problem with muffler bolt/gasket

[Felony44]

I have a OS 50 and the gasket has been leaking i was told to remove the gasket and use copper RTV. well i did and i used blue thread lock and while flying today i had the muffler work loose. Does anyone have any suggestions? Should i use red thread lock? I have been told to get a long m3 screw and a nut and place a nut on the end problem there is i cant find a long enough m3 bolt anywhere and it requires you to machine the muffler so the nuts sits flat. Is there a better way to fix this problem?

thanks

[playfair]

Most people don't use a muffler gasket, many don't RTV either.
Threadlock doesn't work to well in that location, so you can try tightening it more.
Eventually the aluminum threads will strip out, the nuts on the end work best.
The LHS should carry bolts long enough, and filing the flange flat isn't a big deal.

[Crash Gordon]

I just saw this in a magazine the other day, but since I can't find it right now I have to just guess about what they said... I believe that they said to get some strong wire that will fit in the bolt holes, run it through then start to twist it up until it is really tight., cut off the ends if you don't twist till the wire breaks.

I apologize if I am WAY wrong about this, I'm a total noob and can't find the article.

[flyinfool]

Use a lock washer under the bolt head.
I use JB Weld or if in a hurry at the field, 5-minute epoxy, to seal the muffler to the engine and never have them come loose.
The muffler will still come off easy when you want it to.

[BarracudaHockey]

I can tell you what works for me and thats no gasket or RTV. RTV, if you over do it can break loose and get sucked back into the engine, it will immediately extinguish your glow plug, usually at the worst possible moment.

If you bolt it up tight, fly it for a bit and snug the bolts as long as the mating surfaces are true you should be fine.

As you found out, locktite liqufies in the heat environment of a header.

[Felony44]

Hey Barracuda are you using the lock washers under the head too?i figure i can try it your way first and also are you using nuts on the end or no.