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Author Topic: Leak detection  (Read 3309 times)
RichardEntrekin
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« on: December 19, 2008, 09:17:34 AM »

One of the recent threads about finding leaks with soapy water started me thinking and that's a dangerous thing. My Newell, and most Newells have the same issues. I have used gallons of soapy water, but cannot find all the leaks.

What are you're thoughts on pressurizing the air system with R-134a and using a leak detector?

Has anyone ever done anything like this, or used an alternate method besides the soapy water?

My thought process is that if I am not finding it with the soapy water, then it is a leak I cannot see. Using a leak detector may get me close to the source.

Would love to know your thoughts.
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Richard Entrekin
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John316
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« Reply #1 on: December 19, 2008, 11:46:42 AM »

Richard,

I am looking forward to the responses. I was the one who said that I have used a ton of soapy water...To little avail so far. But I will start again when it warms up.

God bless,

John
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jjrbus
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« Reply #2 on: December 19, 2008, 12:20:11 PM »

 Somewhere out there in Google search land is a detector for air leaks. It is a small hand held device which detects leaks by sound.

                                                                                                                          Jim
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Len Silva
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« Reply #3 on: December 19, 2008, 12:26:43 PM »

I don't see why it wouldn't work.  In the "old days", we tested waveguide by filling it with freon at 3-5 psi and we could find leaks 250 feet up a tower with a "squealer".
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Utahclaimjumper
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« Reply #4 on: December 19, 2008, 02:26:18 PM »

I would be concerned that the oil in R-134A would attack the air lines from within and cause a failure, some one on the board may know the makeup of R-134A,,,,Nick??   >>>Dan
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Utahclaimjumper 
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Will & Wife
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« Reply #5 on: December 19, 2008, 05:53:42 PM »

I'm with John316 on this. Can't wait for the responses Grin Everytime it rains soap suds drifts out from beneath the bus LOL Grin How about connecting an LP tank to the air system and just sniffing around for the gas leaks Shocked Shocked Maybe use just a really small cigarette lighter and look for a really small flame? Roll Eyes Don't want any big flames under the bus, you know Huh Sorry, now I'm just being fecetious Wink
Seriously, though, does anyone know of anything that can be put in the air system to make it easier to find leaks? I definitely like the idea! Grin Grin Thanks, Will
« Last Edit: December 19, 2008, 05:55:14 PM by PP » Logged

DSweet
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« Reply #6 on: December 19, 2008, 08:39:13 PM »

Just thought, there is a product on the market for checking for gas leaks,
I bought some from a local Ace hardware store, it bubbles but tiny bubbles,
it seems to locate very small leaks.  It works for me.
Blessings,
David
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Sojourner
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« Reply #7 on: December 19, 2008, 09:39:11 PM »

All my leak check is done with cap full of dishwashing liquid and water in spray bottle. Compress air in line and spray all joints until a bubble shows. Large leaks...large bubbles. Very small leaks... very tiny white bubbles that grow to a gob after a few minutes.

After all leaks been check & repaired...vacuum with strong a/c oil bath vacuum pump to nearly 30 inch of mercury. You can never reach 30 inch of mercury which is perfect vacuum. No leaks in the system if hold steady for 30 minutes.

Read the paragraph of A little more on moisture removal (left click)
Water boil at 10F when vacuumize to 29.86 inch of mercury at sea level.

FWIW

Sojourn for Christ, Gerald
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blue_goose
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« Reply #8 on: December 20, 2008, 05:34:31 AM »

They do make electronic air leak detectors.  I will bring mine to Jacks rally if anyone would like to use it.  They can be a hard to find even with the electronic detector. 
Been trying to find all mine for over 20 years and I don't even have air bags.
Jack
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JackConrad
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« Reply #9 on: December 20, 2008, 05:39:06 AM »

I always have our electronic leak detector in our bus also, if anyone wants to try using it at Bussin' 09.  Jack
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wrench
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« Reply #10 on: December 20, 2008, 05:54:09 AM »

  I use this stuff for all my leak problem, & work gooooooooood because it don't run away easy:
 http://www.ackits.com/c/bigblu/Big+Blu+Liquid+Leak+Detector.html
         wrench
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Len Silva
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« Reply #11 on: December 20, 2008, 06:41:18 AM »

I was just thinking (ouch!) that if you let the bus completely run down so all the bags are deflated, then introduce R-134 as a gas into the compressor intake with the bus running, that it would get into every part of the air system with on oil introduced.  A leak detector might work quite well after all the gas has dissipated from around the compressor.

FWIW
Len
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wrench
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« Reply #12 on: December 20, 2008, 02:46:18 PM »

  OK, the race to hallucination is open!!   I favor a smoke bomb(like the skydiver use) & along with Len idea having the smoke sniff by the compressor should allow to video the leak!! (future information bank).
        wrench
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Len Silva
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« Reply #13 on: December 20, 2008, 06:27:32 PM »

Well now you're just blowing smoke Roll Eyes
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Busted Knuckle
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« Reply #14 on: December 21, 2008, 06:17:05 AM »

I was just thinking (ouch!) that if you let the bus completely run down so all the bags are deflated, then introduce R-134 as a gas into the compressor intake with the bus running, that it would get into every part of the air system with on oil introduced.  A leak detector might work quite well after all the gas has dissipated from around the compressor.

FWIW
Len

Len most of the guys I know who are GREAT at working on bus A/C systems use dry nitrogen to test for leaks because it is # 1 cheaper by far than 134, # 2 it is safer than 134 as it is a dry and "neutral" gas, which will not create problems with other types of gas, #3 they can charge it up to a fairly high pressure without having to run the system and still use a "sniffer" to detect leaks quickly and accurately!
Now with that said I have not heard of any of them trying this on a regular air system, but I guess it could work!

I always use the liquid bubble stuff sold in the toy department for kids to use for blowing bubbles. I put it in a spray bottle, and then I spray and spray away while the system is hooked to shop air! Once the bubble stuff hits the right spot you'll know it because it bubble like mad!

I do like the idea of trying smoke and will have to borrow a buddy's smoke machine to try it!
FWIW Grin  BK  Grin
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