Quote:
Originally Posted by eplurubus
There's air blowing straight through the air dryer.
I replaced the purge valve, and went ahead and put a new filter on too. I turned down the governor cut-off to 90 psi and it still blew air through (I turned it back up).
System drops and rebuilds on a 33 second interval when it's at its worst. Sometimes it drops and holds at about 100 psi for a little while before rebuilding again. Only the primary air drops; secondary air is stable.
I'm afraid my compressor is going to burn up. What could be causing this problem? Is there another valve somewhere between the air compressor and the air-dryer purge valve that might be bad?
As a last resort I'll go to a shop, but these days I fancy doing the repairs myself.
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I had a similar problem on mine truck and even replaced the entire air dryer and it didn't help. on top of air blowing through the end of the drier there was also this crazy whistling sound made by this air (because of the high pressure and narrow opening). people were literally turning their heads when i was pulling into truck stops
there was also a leak in a couplings on the wet and dry tank and I had those fixed (where the air hose connects to the tank). This helped somewhat but really cured this problem was draining the wet tank every morning in warm weather and every night in cold weather. Before I used to drain the wet tank only a couple of times a week, but after I switched to doing it daily, the dryer stopped whistling
Try spraying windshield wash on tank couplings with the engine working - you might have a leak there. And try draining the wet tank every day FULLY, until no air is left in it.