Doffer 3 Posted February 9, 2013 Share Posted February 9, 2013 (edited) I have an annoying air leak on my 2001 mack RD688S Cab-Over pump truck. The Secondary tank is holding air, but the primary is leaking off when sitting overnight. Can i dump some UV Dye into the tank and wait for it to leak off then check all the air lines with a UV light, or will the UV dye hurt something? Edited February 9, 2013 by Doffer Quote Link to post Share on other sites
2stacksuperdog 4,122 Posted February 9, 2013 Share Posted February 9, 2013 That is a new way of doing it. Quote Matt Link to post Share on other sites
Doffer 3 Posted February 9, 2013 Author Share Posted February 9, 2013 That is a new way of doing it.do you think that would work pretty good? Quote Link to post Share on other sites
2stacksuperdog 4,122 Posted February 9, 2013 Share Posted February 9, 2013 Only way to find out is try it right? Quote Matt Link to post Share on other sites
Doffer 3 Posted February 9, 2013 Author Share Posted February 9, 2013 I'll try it out and report back Quote Link to post Share on other sites
theakerstwo 830 Posted February 9, 2013 Share Posted February 9, 2013 get a grand son out there and they can hear it if they close their mouth. 1 Quote glenn akers Link to post Share on other sites
jakebrake86 440 Posted February 9, 2013 Share Posted February 9, 2013 My only concern would be clogging up valves and what not, but if it's safe in a/c systems I don't see why it wouldn't be cool in air systems as well. I've got a couple of pesky air leaks I've been tracking down on my RD, too. Sometimes if I can track it down to a somewhat certain spot, I'll spray a little soapy water on it to pinpoint where it is. I think a couple of years of running open cab TS 14 Euclid scrapers with twin 471 green leaker screamin demons has forever limited my air leak finding abilities by hearing alone. LOL Quote Jake Link to post Share on other sites
Dougsr 56 Posted February 9, 2013 Share Posted February 9, 2013 i used to use kids bubbles to find leaks on the big AC systems when I worked offshore. You could put it in a spray bottle. You can buy it by the gallon. That is what i did.Doug Quote Link to post Share on other sites
220cummins 291 Posted February 9, 2013 Share Posted February 9, 2013 Murphys oil soap has been the go to for leaks Quote Link to post Share on other sites
realwolfdaddy 14 Posted February 9, 2013 Share Posted February 9, 2013 Find a large tub or water and submerse the truck and look for where the bubbles come from. LOL! Seriously soapy spray works best for me. Quote Link to post Share on other sites
rsb502 1,679 Posted February 10, 2013 Share Posted February 10, 2013 I just use a little dish soap mixed with water in a spray bottle to find air leaks, as far as UV dye goes an air brake system ain't quite like an a/c system there is quite a pressure difference and a/c systems are made to circulate oil and the die goes runs with the oil. Air brake systems are not happy about fluids and the dryer will more than likely catch it all if you put it in before it and in the large air tanks it will drop to the bottom and sit at the drain. Truck air tanks are made with the air fittings above the 50% line to keep moisture out of the lines and in the tank to be drained. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to post Share on other sites
Solution cl733 0 Posted February 25, 2013 Solution Share Posted February 25, 2013 mix up a bucket of soapy water, get a broom handle and tape a piece of 3/8 clear hose to it , suck up some soapy water using your mouth on the hose, use the stick to reach into spots, like under the cab, and hard spots to reach , and blow some soapy water on your connections , watch for bubbles, its worked for me trying to reach under the cab and hard to reach places, Quote Link to post Share on other sites
Stick-man 0 Posted March 16, 2013 Share Posted March 16, 2013 First, go where it's as quiet as possible, and use your ears. Then, follow the lines from the primary tankand spray every connection with dollar store dish soap and water, heavy on the soap. Some, you can't hear until you're right up on it. But the soap will tell everything. Quote Link to post Share on other sites
Samogen 0 Posted July 27, 2019 Share Posted July 27, 2019 Spray bottle with soapy water is a universal leak finder tool. It doesn't work for inner leaks though like valves. Air preasure monometer with hose couplings works just fine to find such leaks. Quote Link to post Share on other sites
BOB DINGSDALE 191 Posted July 29, 2019 Share Posted July 29, 2019 is there a one way check valve between compressor and primary tank.If not your valves in compressor could be leaking back. Something you would never hear. If you havn't got one in line get one and try it. Quote Link to post Share on other sites
tenfive0 166 Posted August 3, 2019 Share Posted August 3, 2019 Quote Link to post Share on other sites
blackdog2 444 Posted August 3, 2019 Share Posted August 3, 2019 hook up shop air shut truck off chock wheels put in gear take key out > Quote Ed Link to post Share on other sites
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