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[Non-DoD Source] Re: No SNOT

 
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mark.bitterlich(at)navy.m
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PostPosted: Sat Oct 14, 2017 9:52 am    Post subject: [Non-DoD Source] Re: No SNOT Reply with quote

Go back to the pop-off valve assembly, connect your high pressure air bottle there and blow the air BACKWARDS towards the compressor. You'll need to have at least 500 PSI of air. You will more than likely find your problem. Either the crush washers are leaking, or ... your banjo ring check valve assy is leaking air backwards. This will have all the indications of a bad compressor. If everything checks good during this test, and there are no leaks, then your compressor or drive assembly is bad.
________________________________________
From: owner-yak-list-server(at)matronics.com [owner-yak-list-server(at)matronics.com] on behalf of Anthony Savarese [dsavarese0812(at)bellsouth.net]
Sent: Saturday, October 14, 2017 11:07 AM
To: yak-list(at)matronics.com
Subject: [Non-DoD Source] Re: No SNOT



Oops. You are correct. My bad.

Sent from my iPhone

Quote:
On Oct 14, 2017, at 10:43 AM, Hans Oortman <pa3arw(at)ziggo.nl> wrote:



Dennis,

I don't wanna be a smart ass but I think you mean air-water separator(?)
rather then air-oil separator.
After all in our air system in the Yak and I assume in the CJ as well you
wanna have some oil in the air...better for the actuators...

I think, despite the swap of all items already, there is only one thing left
again to replace...the air compressor.
In the beginning of my Yak career I have had 3 compressors that were not
doing what they were supposed to do i.e. deliver 50 bars of air. Now since
the last 12 years I've had no problem whatsoever....touch wood!

Regards,

Hans O.
PH-YAK
Op 14-10-17 15:38, A. Dennis Savarese <dsavarese0812(at)bellsouth.net> schreef:

>
> <dsavarese0812(at)bellsouth.net>
>
> No. The snot bottle is an air-oil separator anddoes its jobfrom the
> beginning of the first burst of air pressure from the compressor.
>
> A. Dennis Savarese
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
>> On 10/14/2017 9:30 AM, Justin Drafts wrote:
>> Sounds like everything that can and should be checked/replaced/cleaned
>> has been, possibly (?) barring extensive port cleaning Dennis
>> describes...
>> I'm wondering... is there a minimum system pressure required in the
>> main tank & lines before the snot-pot will give its typical & very
>> audible behavior?
>>
>> Justin
>>
>> On Sat, Oct 14, 2017 at 7:47 AM, A. Dennis Savarese
>> <dsavarese0812(at)bellsouth.net <mailto:dsavarese0812(at)bellsouth.net>> wrote:
>>
>> Bill,
>> You said the bottle pressure increases. In your judgement, is it
>> taking longer to fill the air bottle or about the same amount of time?
>>
>> Did you remove the snot bottle and flush out all 3 orifices? ie:
>> Input side; Output side AND the drain? You can immerse the snot
>> bottle in avgas, shake it around inside the snot bottle, then with
>> your fingers, plug up two openings and let it drain out the 3rd
>> opening. Repeat the process for all 3 openings until everything
>> that flushes out is avgas-clear.
>>
>> Dennis
>>
>>
>> ------------------------------------------------------------------------
>> *From:* William Geipel <l129bs(at)gmail.com <mailto:l129bs(at)gmail.com>>
>> *To:* Yaklist <yak-list(at)matronics.com
>> <mailto:yak-list(at)matronics.com>>
>> *Sent:* Friday, October 13, 2017 11:36 PM
>> *
>>
>> <mailto:l129bs(at)gmail.com>>
>>
>> No air or discharge from SNOT valve. New air compressor, new
>> pop-off valve, cleaned entire valve, snot valve seals properly,
>> new check valve at fill point, sprayed so much soapy water that I
>> was afraid to turn on electricity. No leaks found all the way to
>> the gauges. Blew air from compressor in to airplane: snot valve is
>> clean and tight, bottle pressure increased.
>>
>> Not much else to change. Any thoughts?
>> http://www.matronics.com/Navigator?Yak-List
>> <http://www.matronics.com/Navigator?Yak-List>
>> *
>> *s.matronics.com/ <http://s.matronics.com/>"
>> target="_blank">http://forums.matronics.com
>> <http://forums.matronics.com>
>> *
>> *http://www.matronics.com/contribution
>> *
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>>
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>
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mark.bitterlich(at)navy.m
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PostPosted: Sat Oct 14, 2017 10:00 am    Post subject: [Non-DoD Source] Re: No SNOT Reply with quote

Yes. It should have 735 PSI of air in the lines, thus the loud hiss. If there is no pressure in the lines, then there is no hiss. He has a leak. It can be the crush washers, or it can also be the check valve in the banjo assembly. The compressor reaches peak pressure when the piston comes up in the mechanism, so there is actually a rising spike of pressure as it operates. This spike opens the check valve and a burst of pressure is allowed into the lines. If this check valve is not operating properly, and remains open all the time, the system will pressurize very very slowly. If you blow air backwards towards the compressor at a high enough pressure, you will be able to either hear the leak in the crush rings on the banjo, or you will hear air leaking back through the compressor. Turning the prop over when you have this air blowing backwards will also allow you to help identify leaks. You should have constant pressure with no impact from turning the prop if everything is working correctly. If this all checks good, then it is likely you have a bad compressor,, or drive mechanism. Like a sheared coupling for example. However, he says it is making some air pressure, so that eliminates the coupling.

________________________________
From: owner-yak-list-server(at)matronics.com [owner-yak-list-server(at)matronics.com] on behalf of Justin Drafts [draftsjust417(at)gmail.com]
Sent: Saturday, October 14, 2017 9:30 AM
To: yak-list(at)matronics.com
Subject: [Non-DoD Source] Re: No SNOT

Sounds like everything that can and should be checked/replaced/cleaned has been, possibly (?) barring extensive port cleaning Dennis describes...
I'm wondering... is there a minimum system pressure required in the main tank & lines before the snot-pot will give its typical & very audible behavior?

Justin

On Sat, Oct 14, 2017 at 7:47 AM, A. Dennis Savarese <dsavarese0812(at)bellsouth.net<mailto:dsavarese0812(at)bellsouth.net>> wrote:
Bill,
You said the bottle pressure increases. In your judgement, is it taking longer to fill the air bottle or about the same amount of time?

Did you remove the snot bottle and flush out all 3 orifices? ie: Input side; Output side AND the drain? You can immerse the snot bottle in avgas, shake it around inside the snot bottle, then with your fingers, plug up two openings and let it drain out the 3rd opening. Repeat the process for all 3 openings until everything that flushes out is avgas-clear.

Dennis
________________________________
From: William Geipel <l129bs(at)gmail.com<mailto:l129bs(at)gmail.com>>
To: Yaklist <yak-list(at)matronics.com<mailto:yak-list(at)matronics.com>>
Sent: Friday, October 13, 2017 11:36 PM



No air or discharge from SNOT valve. New air compressor, new pop-off valve, cleaned entire valve, snot valve seals properly, new check valve at fill point, sprayed so much soapy water that I was afraid to turn on electricity. No leaks found all the way to the gauges. Blew air from compressor in to airplane: snot valve is clean and tight, bottle pressure increased.

Not much else to change. Any thoughts?
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