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How to fix muffler?

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Old 12-13-2009, 01:23 AM
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Heyrandy
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Default How to fix muffler?

My Chipmunk had a rough landing and the Bison Pitts muffler took it hard. Can I fix the muffler with a little JB Weld? I heard that JB is not good for vibrating services. Is there something better to use? Thanks.
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Old 12-13-2009, 01:40 AM
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Default RE: How to fix muffler?

In case you are wondering, here is what my Chip looked like right before I damaged the muffler.
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Old 12-13-2009, 08:05 AM
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Default RE: How to fix muffler?

Sorry about the Chipmunk. She was a beauty.

I've tried to JB stingers back onto mufflers before with little or no success. They usually last 2 or 3 flights then come loose. Maybe I wasn't doing it correctly.
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Old 12-13-2009, 08:11 AM
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Default RE: How to fix muffler?

Same thing happened to my Chippy. Although, luckly, it was an easy repair.. Same damage to the muffler. I found a mixable epoxy called "PC epoxy". It's the putty type that you roll together until it is thoroughly mixed. I cleaned both piecs with a wire brush & wiped down with alcohol. I then just worked the epoxy into & around the pipes making a small bead. I let it set for a couple of days & I've had about ten flights on it, no problems yet. I got it at a "Farmer's Supply" but , I'm sure it's availble elseware . Good Luck !!
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Old 12-13-2009, 12:17 PM
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Default RE: How to fix muffler?

How about silver solder?

Bob
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Old 12-13-2009, 04:47 PM
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Default RE: How to fix muffler?

whats it made of ? if its steel silver solder or brass
take it to a radiator shop they can solder it on in a heartbeat for probably a freebie or a few bucks
nice plane sorry for your loss
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Old 12-13-2009, 06:34 PM
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Default RE: How to fix muffler?

Thanks for the ideas. I believe that the muffler and stingers are made of aluminum.

How does the silver solder thing work? I have "silver bearing solder" that I've used on plumbing. Is that the same thing. I also have 60/40, etc. Do I just heat the assembly with my propane torch and sweat the solder into the joint? Any flux (ie acid type)?

Thanks.
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Old 12-13-2009, 06:53 PM
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Default RE: How to fix muffler?

Oh good Lord, cover her up. If you have a blacks smith shop in your area, stop in show it to them, they usually can tell you what it's made of, and can usually fix it for you. Tig weld whatever it takes.
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Old 12-13-2009, 09:29 PM
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Default RE: How to fix muffler?

Heyrandy,

I take back what I said about Silver Solder. I was talking about Stay Brite Silver Solder available from TH. I've used it for control rods and never had a problem. I've never used it on a muffler though.

I just read the instructions on the bottle and it specifically states that it is NOT recommended for aluminum. I doubt that your muffler is steel (which the solder would work on), but a magnet will tell you that.

For anyone who is interested, you can look at Stay Brite at http://www3.towerhobbies.com/cgi-bin...&I=LXFS75&P=ML

Bob
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Old 12-13-2009, 10:18 PM
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Default RE: How to fix muffler?

I had exactly the same thing happen to exactly the same muffler mounted on a super tigre 60 in a Harmon Rocket 3. I've had excellent results using [link=http://www.permatex.com/products/Automotive/adhesives_sealants/epoxies/Permatex_Cold_Weld_Bonding_Compound.htm]Permatex Cold Weld Bonding Compound[/link]. It mixes up like a two part epoxy and sets in 15 minutes, and once set you can even cut theads in this stuff if you want. I've put several hours of flight time on mine since repairing and it hasn't budged. I did email the guy who owns Bisson and he recommended TIG welding but I didn't know anyone who could/would do it for me. The trick is to make sure it's REALLY clean - shine it up with a wire brush or some fine sandpaper before you glue it.
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Old 12-14-2009, 08:37 PM
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Default RE: How to fix muffler?

Just take it to a welding shop. It will be an easy repair for an experienced welder who knows how to fix thin aluminum. It probably would do fine with just some tacks all around and then seal it with the epoxy putty.
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Old 12-20-2009, 01:38 AM
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Default RE: How to fix muffler?

I use a product called "alumiweld" No flux required and it melts at 730 degrees Fahrenheit. Do a google search on "alumiweld" I have some that I bought at harbor freight tools. and ace hardware sells it also.

It is an awesome product, I welded a busted up crankcase with it once and got another year out of an engine.

Here.

http://www.harborfreight.com/cpi/cta...emnumber=44810

It is a little tricky to use, welding aluminum can be hard because it oxidizes almost instantly, just use a stainless steel brush and keep scratching the surface of your muffler with the rod to keep breaking through the oxidation, then it will flow just like solder. and I prefer to use mapp gas instead of propane it burns hotter.
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Old 12-20-2009, 02:22 AM
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Default RE: How to fix muffler?

The Alumiweld from harbor frieght is the only way to fix your muffler. Its extremely easy to use and has like 30000 pounds tensil strength. Staybright and silver solders only work on brass copper and steals. Show us how it turns out when you fix it.

Evan
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Old 12-31-2009, 12:57 AM
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Default RE: How to fix muffler?

Sounds like it is worth a try. Will let you all know later.

Thanks!
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Old 12-31-2009, 03:50 AM
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Default RE: How to fix muffler?

Barbie is a little decapitated. lol
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Old 12-31-2009, 07:29 PM
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Default RE: How to fix muffler?

ive had good sucess with J.B. weld joining the muffler halves on a magnum .52 f.s., not pretty but still together!
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Old 01-08-2010, 02:19 AM
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Heyrandy
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Default RE: How to fix muffler?

I used the Alumiweld rods from Harbor Frieght and a paint can opener tool to scrape the weld flat. Not exactly professional quality but is airtight and seems good enough. I used MAPP gas but maybe a little too hot as the muffler and stingers deformed a bit. I would probably try just propane first next time.

The Alumiweld is cool stuff and will likely find other uses for it. I would suggest practicing with other things first as initially I had huge globs of it on my muffler. Eventually I figured out how to scrape the excess off.

Thanks for the suggestion!
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