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Mercedes-Benz W196 with a 350-3 .049 Engine



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TD .049 Carb body retainer nut.

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TD .049 Carb body retainer nut.

Post  Cribbs74 on Fri Jan 17, 2014 8:09 pm

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
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Re: TD .049 Carb body retainer nut.

Post  Jason_WI on Fri Jan 17, 2014 8:13 pm

Flying in cold weather the Delrin maybe shrunk to where the retainer nut came loose. Unless you are using the aluminum carb body.

Jason
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Re: TD .049 Carb body retainer nut.

Post  Cribbs74 on Fri Jan 17, 2014 8:18 pm

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

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Re: TD .049 Carb body retainer nut.

Post  RknRusty on Fri Jan 17, 2014 9:54 pm

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.

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Re: TD .049 Carb body retainer nut.

Post  Cribbs74 on Fri Jan 17, 2014 10:02 pm

No doubt, timing was perfect. Landing was smooth as well. Even if fuel was dumping out of the venturi!
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Re: TD .049 Carb body retainer nut.

Post  Ken Cook on Sat Jan 18, 2014 5:46 am

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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