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Help I am having trouble removing the muffler from my .049 Dragon Fly

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Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Blue Eyes on Mon Apr 14, 2014 7:45 pm

I removed the cylinder. And I removed the clip from the muffler. Should the muffler slide off of the Cylinder?
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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  microflitedude on Mon Apr 14, 2014 8:53 pm

Yes, the muffler should freely rotate and slide down off the cylinder. If it's gummed up you will need to soak it in a solvent to soften the hardened oil. If it's not too bad you might could get away with just using a heat gun to warm it up.
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RE Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Blue Eyes on Mon Apr 14, 2014 10:34 pm

Than you. I am soaking it i alcohol over night. I will check it tomorrow.
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re: soaking in alcohol

Post  happydad on Tue Apr 15, 2014 12:45 am

Blue Eyes wrote:Than you. I am soaking it i alcohol over night. I will check it tomorrow.

what type of alcohol? isopropyl alcohol is mostly water and can corrode the engine parts. i use old fuel. fuel is only good for so many years then the nitro starts to loose it's potency.

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Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Blue Eyes on Wed Apr 16, 2014 10:09 pm

It was isopropyl alcohol. now it soaking in fuel. How long do you the cylinder and muffler soak.
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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Cribbs74 on Wed Apr 16, 2014 10:32 pm

Do you have a heat source? Perhaps a heat gun or maybe a propane torch?

Hit it with a little heat and slide it off. Soaking will work if you want to wait a while. Heat works in seconds.
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re: soaking in fuel

Post  happydad on Wed Apr 16, 2014 10:56 pm

Blue Eyes wrote:It was isopropyl alcohol. now it soaking in fuel. How long do you the cylinder and muffler soak.

I usually soak in fuel for at least over night, then twist and turn the components, muffler, to see if it is loose. if it isn't loose I use an old tooth brush on the areas between muffler and cylinder. NOTE: I ALWAYS use rubber gloves. I paid $5.00 for a box of 500 at Harbour Freight Tools, a local place to buy cheap tools. Note I said cheap, not quality. Some tools are good for many years and some breakdown soon. You get what you pay for.

p.s. I just received a Cox Medallion .049 today and I need to start the same process of cleaning and checking tolerances.

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Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Blue Eyes on Thu Apr 17, 2014 1:49 am

Thank you. I tried lighting a piece of wood and tried that it did not work, apparently that was not hot enough.
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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Oldenginerod on Thu Apr 17, 2014 6:28 am

Just try putting the cylinder and muffler into an oven set at around 250. Leave it there for 1/2 and hour or so, remove it with leather gloves and give the muffler a twist. I don't see why it would be too difficult, but some times old caster oil can be stubborn.

Cheers.

Rod.
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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  RknRusty on Thu Apr 17, 2014 7:46 am

Blue Eyes wrote:Thank you. I tried lighting a piece of wood and tried that it did not work, apparently that was not hot enough.
No, that was probably only 450 f degrees or so. A heat gun will get up to as much as 1100 degrees f.

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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  crankbndr on Thu Apr 17, 2014 8:19 am

I've been chastised for it before but I find an easy way to add heat is to drop the engine in hot water. I heat water in a coffee cup in the micro to boiling, drop in the engine and let it soak for 10
min. Works every time.
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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  ian1954 on Thu Apr 17, 2014 8:26 am

Providing there is no plastic, delrin or rubber on the engine. I put them in a pan and boil them. As long as dried afterwards and oiled there should be no problem.

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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  jsesere on Thu Apr 17, 2014 4:11 pm

Go to the local thrift shop or Goodwill and buy a $5.00 blow dryer. Heat is the way to go.
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RE Help I am having trouble removing the muffler from my .049 Dragon Fly

Post  Blue Eyes on Thu Apr 17, 2014 4:26 pm

I finally got the muffler off the cylinder. What I did was to use a candle liter three times. I know that open flame is very very dangerous but i was very very very very careful. I used the candle liter away from the fuel.  Very Happy 
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Re: Help I am having trouble removing the muffler from my .049 Dragon Fly

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