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XHELI.COM . Autography FlightPower . Advantage Hobby

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Century Hawk - Falcon - Raven - Predator > Century Muffler Question
 
 
Donald D.
Heliman
Location: Stevens Point Wisconsin

Last evening while flying, I noticed exhaust coming out the bottom of my Century CN3033A muffler. After closer inspection, the bolt that plugs the extra pressure fitting hole was missing. I went through all my metric and standard bolts, and none of them fit. Does anyone know what thread size that bolt is. I am thinking of maybe just threading a bolt close to its size into the hole and using some JB weld to hold it in. Any suggestions?
Thanks
Don
09-19-2002 Over year old.
 
 
Century Heli
Senior Heliman
Location: CA. USA

Size is 4mm metric bolt, you should can get it from hardware store.
09-19-2002 Over year old.
 
 
Donald D.
Heliman
Location: Stevens Point Wisconsin

Office, you are correct in the fact that it is 4mm, but the thread is different than the 4mm bolts I have laying around [blade mounting bolts for main rotor blades]. Is there such a thing as 4 mm fine thread? The threads are still good, and my first choice is to find a bolt to fit in the hole, but if I can't, I will have to force one in and JB weld it in. When you JB weld them in, do they fall out from vibration later on?
Thanks
Don
09-19-2002 Over year old.
 
 
Jeff H
Key Veteran
Location: Cincinnati, OH

Could be American threads 4-40, or 6-32 maybe?
09-19-2002 Over year old.
 
 
Donald D.
Heliman
Location: Stevens Point Wisconsin

No, I checked all the American standard threads against it, and although it is a bit smaller than 8-32, there is no match with any American thread. The 4 mm bolt looks right for size, but the thread is finer than the standard 4 mm bolts that come with our machines. What a puzzler this is turning into. I am going to my local hardware store to see if maybe there is a different thread in metric like there is in American bolts.
Don
09-19-2002 Over year old.
 
 
Donald D.
Heliman
Location: Stevens Point Wisconsin

Mystery Solved
It was a 4 mm bolt that fits in the pressure tap, it seems that the one I was using as a reference was a little chewed up, and even though the 4 mm nut would screw on the bolt, the bolt would not screw into the muffler hole. Thanks to all who helped here, now I can get back to flying.
Don
09-19-2002 Over year old.
 
 
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Century Hawk - Falcon - Raven - Predator > Century Muffler Question
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