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Thread: Carb Airbox Repair....

  1. #1

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    Carb Airbox Repair....

    Hi All,

    I'm slowly picking away at some issues discovered with my newly acquired J-3 Cub. I decided to pull the carb. and send it to Uni-Tech for rebuild as it seemed to be leaking fuel on the hangar floor not related to the primer. Anyway, after removing the airbox, I found that the shaft is very sloppy due to wear. I see that Wag Aero has a rebuild kit that adds riveted end plates holding bearing and a new shaft. What I don't get is that the butterfly in my existing box is brazed to the shaft and cannot be (easily) removed. How are you supposed to attach a butterfly to the shaft included in the rebuild kit? Any other ideas for fixing my current airbox?

    Thanks!

    John M.

  2. #2
    55-PA18A's Avatar
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    Not familiar with a J-3 air box and how it might be different from an 18's air box, but isn't the butterfly just a piece of metal? Make a new one. Or, send to Atlee Dodge in Anchorage. They used to rebuild air boxes. Maybe they still do.

    Jim
    Likes mike mcs repair liked this post

  3. #3

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    show us a picture.

  4. #4
    SchulerJL's Avatar
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    Give Randy a call, outstanding work on Carb Air boxes

    RANDY RUBBERT AIRCRAFT MAINTENANCE AND REPAIRReynolds, North Dakota


    (701) 847-3008
    1850 2nd Ave NeReynolds, ND 58275-9477

    Likes phdigger123 liked this post

  5. #5
    mvivion's Avatar
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    Quote Originally Posted by SchulerJL View Post
    Give Randy a call, outstanding work on Carb Air boxes

    RANDY RUBBERT AIRCRAFT MAINTENANCE AND REPAIRReynolds, North Dakota


    (701) 847-3008
    1850 2nd Ave NeReynolds, ND 58275-9477

    Randy does fantastic repairs on air boxes. Would be my first, second and third choice.

    MTV
    Likes 12Geezer2 liked this post

  6. #6
    hotrod180's Avatar
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    A buddy of mine sent his C180 airbox to FA Dodge years ago,
    came back looking *better than new*.
    But $$$$$$$$$.
    Cessna Skywagon-- accept no substitute!

  7. #7
    aktango58's Avatar
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    Air box and tailwheel...

    What does Bill Duncan say about tailwheels: they get ignored until they are gone.

    The importance of it, and the limited care they get for an often flimsy pice of metal, not hard to have them come back 'better than new'.
    I don't know where you've been me lad, but I see you won first Prize!

  8. #8
    Marty57's Avatar
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    Give Lycon in Visalia Ca a call and see if they have what you need. When they showed me around last year, they had a pallet box full of air boxes they received when they bought out Greek AF inventory. They told be they would sell the air boxes if some one needed the parts and to give them a call.
    Marty
    N367PS
    Psalm 36:7 "High and low among men find refuge in the shadow of His wing"
    www.marty2plus2.com

  9. #9
    hotrod180's Avatar
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    I think Wag or Spruce or Univair sells complete airbox assemblies.
    Dunno if PMA'd or not.
    I kinda recall they were similar if not identical to my old C170 airbox.
    Cessna Skywagon-- accept no substitute!

  10. #10
    algonquin's Avatar
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    If the box for the C-180 was for a 53 or 54 they are very special and have a SS plate. I understand only one company makes the part and a new airbox is around $10,000.00 or so I've been told. This is second hand infro. So take it for what it is.
    Likes 180Marty liked this post

  11. #11
    WhiskeyMike's Avatar
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    There are very specific requirements about the rivets and placement in air boxes. If it falls apart, the engine can easily quit. Use a good, reputable rebuilder.

  12. #12

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    Agreed.

  13. #13
    RaisedByWolves's Avatar
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    Broke right where the reinforcing plate stoped. Got an almost new one the next day from the Hampton fly mart. Perfect timing


    Sent from my iPhone using Tapatalk

  14. #14
    flyrite's Avatar
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    Quote Originally Posted by ezflyr View Post
    Hi All,

    I'm slowly picking away at some issues discovered with my newly acquired J-3 Cub. I decided to pull the carb. and send it to Uni-Tech for rebuild as it seemed to be leaking fuel on the hangar floor not related to the primer. Anyway, after removing the airbox, I found that the shaft is very sloppy due to wear. I see that Wag Aero has a rebuild kit that adds riveted end plates holding bearing and a new shaft. What I don't get is that the butterfly in my existing box is brazed to the shaft and cannot be (easily) removed. How are you supposed to attach a butterfly to the shaft included in the rebuild kit? Any other ideas for fixing my current airbox?

    Thanks!

    John M.

    John, just did the rebuild with the kit that you referenced. Not a hard job at all ,you will need to grind the brazing from the butterfly that attaches it to the bolt . As well as grind off the ends on the outside of the box that the bolt goes through , you won't need those anymore.

  15. #15

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    Carb Airbox Repair....

    Hoping to revive this. I seem to have lost a bearing on my carb airbox. I know there are repair kits for continentals, curious if I could just buy a kit and jimmy-rig the bearing onto the shaft of mine


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  16. #16
    Cub Special Ed's Avatar
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    Just had mine worked on by ted miller at black hills areo in spearfish sd.
    "There are 3 kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." Will Rogers

  17. #17
    jrussl's Avatar
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    Check with Randy Rubbert.

    He or his son Logan did mine and it came back looking like new.

    RANDY RUBBERT AIRCRAFT MAINTENANCE AND REPAIR
    (701) 847-3008
    1850 2nd Ave Ne
    Reynolds, ND 58275-9477

    As others have said, don't skimp on the airbox. Ingesting a piece of it into the engine might ruin your day.

    Jeff

  18. #18
    flyrite's Avatar
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    when you order a rebuild kit, it will come with two new bearings. The only part that is a little bit tough, is grinding the brazening loose from the rotating arm And then re-tac’n it backup inside the box itself everything else is very easy.

  19. #19
    12Geezer2's Avatar
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    Quote Originally Posted by jrussl View Post
    Check with Randy Rubbert.

    He or his son Logan did mine and it came back looking like new.

    RANDY RUBBERT AIRCRAFT MAINTENANCE AND REPAIR
    (701) 847-3008
    1850 2nd Ave Ne
    Reynolds, ND 58275-9477

    As others have said, don't skimp on the airbox. Ingesting a piece of it into the engine might ruin your day.

    Jeff
    Yes indeed---The Rubberts have YEARS of experience and really do an excellent job.---geezer Dan

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