Today's Message Index:
----------------------
1. 08:09 AM - Air leak (keithmckinley)
2. 08:38 AM - Re: Air leak (James Goolsby)
3. 04:54 PM - Re: Air leak (keithmckinley)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
I developed a pretty bad air leak this summer coming from the rear gear selector
port. I had never used the rear gear selector or the rear flap selector for
that matter but found myself giving some dual from the rear cockpit so I started
using those gear and flap selectors, which is when the trouble started. I
found that with a certain amount of rapid cycling (from down to neutral) the rear
gear selector seemed to "re seat" and the hissing would stop. Later on when
the leak got bad again I used some castor oil through the valve 'in" port. This
stopped the majority of the leak and my pressure was building and holding
with the engine running. Around this time I also developed a bad hiss from the
rear flap selector. I replaced the the rear flap selector and this seemed to
stop that leak.
Fast forward to the last few months and the front gear selector is constantly venting
and the front flap selector is REALLY venting in all positions. The rear
gear selector seems quiet but I can feel a small amount of air venting from
the port whenever the system is pressurized. My air compressor cannot keep up
with the leaks. Thinking the problem was the selectors, I replaced the front gear
selector and the front flap selector. This did not help at all.
So at this point all the QSF-2A's have been replaced
Today I pulled all the up lines off the 3 gear actuators at the actuators and the
down line from the flap actuator and pressurized the system. I did not have
any air leaking from the open side of any actuators at all so the actuators are
all good. I did notice that the lines I disconnected from the 3 gear actuators
and the line from the flap actuator had a very small amount of air venting
through.
The emergency system was also checked at the fire wall check valves and NO air
is entering the system from the emergency side. both check valves are fine.
GEAR:
My determination is that the air is being back fed through the system and the only
culprit on the gear side could be the rear gear selector. Today, as soon as
I replaced the rear gear selector the air stopped back feeding in the lines
and therefore stopped venting from the front and rear gear selector ports. My
guess is my front gear selector was fine all along and that it has been a bad
rear selector for quite a while.
FLAP:
The new front flap selector is still leaking really bad and the new rear selector
is quiet. I pressurized the system again and tried every different combination
of front and rear flap selectors settings and the hissing from the front
selector did not stop. I confirmed that during the checks that when the front
flap handle was in the up position, placing the rear flap handle in the down position
correctly caused the flaps to extend. However, placing the front flap
selector in the down position, extending the flaps, and then placing the rear
flap handle in the up position DID NOT retract the flaps.
The ONLY thing I can surmise is that a bad flap diverter valve is the culprit for
the venting in the front flap selector?? How would this be possible with a
brand new rear flap selector in the neutral position?
This post sheds a little light:
http://forums.matronics.com/viewtopic.php?t=40645&highlight=diverter
Obviously I need to replace one, perhaps both flap diverter valves, but what else
am I missing here??? This is driving me nuts..
Thanks,
--------
Keith McKinley
700HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393132#393132
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
What about the flap actuator itself? Bad seals in the actuator will allow air
pass the piston and vent out either flap handel.
Jim " Pappy" Goolsby
Sent from my iPad from some where on The 3rd rock from the Sun.
On Jan 27, 2013, at 11:07 AM, "keithmckinley" <keith.mckinley@townisp.com> wrote:
>
> I developed a pretty bad air leak this summer coming from the rear gear selector
port. I had never used the rear gear selector or the rear flap selector for
that matter but found myself giving some dual from the rear cockpit so I started
using those gear and flap selectors, which is when the trouble started.
I found that with a certain amount of rapid cycling (from down to neutral) the
rear gear selector seemed to "re seat" and the hissing would stop. Later on when
the leak got bad again I used some castor oil through the valve 'in" port.
This stopped the majority of the leak and my pressure was building and holding
with the engine running. Around this time I also developed a bad hiss from the
rear flap selector. I replaced the the rear flap selector and this seemed to
stop that leak.
>
> Fast forward to the last few months and the front gear selector is constantly
venting and the front flap selector is REALLY venting in all positions. The rear
gear selector seems quiet but I can feel a small amount of air venting from
the port whenever the system is pressurized. My air compressor cannot keep up
with the leaks. Thinking the problem was the selectors, I replaced the front
gear selector and the front flap selector. This did not help at all.
>
> So at this point all the QSF-2A's have been replaced
>
> Today I pulled all the up lines off the 3 gear actuators at the actuators and
the down line from the flap actuator and pressurized the system. I did not have
any air leaking from the open side of any actuators at all so the actuators
are all good. I did notice that the lines I disconnected from the 3 gear actuators
and the line from the flap actuator had a very small amount of air venting
through.
>
> The emergency system was also checked at the fire wall check valves and NO air
is entering the system from the emergency side. both check valves are fine.
>
> GEAR:
>
> My determination is that the air is being back fed through the system and the
only culprit on the gear side could be the rear gear selector. Today, as soon
as I replaced the rear gear selector the air stopped back feeding in the lines
and therefore stopped venting from the front and rear gear selector ports.
My guess is my front gear selector was fine all along and that it has been a bad
rear selector for quite a while.
>
> FLAP:
>
> The new front flap selector is still leaking really bad and the new rear selector
is quiet. I pressurized the system again and tried every different combination
of front and rear flap selectors settings and the hissing from the front
selector did not stop. I confirmed that during the checks that when the front
flap handle was in the up position, placing the rear flap handle in the down
position correctly caused the flaps to extend. However, placing the front flap
selector in the down position, extending the flaps, and then placing the rear
flap handle in the up position DID NOT retract the flaps.
>
> The ONLY thing I can surmise is that a bad flap diverter valve is the culprit
for the venting in the front flap selector?? How would this be possible with
a brand new rear flap selector in the neutral position?
>
> This post sheds a little light:
>
> http://forums.matronics.com/viewtopic.php?t=40645&highlight=diverter
>
> Obviously I need to replace one, perhaps both flap diverter valves, but what
else am I missing here??? This is driving me nuts..
>
> Thanks,
>
> --------
> Keith McKinley
> 700HS
> KFIT
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=393132#393132
>
>
>
>
>
>
>
>
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Hi Pappy,
If you read my trouble shooting again you'll see I disconnected one side of every
actuator on the de-pressurized side then pressurized the system. there was
no air leaking through any actuators at all. In fact the hoses that I had disconnected
from the actuators had some air flowing which means it is back-feeding
in the system. I solved that problem with a new rear gear selector. I'm guessing
the flap issue is in a bad flap diverter valve, but I just dont have a good
feel for the way air goes through that flap system.
BTW, whoever did the full color air schematic for the CJ... it has been a GREAT
help!!!
Keith
--------
Keith McKinley
700HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393150#393150
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|