Welcome! Becoming a registered user of ShortWingPipers.Org is free and easy! Click the "Register" link found in the upper right hand corner of this screen. It's easy and you can then join the fun posting and learning about Short Wing Pipers!

Page 11 of 11 FirstFirst ... 91011
Results 101 to 108 of 108

Thread: PA-22 fuel sending unit gasket

  1. #101
    51-pa22's Avatar
    Join Date
    Sep 2008
    Location
    Waxahachie, Texas
    Posts
    508
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    Thanks for the link!!!

  2. #102
    cozzmo81's Avatar
    Join Date
    Aug 2015
    Location
    New Castle, IN
    Posts
    218
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    I’m not sure what the ones in the kits are made of, but the ones from McMaster are neoprene. From what I’ve been able to determine neoprene doesn’t stand up well to fuel. Viton would be much better.


    Sent from my iPhone using ShortWingPipers.Org
    Adam Rhoads

  3. #103

    Join Date
    Dec 2015
    Posts
    419
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    These bolts are a godsend for this job

    Quote Originally Posted by Steve Pierce View Post
    NAS1802 screws with a hex head might be a good choice. http://www.aircraftspruce.com/catalo...ewsnas1802.php

  4. #104

    Join Date
    Dec 2015
    Posts
    419
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    Quote Originally Posted by cozzmo81 View Post
    I’m not sure what the ones in the kits are made of, but the ones from McMaster are neoprene. From what I’ve been able to determine neoprene doesn’t stand up well to fuel. Viton would be much better.


    Sent from my iPhone using ShortWingPipers.Org
    I would use buna instead of viton, viton loses its seal in freezing temps, where buna rubber keeps its seal in freezing temps.

  5. #105
    Administrator Steve Pierce's Avatar
    Join Date
    Nov 2007
    Location
    Graham, Texas, United States
    Posts
    12,281
    Post Thanks / Like
    Blog Entries
    1

    Default Re: PA-22 fuel sending unit gasket

    Quote Originally Posted by SMO22 View Post
    I would use buna instead of viton, viton loses its seal in freezing temps, where buna rubber keeps its seal in freezing temps.
    https://www.manuf-rubber.com/news/bu...he-difference/
    According to this at about 5 degrees but sounds like Viton might last longer. The gasket should seal the screws so it is probably kind of a mute point. Made for an interesting read. Only thing I knew about Viton is what Brian at Steve's Aircraft posted about them using Viton in their gascolator and the infinite shelf life. Interesting that the fuel resistant o'rings MS25913 that Spruce sells are Nitrile (Buna, Buna N). I learned something new today.

  6. #106

    Join Date
    Dec 2015
    Posts
    419
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    Yes interesting if you like reading about rubber good to know stuff. For those that dont click the link, a few of the differences

    Buna vs. Viton: Which Seal for Your Application?


    As a sealing option, the crucial difference between Buna and Viton is the temperature range the materials function in. Viton is the choice over Buna for high-temperature applications. Viton seals hold indefinitely at temperatures up to 400°F and can last up to 48 hours at temperatures up to 600°F. Buna is effective to 250°F. However, it can effectively seal mechanical objects at low temperatures to –22°F. Viton seals are rendered ineffective at temperatures below 5°F, with the material becoming hard and inflexible.

    Environmental conditions also differentiate the application of Buna vs. Viton for sealing options. Viton offers universal chemical resistance for sealing applications for oils, fuels, and mineral acids. Its weatherability and resistance to mold and fungus, oxidation, ozone, and UV exposure offer additional excellent properties. Buna’s chemical resistance is much less than Viton, and its weatherability and ozone exposure limits its application where such properties are required. That said, in circumstances that do not require such properties, Buna seals do offer superior abrasion and tear resistance, and are more suitable for heavy-duty industrial applications.

    Properties of Buna O-rings

    Buna is a widely used elastomeric material known for its tensile strength and high fuel and oil resistant properties. It combines resistance with low compression set and high abrasion resistance to make it the seal industry’s most widely used economical elastomer. Buna, also referred to as Nitrile or Buna-N, is an NBR rubber that displays excellent resistance to all petroleum-based oils and fuels, as well as water, various alcohols, silicone greases, and hydraulic fluids. It offers such other advantages as good tear resistance and non-polar solvent resistance. It’s also less expensive than fluoroelastomers.


    Properties of Viton O-rings

    Viton is a synthetic rubber and fluoropolymer elastomer that is used in O-rings and other molded or extruded products. It offers the best fluid resistance of any commercial rubber. At high temperatures, Viton retains good mechanical properties compared to other elastomers. It remains substantially elastic and is resistant to oils and chemicals at elevated temperatures.
    Last edited by SMO22; 11-18-2019 at 02:03 AM.

  7. #107
    cozzmo81's Avatar
    Join Date
    Aug 2015
    Location
    New Castle, IN
    Posts
    218
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    SMO22,
    Thanks for the information on the differences between Buna-N and Viton. I wasn’t aware of the cold weather differences.


    Sent from my iPhone using ShortWingPipers.Org
    Adam Rhoads

  8. #108

    Join Date
    Feb 2010
    Location
    Eufaula, OK
    Posts
    597
    Post Thanks / Like

    Default Re: PA-22 fuel sending unit gasket

    I needed to replace one of those gaskets several years ago on a PA20. Found one at the National Airplane Parts Association with no minimum order required. I believe it coincidentally fit a Ford.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •