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by HalfaDave Wed Apr 17, 2024 7:28 pm
Cox Engine of The Month
TD .049 Carb body retainer nut.
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TD .049 Carb body retainer nut.
Weird thing happened to me, I was flying this evening and at the top of a F8 outside loop the engine locked up. As I was gliding down I watched fuel dumping out of the venturi so I knew it had fuel. I was thinking broken crank or rod.
Turned out the carb body retaining nut worked it's way loose and jammed up the driveplate.
A few mins later I was in the air again, but I wanted to relay the story. I never check the tightness on that thing and now maybe I will!
Ron
Turned out the carb body retaining nut worked it's way loose and jammed up the driveplate.
A few mins later I was in the air again, but I wanted to relay the story. I never check the tightness on that thing and now maybe I will!
Ron
Cribbs74- Moderator
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Posts : 11895
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: TD .049 Carb body retainer nut.
Flying in cold weather the Delrin maybe shrunk to where the retainer nut came loose. Unless you are using the aluminum carb body.
Jason
Jason
Jason_WI- Top Poster
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Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: TD .049 Carb body retainer nut.
Possibly, it was in the high 40's though. I did fly in the 30's a while back so maybe it happened then and slowly loosened today. Scared the crap out of me.
Besides the tach race engine I have never broken a Cox.
Ron
Besides the tach race engine I have never broken a Cox.
Ron
Cribbs74- Moderator
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Posts : 11895
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: TD .049 Carb body retainer nut.
Hmmm, guess I'll check mine next time I fly. I'm glad it quit in a position where it had enough momentum to glide in for a landing.
Rusty
Rusty
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Re: TD .049 Carb body retainer nut.
No doubt, timing was perfect. Landing was smooth as well. Even if fuel was dumping out of the venturi!
Cribbs74- Moderator
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Posts : 11895
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Re: TD .049 Carb body retainer nut.
Ron, this happens a bit. I've had it happen several times. It certainly sounds like the engine seized. I've use Teflon tape to stop that from happening as I had one that would do it frequently. I lapped the collet down a bit so that the crank projected a few thou in front of it. I believe the phenolic washer on mine was grabbing the collet and loosening it. Ken
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