everything is cle
an and clear. Can`t duplicate the problem on the ground during runup. But d
id surge again on next test flight. Would like to know if the aneriod diaph
ragm or the larger pressure diaphragm were failing could cause this, althou
gh no garbage was found in the carb screens. Or should I focuse on the prop
and governor. Governor screen is clean as well.- Has anybody run across
this situation?- - ---Thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399918#399918
le, List Admin.
Message 4
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| Subject: | Re: yak 55 engine surge, in flight |
Doc, thanks for the response, could you please clarify where you found sections
of the flapper valve, which filter IE...course or fine on the firewall or in
the carb inlet course screen, and was this part of the emergency fuel shut off
flap. In addition, this evening after returning to the hanger and after the test
flight this afternoon have found fuel dripping from and around the spray
bar in the carb venturi. Thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399929#399929
Message 5
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| Subject: | Front Gear Level (CJ6) |
Today when I turned on my main air, I had a rush of air escaping near the front
gear handle. Cycling between down & neutral didn't stop the leak, with the neutral
position producing more hissing.
Looking at the front of the selector assembly, there appears to be two holes (to
the left of the selector & behind the gear slide lock) overtop each other. The
air is escaping from the bottom hole.
Can some one explain how this shifter assembly is constructed? Is it repairable
or does the entire unit get replaced?
Thanks,
Tommy
Message 6
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| Subject: | Re: yak 55 engine surge, in flight |
A 6 mm and a 4 mm fragment of the inner liner of the main fuel line to the carb.
We found it in the finger screen in the carb. It is not uncommon to have a small
amount of fuel drip out of the carb after shutdown especially if you do not
advance the throttle to wide open just as you cut the mags off. I am by no
means an expert on the carb.
Doc
Sent from my iPad
On May 3, 2013, at 8:43 PM, "Epistaxis" <ShawnJBurwell@aol.com> wrote:
>
> Doc, thanks for the response, could you please clarify where you found sections
of the flapper valve, which filter IE...course or fine on the firewall or in
the carb inlet course screen, and was this part of the emergency fuel shut off
flap. In addition, this evening after returning to the hanger and after the
test flight this afternoon have found fuel dripping from and around the spray
bar in the carb venturi. Thanks
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=399929#399929
>
>
>
>
>
>
>
>
>
>
Message 7
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| Subject: | Re: Front Gear Level (CJ6) |
Put your a/c up on jacks for safety as if you are going to swing the gear to test
them. Place the rear gear selector in the down position. Move the front cockpit
selector to the neutral position with the air turned own. If the hissing
in the front cockpit transfers to the rear cockpit selector then it is a check
valve from one of the gear check valves that is leaking. If there is no RCP selector
leakage then it is the FCP selector that is bad. That is the way it works
in the YAK. Just finished changing the FCP gear selector on the 52.
Sent from my iPad
On May 3, 2013, at 9:03 PM, Thomas Geoghegan <thomasg@infosysnetworks.com> wrote:
>
> Today when I turned on my main air, I had a rush of air escaping near the front
gear handle. Cycling between down & neutral didn't stop the leak, with the
neutral position producing more hissing.
>
> Looking at the front of the selector assembly, there appears to be two holes
(to the left of the selector & behind the gear slide lock) overtop each other.
The air is escaping from the bottom hole.
>
> Can some one explain how this shifter assembly is constructed? Is it repairable
or does the entire unit get replaced?
>
> Thanks,
> Tommy
>
>
>
>
>
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