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Old 01-23-2012, 06:03 AM
Danny-II is offline
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Gettin' Lower!
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Muffler keeps coming loose!

Hi All,

Anyone else had this problem and got a solution to fix it?

Prob is I have crrcpro 55cc engine with a pitts wrap around muffler & what
happens is after 3-4 flights, the bolts come loose.

Using hex bolts with lock tight and it still happens. Everything has been checked
for any balance issues and all is good in that area.

Any solutions welcomed.

Cheers Danny-II
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Old 01-23-2012, 07:41 AM
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Know God,no fear!
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United States, TX, Tyler
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Try this.Remove bolts and clean bolt and hole threads with carb cleaner,reinstall with high strenght loctite(red) and lock washers,immediately start motor and run until at operating temperature,about 3-5 minutes,kill motor and retighten bolts,then let it sit so the loctite sets up.
Jeff Sikes
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Old 01-23-2012, 07:51 AM
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Check it bleed,bro was on.
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United States, VA, Hampton
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+1 on the red loctite.
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Old 01-23-2012, 07:57 AM
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Also, make sure that the wrap around muffler has a metal brace that extends from the muffler back to one of your head bolts. Those mufflers can vibrate the bolts loose and even crack the mufflers if they aren't braced properly.
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Old 01-23-2012, 09:38 AM
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Multi Platform Pilot
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United States, FL, Jacksonville
Joined Dec 2007
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Hmm...we use heat to remove lockite, even red.

680 red is the high temp stuff if you must.

Cleaning the bolts, lock washers, and snugging the bolts (dont ham fist them or you will just remove the "spring" from the bolts) when its warm and they should be fine.
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Old 01-23-2012, 09:52 AM
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Just Here For The Comments
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Joined Mar 2007
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Remove muffler, clean bolts and threads, put a dab of Permatex Ultra Copper on the bolts. Let it set up for 10 or 15 minutes then bolt the muffler on. After trying different kinds of loctite, running motor to get the temp up and retorquing, etc., the Ultra Copper has been the one thing that has worked. Several motors later, one time application and tighten one time, I've yet to have a muffler come loose. It's made for high temp. I use a thin film of it as a muffler gasket as well. It's good stuff!
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Old 01-23-2012, 09:56 AM
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Eddy Johnson
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Rowlett, Texas
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make a strap to support the other side of the muffler to the firewall or preferably to the engine. this muffler comes with a strap do it like this

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Old 01-23-2012, 10:00 AM
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Eddy Johnson
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Rowlett, Texas
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Also make sure your prop is balanced and the engine is tuned properly of you will not keep a muffler on it!! if it has loosened your threads you might have to heli coil them for proper tighting.. good luck its a pain. you can also drill holes in your hex head screws and run some bailing wire through them to each other so they canot come loose.
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Old 01-23-2012, 11:37 AM
parpar1 is offline
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Fast can be bad
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Garden Grove, CA
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Dang did we not just have this same thread come thru two weeks ago. ALmost word for word. Just saying.

There was a lot of great advice on that one. i am just to lazy to search and find it for you this morning. Anyone ???

Update;;;;;;;;; i guess i am not too lazy after all

Found it https://www.flyinggiants.com/forums/...+muffler+loose
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Old 01-23-2012, 04:21 PM
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Danny, do away with the gasket that came with your engine. They tend to compress leaving the bolts succeptible to getting lose.
Instead, wipe a thin layer of high-temp silicone on both flanges.
Clean the bolts with metho, acetone or siimilar solvent and put a few drops of red locktite on them.
Tighten well and they shouldn't come out.
Obviously and like has been mentioned earlier in the thread, you need to support the can of the muffler. I often use the old fashioned curtain springs by wrapping the spring around the outer end of the can a couple of turns and then anchor it to the firewall or better still, to the engine mounting bolts if that is easier
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Old 01-23-2012, 04:48 PM
theKM is offline
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needs more yaw authority
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Nord locks... they're fun too
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Old 01-23-2012, 05:18 PM
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Quote:
Originally Posted by theKM View Post
Nord locks... they're fun too
Nerd locks?
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Old 01-23-2012, 05:41 PM
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Don't you need a left handed metric crescent wrench to install Nordlocks?
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Old 01-23-2012, 08:05 PM
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would rather be flying..
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drill the bolt heads through the side and lock wire them...
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Last edited by timbo0279; 02-28-2013 at 09:19 PM.
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Old 01-23-2012, 09:00 PM
CEThomas is offline
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My life needs editing.
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United States, OH, Amanda
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Teflon tape (Plumbers tape) Old engine guy gave me the tip in 97 when I had a Q-52 that could not keep the bolts in. Used it ever since on everything for 40cc to 150cc engines and never had a bolt come lose
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