dondiesel444 Posted May 6, 2017 Share Posted May 6, 2017 (edited) 1993 E7 350 full mechanical.....anyone ever hear of this? not a constant leak but when pulling a hill, boost will drop in half, engine will loose all power, and a massive air leak can be heard right behind the cab, where the air dryer is. after downshifting, boost comes back, no air leaking, then a few seconds later, same thing....might be happening when the dryer is calling the compressor to build air? pretty sure it's an AD9 dryer... Edited May 6, 2017 by dondiesel444 Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted May 6, 2017 Share Posted May 6, 2017 If the dryer is over two years old then just exchange it. Quote glenn akers Link to comment Share on other sites More sharing options...
dondiesel444 Posted May 6, 2017 Author Share Posted May 6, 2017 it looks original! so is it possible that's where the leak is coming from? somehow the boost pressure is feeding back through the compressor supply line or something? Quote Link to comment Share on other sites More sharing options...
fjh Posted May 7, 2017 Share Posted May 7, 2017 Yup what he said change it Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted May 7, 2017 Share Posted May 7, 2017 5 hours ago, dondiesel444 said: it looks original! so is it possible that's where the leak is coming from? somehow the boost pressure is feeding back through the compressor supply line or something? What is happening is the cut off valve is not cutting off in the drier.I had one same way and I could hear it but dont think it was losing that much boost. 1 Quote glenn akers Link to comment Share on other sites More sharing options...
dondiesel444 Posted May 8, 2017 Author Share Posted May 8, 2017 ok I'll try that first, hopefully it solves the problem, thanks Quote Link to comment Share on other sites More sharing options...
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