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Thread: Fuel Selector Repair

  1. #131
    andya's Avatar
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    Default Re: Fuel Selector Repair

    If you can disassemble it and get to the O-ring, you can probably determine the size by comparing with O-rings in one of those O-ring kits. If they are not completely deformed, measure with a caliper and ck ACS for comparable size.

    https://www.aircraftspruce.com/catal...?clickkey=3766

    the original piper valve used this series, that's what I replaced them with back a few years.
    "Progress is our most important problem"

  2. #132

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    Default Re: Fuel Selector Repair

    Found what I was looking for by going back rereading the previous postings. Not in as much of a hurry this time.........1great information on this site

  3. #133
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    Default Re: Fuel Selector Repair

    I found two MS28775-114 for the body if leaking around the snap rings and MS28775-011 for the ports. A lot of times putting fuel to it the seals will come back. Use a plastic bag to keep the balls and springs from ejecting to never never land.
    IMG_20180607_122400.jpgIMG_20180607_122424.jpgIMG_20180607_122653.jpg

    Found the old post by Jim on Page 6 of this thread as well.
    Last edited by Steve Pierce; 06-07-2018 at 12:50 PM.

  4. #134

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    Default Re: Fuel Selector Repair

    If it is the Allen 6S122, here is a service letter from Extra Aircraft with a parts breakdown
    http://www.extraaircraft.com/docs/service/SL300902.pdf

    I rebuilt mine using fuel resistant MS29513 orings for both 011 and 114, don't know why the parts breakdown in the service letter calls for the viton rubber smaller oring.
    https://www.aircraftspruce.com/pages...uelorings2.php

  5. #135
    Gilbert Pierce's Avatar
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    Default Re: Fuel Selector Repair

    They should all be viton. viton is fuel resistant.
    https://www.wcrp.uk.com/technical/ma...el-resistance/

    This site says Viton is excellent ethanol.
    https://www.calpaclab.com/viton-chem...ibility-chart/

  6. #136

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    Default Re: Fuel Selector Repair

    The attached parts list is from the service letter Extra issued. The MS29513 is fuel resistant, maybe not ethanol resistant. The difference I have heard is viton does not hold up to cold temperature as well as the MS29513 orings do. Allen calls out the MS29513-114 for the large oring and than the M83248/1-011 for the small one, a call to Allen if that's who the manufacturer of the Univair valve is could get an answer possibly.
    Attached Images Attached Images

  7. #137
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    Default Re: Fuel Selector Repair

    In the middle of replacing the old valve with a Dakota valve. What thread sealer are you guys using if anything. I was going to use the permatex thread sealant with teflon.


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  8. #138
    Administrator Steve Pierce's Avatar
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    Default Re: Fuel Selector Repair

    Quote Originally Posted by Shermanj1 View Post
    In the middle of replacing the old valve with a Dakota valve. What thread sealer are you guys using if anything. I was going to use the permatex thread sealant with teflon.


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    I use the Loctite equivalent.1528916024756.jpg

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  9. #139
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    Default Re: Fuel Selector Repair

    Quote Originally Posted by Steve Pierce View Post
    I use the Loctite equivalent.1528916024756.jpg

    Sent from my Pixel 2 XL using ShortWingPipers.Org mobile app
    Thanks man!!!


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  10. #140

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    Default Re: Fuel Selector Repair

    For 65 years the fuel selector on my Pacer turned hard. This annual the IA said he could fix it. He took it out, resealed it with viton seals, smoothed the brass cone and used some special grease and the selector works smooth and easy.

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