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Help finding a leak.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Help finding a leak.

Unread postAuthor: pyrojoe » Sat Sep 16, 2006 11:40 am

I have just finished building my first coaxial pnuematic spudgun. The only problem is that there is a leak in it somewhere and I am not quite sure where. Whenever I pump it up, I can hear air coming out of it, likely near the schrader valve, but I cannot feel the air or see the leak. Can anyone give me any help as to how I can find the leak and how to seal it up once I do find it? Any help will be greatly appreciated.
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Unread postAuthor: Samm » Sat Sep 16, 2006 12:07 pm

Full up the bath tub with water.

Put the gun in the bath fully under water.

And pump :-) See were the air bubbles are coming from :P


Should work :P

-sAMM
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Unread postAuthor: SpudStuff » Sat Sep 16, 2006 12:37 pm

Remove all the threaded parts and give them 5 wraps of teflon tape counter clockwise. If that disn't work try the bathtub.
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Unread postAuthor: jrrdw » Sat Sep 16, 2006 12:50 pm

Or you could fill the cannon up with water, put some pressure in it, since most wont fit in tub, were water comes out theres your leak! If it's coming out the shrader valve it's probly the valve core, you can get them at auto parts store 5 to a pack. Easy fix there.
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Unread postAuthor: Zorrowannabe9 » Sat Sep 16, 2006 4:00 pm

or take an unused spray bottle, fill it with soapy water. Then pressurise your chamber, and spray ur gun. Look for the bubbles.
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Unread postAuthor: Samm » Sat Sep 16, 2006 4:13 pm

If it fits - The bath tub method is the most re-liable or if it doesn't fit, Jrrdw's method should work :P


-Samm
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Last edited by Samm on Sat Sep 16, 2006 6:29 pm, edited 1 time in total.

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Unread postAuthor: ProfessorAmadeus » Sat Sep 16, 2006 5:12 pm

can i see the pictures in and post them in another tread so we can stay on topic. Ok for the spray bottle use soapy water.
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Unread postAuthor: Pwnany » Wed Sep 20, 2006 1:13 am

Just if you hadden't thought of this. If your cannons too big for a bath. Use a pool. :)
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Unread postAuthor: POS » Wed Sep 20, 2006 2:14 am

Or if you are a smoker, take a mouth full of smoke, ans led it out gently on the suspicois part. You should see the smoke getting blown away by the leak
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Unread postAuthor: ProfessorAmadeus » Thu Sep 21, 2006 8:56 pm

What if the wind is blowing?l Just submerge the pressurized tank in some water.
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Insomniac wrote:Hey why am I a goose???? Why not somthing a little more awe inspireing, like an eagle or something? LOL

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Unread postAuthor: POS » Fri Sep 22, 2006 9:50 am

What if you're out of water.

If the sky drop's the bird die.

Of course you use the smoke methode inside. :roll:

:wink:
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