Today's Message Index:
----------------------
1. 06:35 AM - Re: Re: more air leaks (Jill Gernetzke)
2. 07:03 AM - Re: Yak-List Digest: 8 Msgs - 09/20/12 (Buddy Moman)
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 |
|
| Subject: | Re: Re: more air leaks |
Walt,
You are right about the o-rings. The are 3 in the Russian 3-port valve
(Shaft, piston and body) and 1 (Body) in the 5-port. The CJ 3-port has 2
and none in the 5-port.
I have them precision polished (not in-house). Some customers tell me that
they have had luck lapping the valve bodies to one another. When I receive
a valve for overhaul, it is usually beyond that state.
Steve,
A long shot on the flap actuator - if it has been leaking since you
reinstalled - the seal in the end cap may have been put in backwards. Easy
to do if you didn't have photos of the disassembly or rebuild them
frequently. We test all of our pneumatic component to 750 psi before they
go out the door and use an ultrasonic leak detector during the process.
Removing and reinstalling that actuator is not a fun job. : (
Jill
M-14P, Inc.
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 |
|
| Subject: | Re: Yak-List Digest: 8 Msgs - 09/20/12 |
Good comeback.
Buddy
On Sep 21, 2012, at 2:02 AM, Yak-List Digest Server wrote:
> *
>
> =================================================
> Online Versions of Today's List Digest Archive
> =================================================
>
> Today's complete Yak-List Digest can also be found in either of the
> two Web Links listed below. The .html file includes the Digest formatted
> in HTML for viewing with a web browser and features Hyperlinked Indexes
> and Message Navigation. The .txt file includes the plain ASCII version
> of the Yak-List Digest and can be viewed with a generic text editor
> such as Notepad or with a web browser.
>
> HTML Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 12-09-20&Archive=Yak
>
> Text Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 12-09-20&Archive=Yak
>
>
> ===============================================
> EMail Version of Today's List Digest Archive
> ===============================================
>
>
> ----------------------------------------------------------
> Yak-List Digest Archive
> ---
> Total Messages Posted Thu 09/20/12: 8
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 05:59 AM - Re: more air leaks (Jill Gernetzke)
> 2. 06:09 AM - Re: Re: more air leaks (A. Dennis Savarese)
> 3. 07:09 AM - Re: Re: more air leaks (A. Dennis Savarese)
> 4. 09:08 AM - Re: Re: more air leaks (Walter Lannon)
> 5. 12:27 PM - CJ gear woes (Elmar & Manuela Hegenauer)
> 6. 01:55 PM - Re: CJ gear woes (J Rittenbach)
> 7. 04:14 PM - Re: more air leaks (Rob Rowe)
> 8. 07:11 PM - Re: more air leaks (bizbug182)
>
>
>
> ________________________________ Message 1 _____________________________________
>
>
> Time: 05:59:58 AM PST US
> From: "Jill Gernetzke" <jill@m-14p.com>
> Subject: Yak-List: Re: more air leaks
>
>
>
> Steve and Group,
>
> If your leak is in the rear cockpit floor area, then you may have a flap
> actuator leak. We rebuild the flap actuators and also sell seal kits and
> seal rings for them. I have found that people focus on all of the landing
> gear components, but neglect the flap actuator until there is a problem with
> it. The pitfall of not overhauling the flap actuator every 5 -7 years is
> that the internal parts rust away and they are not available. Like I said,
> we manufacture the seal rings and seal kits and are in process of
> manufacturing the flap actuator shaft and the cage/piston assembly.
>
> We also rebuild and sell the flap/landing gear valves, plus seals.
>
> Cheers,
>
> Jill
> M-14P, Inc.
> www.m-14p.com
>
>
> ________________________________ Message 2 _____________________________________
>
>
> Time: 06:09:04 AM PST US
> From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
> Subject: Re: Yak-List: Re: more air leaks
>
>
> Excellent point (as always) Jill.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 9/20/2012 7:57 AM, Jill Gernetzke wrote:
>>
>>
>> Steve and Group,
>>
>> If your leak is in the rear cockpit floor area, then you may have a flap
>> actuator leak. We rebuild the flap actuators and also sell seal kits and
>> seal rings for them. I have found that people focus on all of the landing
>> gear components, but neglect the flap actuator until there is a problem with
>> it. The pitfall of not overhauling the flap actuator every 5 -7 years is
>> that the internal parts rust away and they are not available. Like I said,
>> we manufacture the seal rings and seal kits and are in process of
>> manufacturing the flap actuator shaft and the cage/piston assembly.
>>
>> We also rebuild and sell the flap/landing gear valves, plus seals.
>>
>> Cheers,
>>
>> Jill
>> M-14P, Inc.
>> www.m-14p.com
>>
>>
>
>
> ________________________________ Message 3 _____________________________________
>
>
> Time: 07:09:55 AM PST US
> From: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
> Subject: Re: Yak-List: Re: more air leaks
>
>
> If I would have read more carefully and COMPREHENDED what you wrote, I
> would have said the flap actuator was probably leaking as Jill points
> out. In fact, I would take Jill's advice first and remove the flap
> actuator and overhaul it. As Jill says, they have the overhaul kits in
> stock for the flap actuator and the shuttle valves.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 9/20/2012 8:06 AM, A. Dennis Savarese wrote:
>> <dsavarese0812@bellsouth.net>
>>
>> Excellent point (as always) Jill.
>> Dennis
>>
>> A. Dennis Savarese
>> 334-285-6263
>> 334-546-8182 (mobile)
>> www.yak-52.com
>> Skype - Yakguy1
>>
>> On 9/20/2012 7:57 AM, Jill Gernetzke wrote:
>>>
>>>
>>> Steve and Group,
>>>
>>> If your leak is in the rear cockpit floor area, then you may have a flap
>>> actuator leak. We rebuild the flap actuators and also sell seal kits
>>> and
>>> seal rings for them. I have found that people focus on all of the
>>> landing
>>> gear components, but neglect the flap actuator until there is a
>>> problem with
>>> it. The pitfall of not overhauling the flap actuator every 5 -7
>>> years is
>>> that the internal parts rust away and they are not available. Like I
>>> said,
>>> we manufacture the seal rings and seal kits and are in process of
>>> manufacturing the flap actuator shaft and the cage/piston assembly.
>>>
>>> We also rebuild and sell the flap/landing gear valves, plus seals.
>>>
>>> Cheers,
>>>
>>> Jill
>>> M-14P, Inc.
>>> www.m-14p.com
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>
> ________________________________ Message 4 _____________________________________
>
>
> Time: 09:08:55 AM PST US
> From: "Walter Lannon" <wlannon@shaw.ca>
> Subject: Re: Yak-List: Re: more air leaks
>
>
> Jill;
>
> Do you have the precision grinding and lapping facilities to overhaul the
> gear and flap control valves?
> There are only two "O" rings in each valve and they are virtually never the
> source of the leakage. Leakage is caused by corrosion and/or scoring of the
> fixed, steel, surface and the bronze rotor.
> The only possible repair is by an EXTREMELY precise re-grind of the stator
> and perfect machine lapping the the rotor.
>
> I just finished replacing 3 out of 4 control valves on one CJ (both gear
> valves and the fwd. flap valve).
>
> Cheers;
> Walt
>
> -----Original Message-----
> From: Jill Gernetzke
> Sent: Thursday, September 20, 2012 5:57 AM
> Subject: Yak-List: Re: more air leaks
>
>
>
> Steve and Group,
>
> If your leak is in the rear cockpit floor area, then you may have a flap
> actuator leak. We rebuild the flap actuators and also sell seal kits and
> seal rings for them. I have found that people focus on all of the landing
> gear components, but neglect the flap actuator until there is a problem with
> it. The pitfall of not overhauling the flap actuator every 5 -7 years is
> that the internal parts rust away and they are not available. Like I said,
> we manufacture the seal rings and seal kits and are in process of
> manufacturing the flap actuator shaft and the cage/piston assembly.
>
> We also rebuild and sell the flap/landing gear valves, plus seals.
>
> Cheers,
>
> Jill
> M-14P, Inc.
> www.m-14p.com
>
>
> ________________________________ Message 5 _____________________________________
>
>
> Time: 12:27:19 PM PST US
> From: Elmar & Manuela Hegenauer <samira.h@shaw.ca>
> Subject: Yak-List: CJ gear woes
>
>
> On my way back from the Oliver YAK Fly-In
> I have enjoyed a little gear incident. Small
> rubber parts (debris) from the check valves
> on the fire wall have migrated into my rear
> cockpit gear up-down valve and clogged it
> completely.
>
> I guess it might be a good idea to inspect and
> clean the air lines from the check valves to the
> gear and flap valves at every annual.
>
> cheers
>
> Elmar
>
>
> ________________________________ Message 6 _____________________________________
>
>
> Time: 01:55:50 PM PST US
> From: J Rittenbach <jrittenbach@rocketmail.com>
> Subject: Re: Yak-List: CJ gear woes
>
> -=0AGents,=0AJust another quick note about our CJ air system as long as w
> e are on the subject.- A lesson learned for me recently to be shared just
> in case it may help anyone of you I ride the wing with to avoid an unsettl
> ing event.I've had my CJ about 1.5 years.- It's had a good annual of cour
> se but I personallyhave never opened the emergency air valves until recentl
> y.-I was attempting to drain the emergency air in order to reroute the-
> emergency air line exiting-from the emergency air tank to avoid some new
> unassociated hardware I'm putting in.- When I opened the emergency air va
> lve, I-found a loud rush of air coming from the left emergency air hose
> -that connects to the-left gear actuator and the front cockpit emergenc
> y air gauge didn't budge off 45 atm even when the hissing stopped.- Not s
> ure how much emergency air time and pressure I would have had in a real eme
> rgency with that large of a leak-and-the gauge would have been misleadi
> ng-of course.- Now
> going through my check valves as I replace hoses-and gauges, I find a ch
> eck valve I replaced a year ago is already dreadfully, nay, completely inco
> mpetent as well.- Long story short,-I'll be checking the valves, gauges
> , hoses, lines and emergency air system and changing the desiccate much mor
> e regularly from now on.=0ABlue Skies=0A-=0AJ. Rittenbach=0A=0A-=0AFrom
> : Elmar & Manuela Hegenauer <samira.h@shaw.ca>=0ATo: yak-list@matronics.com
> =0ASent: Thursday, September 20, 2012 12:24 PM=0ASubject: Yak-List: CJ gea
> ra.h@shaw.ca>=0A=0AOn my way back from the Oliver YAK Fly-In=0AI have enjoy
> ed a little gear incident. Small=0Arubber parts (debris) from the check val
> ves=0Aon the fire wall have migrated into my rear=0Acockpit gear up-down va
> lve and clogged it=0Acompletely.=0A=0AI guess it might be a good idea to in
> spect and=0Aclean the air lines from the check valves to the=0Agear and fla
> - - - - - - - - - - - - - - - -Matt Dralle, L
> ======
>
> ________________________________ Message 7 _____________________________________
>
>
> Time: 04:14:01 PM PST US
> Subject: Yak-List: Re: more air leaks
> From: "Rob Rowe" <yak-list@robrowe.plus.com>
>
>
> Steve,
>
> Don't forget that in a -52 there are also two shuttle valves to differentiate
between
> the front and rear cockpit flap selectors feeding air to the flap actuator.
>
> To help narrow down what may be at fault you could try the following (in exact
> order);
>
> 1/ Put both cockpit flap selectors in neutral and then turn Main air on
>
> 2/ Put Front flap selector to Up position
> - if air venting from Front selector then Up shuttle valve OK, go to 3/
> - if air venting from Rear selector then Up shuttle valve is compromised
> - if air is leaking, but not from either selector, then suspect the feed pipe
from
> the Front selector to the Up shuttle valve. Look for pinhole at a low point
> in pipe run
>
> 3/ Put Front flap selector to Neutral & Rear flap selector to Up
> - if air venting from Front selector then Actuator is compromised
> Note : some chance that disturbing Up shuttle may also cause it to leak to Front
> selector. So repeat ALL of above from beginning several times to give it a chance
> to re-seat before condemning Actuator
> - if no air venting then Front selector is compromised (exercising several times
> might help relieve minor corrosion)
>
> Hope this helps.
>
> Rob R
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=383659#383659
>
>
> ________________________________ Message 8 _____________________________________
>
>
> Time: 07:11:09 PM PST US
> Subject: Yak-List: Re: more air leaks
> From: "bizbug182" <completeairnt@bigpond.com>
>
>
> thanks for the replies everyone the leaking air is definitely from one of the
vent
> tubes on the underside of the fuse in the middle of the wings.
> We had the flap actuator out not that long ago and repaired
> Will have a go at the suggestions and see how we go
>
> regards steve
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=383674#383674
>
>
>
>
>
>
>
>
>
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! --
|