Truck#1 Posted October 25, 2007 Share Posted October 25, 2007 .....continue. I concurred with Glenn and thought my new air dryer was defective so I took it back and got another. The new one is kind of doing the same thing but not quite.It charges up to about 125psi, the purge valve spits, then it ticks like a bomb. But the ticking is related to engine speed. The higher the rpm's the faster the ticking and it almost sounds like a machine gun. It will tick until the red needle (what tank is that???) drops to 100 psi, the ticking stops and the compressor kicks in again. This is different form the old dryer (which was brand new) That one would tick and then just hiss air continueously. I did put a new unloader kit in the compressor (with the last air dryer) but I had a small problem with the gasket leaking under the cover. I took it off and sealed it with gasket sealer (I was desperate). I did notice the front piston seemed to be stuck in the hole. The rear one popped up when i took the cover off. This is the AD-SP dryer. Any more help would be appreciated. It is a 98 CH with a 427 by the way.Thanks in advance,Rob W. Quote Link to comment https://www.bigmacktrucks.com/topic/3006-the-air-dryer-chronicles/ Share on other sites More sharing options...
briguy520 Posted October 30, 2007 Share Posted October 30, 2007 .....continue. I concurred with Glenn and thought my new air dryer was defective so I took it back and got another. The new one is kind of doing the same thing but not quite.It charges up to about 125psi, the purge valve spits, then it ticks like a bomb. But the ticking is related to engine speed. The higher the rpm's the faster the ticking and it almost sounds like a machine gun. It will tick until the red needle (what tank is that???) drops to 100 psi, the ticking stops and the compressor kicks in again. This is different form the old dryer (which was brand new) That one would tick and then just hiss air continueously. I did put a new unloader kit in the compressor (with the last air dryer) but I had a small problem with the gasket leaking under the cover. I took it off and sealed it with gasket sealer (I was desperate). I did notice the front piston seemed to be stuck in the hole. The rear one popped up when i took the cover off. This is the AD-SP dryer. Any more help would be appreciated. It is a 98 CH with a 427 by the way.Thanks in advance,Rob W. Quote Link to comment https://www.bigmacktrucks.com/topic/3006-the-air-dryer-chronicles/#findComment-14790 Share on other sites More sharing options...
briguy520 Posted October 30, 2007 Share Posted October 30, 2007 .....continue. I concurred with Glenn and thought my new air dryer was defective so I took it back and got another. The new one is kind of doing the same thing but not quite.It charges up to about 125psi, the purge valve spits, then it ticks like a bomb. But the ticking is related to engine speed. The higher the rpm's the faster the ticking and it almost sounds like a machine gun. It will tick until the red needle (what tank is that???) drops to 100 psi, the ticking stops and the compressor kicks in again. This is different form the old dryer (which was brand new) That one would tick and then just hiss air continueously. I did put a new unloader kit in the compressor (with the last air dryer) but I had a small problem with the gasket leaking under the cover. I took it off and sealed it with gasket sealer (I was desperate). I did notice the front piston seemed to be stuck in the hole. The rear one popped up when i took the cover off. This is the AD-SP dryer. Any more help would be appreciated. It is a 98 CH with a 427 by the way.Thanks in advance,Rob W.hey maybe you should take it to pozzo before you spend anymore money than you have too thats what they get paid for johnny Quote Link to comment https://www.bigmacktrucks.com/topic/3006-the-air-dryer-chronicles/#findComment-14791 Share on other sites More sharing options...
Truck#1 Posted October 31, 2007 Author Share Posted October 31, 2007 I did 1 better. I talked to a Bendix tech. He said it was "Flat Tires" fault. Quote Link to comment https://www.bigmacktrucks.com/topic/3006-the-air-dryer-chronicles/#findComment-14796 Share on other sites More sharing options...
ThaddeusW Posted November 5, 2007 Share Posted November 5, 2007 Rob, I just read this bit of info on the bendix website:In the event that the compressor unloadermechanism or governor malfunctions, at approximately 200psi supply air pressure the AD-SP™ air dryer purge valvewill open (without control pressure), and vent excess airpressure to atmosphere. Here is the PDF I got this tidbit from:http://www.bendixvrc.com/itemDisplay.asp?documentID=2568 Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/3006-the-air-dryer-chronicles/#findComment-14901 Share on other sites More sharing options...
Truck#1 Posted November 5, 2007 Author Share Posted November 5, 2007 I appreciate everyone's help. The problem turned out to be the unloader valves. I installed a new kit once and had problems because I never scraped off all the old gasket and I used a RTV sealer (a big no-no). So another new kit ($11) and I'm good to go. Thanks again guys. Rob Quote Link to comment https://www.bigmacktrucks.com/topic/3006-the-air-dryer-chronicles/#findComment-14913 Share on other sites More sharing options...
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