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Float doesn't

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sun Sep 20, 2009 9:13 am Post subject: Float doesn't

I had a customer called several weeks ago saying his engine felt 'weird' on a landing, kind of like it wanted to stall.  As he rolled out onto the taxiway, the engine felt normal.  We made an appointment to check it out, and left it at that.  The next few flights were about the same.  He didn't worry much about the engine.   

 

  A couple of weeks ago (oh, he never did come down to have it checked out) he called saying it was worse.  

  

 

  Note:  He has a Cheetah.  Several years ago I had a customer with the same symptoms with his Cheetah and it was the mixture needle working it's way out.  

  

 

  I had him check the mixture screw and turn it in a 1/4 turn and said to bring it in.  He planned to bring it in but never did.  The engine 'felt' better.  

  

 

  Last week, he called saying it was getting a lot worse.  He said it barely ran at idle.  He finally brought it in last Friday.  

  

 

  I looked for all of the basic stuff, leaks at the intake tubes, mixture screw, looked for leaks on the carb . . . . nothing.  We removed the cowling and airbox.  Several years ago, the accelerator nozzle in the carb on my Cheetah had fallen out and was lying in the bottom of the airbox.  I expected to find something like that.  Nothing.  Venturi was tight, accelerator nozzle was tight . . .  nothing.  I removed the carb.

  

 

  I expected to find debris in the bottom of the carb.  Nothing.  Then I noticed one of the semi-transparent floats was full, I mean full, of fuel.  These are the white floats.  They should have been changed.  Except that, the carb had been overhauled in 2005.  All new parts.  

  

 

  Carb goes to Ken, at Lycon, in the morning.

  [quote][b]

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Gary
AuCountry Aviation
Home of Team Grumman

jetinc(at)comcast.net
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Posted: Sun Sep 20, 2009 9:23 am Post subject: Float doesn't

Gary,



Wish I was still flying and you were working on my plane.  Your knowledge of these planes saves owners a ton of money.  Way to go Gear Head!

Eddie

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sun Sep 20, 2009 9:46 am Post subject: Float doesn't

Hey Eddie, I know of a couple of project planes.  What a project?

 

 

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Gary
AuCountry Aviation
Home of Team Grumman

jetinc(at)comcast.net
Guest

Posted: Sun Sep 20, 2009 9:49 am Post subject: Float doesn't

I think I need another project like I need another Kid!  Can't wait to come up and see you...



Eddie

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sun Sep 20, 2009 10:05 am Post subject: Float doesn't

Come on up and help with the remodeling of my Condo.

 

 

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Gary
AuCountry Aviation
Home of Team Grumman

jetinc(at)comcast.net
Guest

Posted: Sun Sep 20, 2009 10:17 am Post subject: Float doesn't

roger, wilco!

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flyv35b(at)minetfiber.com
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Posted: Sun Sep 20, 2009 1:38 pm Post subject: Float doesn't

Gary, after our phone conversation Friday about this,  it doesn't surprise me.  The float was sinking, raising the fuel level and  making it run very rich.  Probably could have diagnosed it by leaning the  mixture manually until it smoothed out and that would have told you it was to  rich (20/20 hindsight, right?).

  

 Cliff

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Thu Sep 24, 2009 10:22 am Post subject: Float doesn't

Floats in carburetors have been around for over 100 years.  It amazes me how carbs in cars have managed to avoid recalls every couple of years to fix a problem with floats.  Why not have Holley, Edelbrock, Carter or General Motors build the floats?   It's not like GM doesn't need the work.  

 

 

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Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)minetfiber.com
Guest

Posted: Thu Sep 24, 2009 11:19 am Post subject: Float doesn't

Oh, come on Gary,  you are being way to  practical!!

  

 Cliff

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