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ezflyr
02-28-2018, 10:19 AM
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.

55-PA18A
02-28-2018, 10:45 AM
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

tempdoug
02-28-2018, 11:35 AM
show us a picture.

SchulerJL
02-28-2018, 12:25 PM
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

mvivion
02-28-2018, 12:29 PM
Give Randy a call, outstanding work on Carb Air boxes

RANDY RUBBERT AIRCRAFT MAINTENANCE AND REPAIRReynolds, North Dakota

(701) 847-3008 (tel:(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

hotrod180
02-28-2018, 12:34 PM
A buddy of mine sent his C180 airbox to FA Dodge years ago,
came back looking *better than new*.
But $$$$$$$$$.

aktango58
02-28-2018, 12:39 PM
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'.

Marty57
02-28-2018, 02:50 PM
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

hotrod180
03-01-2018, 01:19 PM
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.

algonquin
03-01-2018, 05:58 PM
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.

WhiskeyMike
03-02-2018, 10:39 PM
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.

Sepp P.
05-25-2018, 01:53 PM
Agreed.

RaisedByWolves
05-25-2018, 07:48 PM
https://uploads.tapatalk-cdn.com/20180526/6bdab9f413212a49dd937946f57bfa36.jpg

Broke right where the reinforcing plate stoped. Got an almost new one the next day from the Hampton fly mart. Perfect timing


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flyrite
05-26-2018, 10:39 AM
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.

Eferr
05-19-2020, 04:27 PM
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


48894


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Cub Special Ed
05-19-2020, 08:08 PM
Just had mine worked on by ted miller at black hills areo in spearfish sd.

jrussl
05-20-2020, 10:19 AM
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

flyrite
05-20-2020, 10:34 AM
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.

12Geezer2
05-20-2020, 11:06 AM
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

Eferr
09-21-2020, 07:32 PM
Soooo, I ended up sticking a rubber grommet in there. It fits like an f-ing glove and Iím gonna go ahead and call it a win at $0.15 fix. Figure Iíll have to be proactive and change it out in a couple years. I mean, whatís the worst that could happen?


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mvivion
09-21-2020, 09:56 PM
Soooo, I ended up sticking a rubber grommet in there. It fits like an f-ing glove and I’m gonna go ahead and call it a win at $0.15 fix. Figure I’ll have to be proactive and change it out in a couple years. I mean, what’s the worst that could happen?


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The engine could eat that O-Ring....or maybe something more important.

MTV

windy
09-21-2020, 10:21 PM
You can get brass bushings from McMaster Carr Aero that would be better than a rubber grommet that could get sucked into the engine


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tempdoug
09-21-2020, 10:36 PM
Soooo, I ended up sticking a rubber grommet in there. It fits like an f-ing glove and I’m gonna go ahead and call it a win at $0.15 fix. Figure I’ll have to be proactive and change it out in a couple years. I mean, what’s the worst that could happen?

rivet one of these bearings on before a oring.
Sent from my iPhone using SuperCub.Orghttps://www.aircraftspruce.com/catalog/eppages/economycarbrepairkit.php?clickkey=44327

skywagon8a
09-22-2020, 05:36 AM
Soooo, I ended up sticking a rubber grommet in there. It fits like an f-ing glove and Iím gonna go ahead and call it a win at $0.15 fix. Figure Iíll have to be proactive and change it out in a couple years. I mean, whatís the worst that could happen?
The air box is subject to all of the vibrations an engine can generate which is why they wear out. You do not want to risk doing anything with something which could work it's way loose. If something as small as a screw or nut gets sucked into the engine, you will be extremely lucky if it just blows through and out the exhaust. It could get stuck under a valve or bounce around between the piston and cylinder head. If it jams an intake valve open, the engine could stop RIGHT NOW ! Just one intake valve being open can stop an engine. Been there, done that, in a Comanche.

Your rubber grommet could get stuck under a valve.

Steve Pierce
09-22-2020, 07:06 AM
The Continental box repair kit fits the Lycoming. I would be concerned about sucking that grommet into the engine. Should be able to braze a bushing in there.

Eferr
10-05-2020, 01:16 PM
The Continental box repair kit fits the Lycoming. I would be concerned about sucking that grommet into the engine. Should be able to braze a bushing in there.


Ordered the o-300 repair solution. Hereís what The grommet looks like. It is a perfect fit, but the point is well taken.

51441


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