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put more oil on it to make it solid black
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How do you remove burnt oil from a 4-stroke muffler ?

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Old 01-09-2004, 12:32 PM
  #1
Flyboy Dave
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Default How do you remove burnt oil from a 4-stroke muffler ?

I tried the crockpot/anti freeze method before....

....it didn't even touch the really burnt on stuff. []

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Old 01-09-2004, 01:10 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

Have you tried just a soft brass wire brush? Most other cleaners will discolor the aluminum when used, but you could try carburator cteaner and the wire brush. May remove some more of the gunk. [&:]
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Old 01-09-2004, 01:11 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

All of the above! I gave a few to my nephew-in-law and he glass bead blasted 'em for me. Also sand blasted some myself w/ fine sand @ low pressure. Then I ultra sonic cleaned 'em in alcohol to get the grit out. I think wire wheelin' them works good too, If you don't mind the finish it leaves on 'em...I had this blue liquid for cleaning jewlery that smelled like that home permanant stuff my sis used to use, that came w/ the sonic cleaner, but I can't find it anymore. That stuff would take anything off, inc. rust, but it would leave a gray dis-coloration on alum. parts.
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Old 01-09-2004, 01:16 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

Can I ask what kind of fuel you used? Synth oil or castor based?

Some folks at our field say there is a new cleaner from Dawn called "Power Dissolver" that will dissolve this baked on oil when left on overnight. The cleaner is designed for the stove but is a simple Detergent based cleaner with a higher than normal lye amount (but doesn't seem to be enough to react with the aluminum). I have no personal experience with it let but the cleaner cost about $3.00 a bottle at Target.
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Old 01-09-2004, 01:27 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

I don't try to remove the stains on the fourstroke mufflers, but I do use fuel.
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Old 01-09-2004, 01:32 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

Quote:
ORIGINAL: hobbsy

I don't.
You don't use fuel?
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Old 01-09-2004, 01:39 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

Get some Low Odor Aircraft Stripper for aluminum. Auto Zone has it.

It is goopy. Best way I have found to use it is slop it on over all areas you wish to clean and let it sit for half an hour. I have an old saucepan for the part(s) to sit in. Then use a wire brush to scrub the gunk off.

Wear rubber kitchen gloves; this stuff is caustic.

.
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Old 01-09-2004, 02:21 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

if you know someone who reloads ammunition they probably have a case tumbler. that might work.
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Old 01-09-2004, 04:23 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

I think the best way to keep it to a minimum is to wipe off the muffler and header (if possible) after each flight and not use castor based fuels. Secondly periodically remove the muffler and header and soak in Chevron Perfect Engine Cleaner which seems to work well enough for me or you can try Demon Clean or Z Best but the key is to do this before the muffler and header get too gunked up. I know this seems lke a lot of work but just look at it like a regular maintenance item. Also consider using the "Yellow" teflon plumbers tape for sealing all joints in the exhaust system as keeping leaks to a minimum helps a great deal to reduce the baked on gunk problem.
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Old 01-09-2004, 04:26 PM
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Default RE: How do you remove burnt oil from a 4-stroke muffler ?

So this brown baked on stuff is mostly coked castor and not burnt synth oil?
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