YS 91 ac - Check valves

[Henderson,Eric]

It is not a solid disk. It has an incomplete annulus that creates a flapper valve. It actually sticks to the Ali surface. Very odd.

Eric.

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of george kennie
Sent: Thursday, April 10, 2003 1:21 PM
To: discussion at nsrca.org
Subject: Re: YS 91 ac - Check valves


Sounds like the diameter of the silicon disc is oversize.

"Henderson,Eric" wrote:

> 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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