YS 91 ac - Check valves

[John Gayer]

If you put them back to back, you won't have to worry about them failing 
ever again.
John


Anthony Romano wrote:
> Heres an idea. Use one YS check valve, likely to stick open, and use on 
> OS check valve, likely to stick closed and you will be all set!
> 
> 
> 
> 
> 
> 
>> From: "Henderson,Eric" <Eric.Henderson at gartner.com>
>> Reply-To: discussion at nsrca.org
>> To: <discussion at nsrca.org>
>> Subject: RE: YS 91 ac - Check valves
>> Date: Thu, 10 Apr 2003 09:22:56 -0400
>>
>> Anthony.
>>          Here's a dilemma for you. I had a problem with my OS 1.60 FI 
>> and immediately thought it was the injector. WRONG! There was no 
>> pressure in the tank. No pressure for the injector to use so 
>> injector-like problems... The weird thing was that the flapper in the 
>> check valve stuck in the closed position. It would work all day and 
>> then be closed the next day. I tried a few fixes with a file!!! but it 
>> still stuck the next day. Washed it, polished it even kissed it!, but 
>> still it did it again. Eventually put a motley-old-YS-check-valve in 
>> it and it runs like a watch. (BTW - the YS and OS check valves look 
>> identical)
>>
>> Could not diagnose why the silicone would stick to the "outgoing" 
>> section. It would stick even when disassembled! My best guess was that 
>> the seat was too sharp...
>>
>> Putting two check valves in gives you double the chance of a check 
>> valve staying closed.... :-)
>>
>> Eric.
>>
>> -----Original Message-----
>> From: discussion-request at nsrca.org
>> [mailto:discussion-request at nsrca.org]On Behalf Of Anthony Romano
>> Sent: Thursday, April 10, 2003 9:03 AM
>> To: discussion at nsrca.org
>> Subject: Re: YS 91 ac
>>
>>
>> Started putting two check valves in my planes just in case. The weight
>> penalty is worth it.
>>
>>
>>
>>
>>
>>
>>
>> >From: "jim ivey" <jivey61 at msn.com>
>> >Reply-To: discussion at nsrca.org
>> >To: discussion at nsrca.org
>> >Subject: Re: YS 91 ac
>> >Date: Wed, 09 Apr 2003 16:50:28 -0400
>> >
>> >William
>> >Eric hit the nail on the head. I had a problem,with a friends plane just
>> >like this at The Peach Pattern Classic 2 weeks ago and it was the check
>> >valve.I caught the problem when the tank didn't phutt(spew) much when
>> >relieved of pressure.We changed the check valve and then had to reneedle
>> >the engine.This solved the problem.
>> >I have had these pressure problems enough times, that I have made a
>> >pressure tester.I used a hobby tire pump, a check valve (to keep the
>> >pressure from leaking back through the pump) and a pressure gauge from
>> >automotive supply.Plumb it with fuel tubing and you are in business. 
>> remove
>> >the fuel supply tube from the engine and apply pressure here.This checks
>> >the whole tank system,including the check valve. I usually pump to 10 
>> psi
>> >since the YS runs at 6-8 PSI. A tight system will hold pressure 'till 
>> next
>> >week.
>> >
>> >Now all you-uns check my english too,'" etc.Not my best class in school
>> >either.
>> >
>> >Jim Ivey
>> >
>> >Jim Ivey
>> >
>> >
>> >
>> >jivey61 at msn.com
>> >
>> >
>> >
>> >
>> >
>> >>From: "William Clemons" <W.Clemons at m.cc.utah.edu>
>> >>Reply-To: discussion at nsrca.org
>> >>To: <discussion at nsrca.org>
>> >>Subject: YS 91 ac
>> >>Date: Wed, 9 Apr 2003 12:42:00 -0600
>> >>
>> >>This is for the guys with YS 91 ac experience.  Have you ever had 
>> just a
>> >>loss of pressure from the engine?  It will run fine for a minute and 
>> then
>> >>dies.  I checked the fuel system for air leaks but cannot find any.  I
>> >>even swapped needle valve assemblies thinking I might have a worn 
>> out one.
>> >>  Any help is appreciated the engine has run fine up to this point.
>> >>Thanks in advance
>> >>William
>> >
>> >
>> >_________________________________________________________________
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>> >=====================================
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>> >
>>
>>
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