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Thread: Fuel valve replacement

  1. #11
    Gilbert Pierce's Avatar
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    Default Re: Fuel valve replacement

    The Univair valve is an Allen Aviation Products 6S122 valve that Univair certifies as FAA/PMA and files a notch in it to fit the TriPacer.
    Here are the internal parts. The “O” rings are common MS items.

    https://www.extraaircraft.com/docs/service/SL300902.pdf
    Last edited by Gilbert Pierce; 11-02-2019 at 04:55 PM.

  2. #12
    59pacer's Avatar
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    Default Re: Fuel valve replacement

    Quote Originally Posted by Gilbert Pierce View Post
    The Univair valve is an Allen Aviation Products 6S122 valve that Univair certifies as FAA/PMA and files a notch in it to fit the TriPacer.
    Here are the internal parts. The O rings are common MS items.

    https://www.extraaircraft.com/docs/service/SL300902.pdf
    I reinstalled the original Piper handle on the Univair valve, but it always felt that it might come off in my hand some time, it was so sloppy. I bought one of the Aircraft Spruce types that was machined out of solid, and that is much more 'comforting'.

  3. #13

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    Default Re: Fuel valve replacement

    Quote Originally Posted by Gilbert Pierce View Post
    The Univair valve is an Allen Aviation Products 6S122 valve that Univair certifies as FAA/PMA and files a notch in it to fit the TriPacer.
    Here are the internal parts. The “O” rings are common MS items.

    https://www.extraaircraft.com/docs/service/SL300902.pdf
    Thanks a bunch! I spent hours going the the o-ring files until I found matching rings. Great info.

  4. #14

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    Default Re: Fuel valve replacement

    Quote Originally Posted by Old3pacer View Post
    Enjoyed reading your experience.
    I have often wondered why it was non-service-able.
    Well, that's Univair's claim anyway. I just rebuilt the Univair valve using the Dakota drawing and instructions since the valves are identical minus one o-ring for the BOTH position. I had to make a very small ring compressor with a lot of fuel lube keep the OFF port o-ring from pinching on assembly. Now I have a spare valve. If they're really worried about liability from someone rebuilding it incorrectly then they should make a sealed unit.

  5. #15

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    Default Re: Fuel valve replacement

    Quote Originally Posted by Mireaviation View Post
    Well, that's Univair's claim anyway. I just rebuilt the Univair valve using the Dakota drawing and instructions since the valves are identical minus one o-ring for the BOTH position. I had to make a very small ring compressor with a lot of fuel lube keep the OFF port o-ring from pinching on assembly. Now I have a spare valve. If they're really worried about liability from someone rebuilding it incorrectly then they should make a sealed unit.
    The allen / univair is a nice valve, and the new orings should install easily, put mine together and wet the new orings with gas and it went right together, are you sure you had the correct size orings? MS29513-011 and MS29513-114, went together with ease and no leaks.

    DC calls out there own part number, but I used the above MS orings when I rebuilt my Univair valve and the off port small orings seated correctly they both went into the valve body with just a light push, no oring compressor required. Might double check you were given the correct orings.

    Last edited by SMO22; 11-03-2019 at 03:34 PM.

  6. #16

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    Default Re: Fuel valve replacement

    Not sure at all honestly. I used a NAS ring that I found from some old Boeing stock, looked identical. I ordered the same numbers from the 6S122 doc this morniing just to be certain. It turns freely and it helt 10 psi but ill definitely redo. There were some big chunks missing from those -011 o-rings when I first dissasembled.
    Really appreciate the responses.

  7. #17

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    Default Re: Fuel valve replacement

    SMO22,

    I have a PA-22 with a tight fuel selector valve when switching tanks. Do you still have a good working valve to sell? Does it have the plastic cone type which would eliminate the AD? It has Off,right and left positions? How much would it cost?

    Harley

  8. #18
    andya's Avatar
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    Default Re: Fuel valve replacement

    when is the last time it was disassembled cleaned up and re-installed with some fuel lube?
    "Progress is our most important problem"

  9. #19
    Glen Geller's Avatar
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    Default Re: Fuel valve replacement

    What Andy said.
    Before you spend many hundreds on a new valve, which is a good bit of work to replace, why not drain your fuel tanks and try disassembling, cleaning, lubing and rebuilding your existing valve for about $30?
    Lot's of discussion on this thread:
    https://www.shortwingpipers.org/foru...=fuel+selector

    And here is a procedure to R&R the moving part of the valve without removing the valve body from the airplane.
    You'll need a tube of Fuel Lube and replacement O-Ring MS29513-011. Takes a couple of hours once you wrap your head around how the detent washer works.
    https://docs.google.com/viewer?a=v&p...jgxYjQ3NDcwZDQ
    https://www.aircraftspruce.com/catal...SABEgK1GPD_BwE
    Of course this work should be supervised by your favorite A&P to be legal.

    GG
    Last edited by Glen Geller; 09-10-2021 at 12:29 PM.
    Glen Geller
    1955 PA22-150 "One For Papa!"

  10. #20
    andya's Avatar
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    Default Re: Fuel valve replacement

    Here is a quick review on servicing the fuel valve
    Attached Files Attached Files
    "Progress is our most important problem"

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