Hypoxia Posted February 8, 2022 Share Posted February 8, 2022 (edited) I aired up the coach with shop air and heard an air leak from 20' away. It was the Holset Turbo Actuator Air Control Valve 3770742 . Inland Kenworth had it in stock so a couple of hours later and a much lighter wallet that leak has been resolved. Who knows how long it was a small leak and in an inaccessible spot that I probably would have never discovered it. Edited February 8, 2022 by Hypoxia Link to comment Share on other sites More sharing options...
Gary 05 AMB DST Posted February 8, 2022 Share Posted February 8, 2022 Jim, Where is the actuator located? That thing is sure expensive. Gary 05 AMB DST Link to comment Share on other sites More sharing options...
Hypoxia Posted February 8, 2022 Author Share Posted February 8, 2022 12 minutes ago, Gary 05 AMB DST said: Jim, Where is the actuator located? That thing is sure expensive. Gary 05 AMB DST Curbside under the compressor on the ISX. Link to comment Share on other sites More sharing options...
jacwjames Posted February 8, 2022 Share Posted February 8, 2022 I guess this is another "Pay to Play" type parts, they think highly of it and after a quick search the price is pretty much fixed. So you couldn't hear a leak after you parked, only after you filled your compressed air system remotely??? Link to comment Share on other sites More sharing options...
Paul A. Posted February 8, 2022 Share Posted February 8, 2022 4 hours ago, Hypoxia said: I aired up the coach with shop air and heard an air leak from 20' away. It was the Holset Turbo Actuator Air Control Valve 3770742 . Inland Kenworth had it in stock so a couple of hours later and a much lighter wallet that leak has been resolved. Who knows how long it was a small leak and in an inaccessible spot that I probably would have never discovered it. Did you consider a rebuit one, or, a rebuild kit? Link to comment Share on other sites More sharing options...
Gary 05 AMB DST Posted February 8, 2022 Share Posted February 8, 2022 40 minutes ago, Paul A. said: Did you consider a rebuit one, or, a rebuild kit? Myself I wouldn't trust control of the turbo to a rebuilt one. Gary 05 AMB DST Link to comment Share on other sites More sharing options...
Hypoxia Posted February 8, 2022 Author Share Posted February 8, 2022 It was just a coincidence that I heard the leak using shop air. It may have been a slow leak that turned into a large leak or possibly a diaphragm ruptured at that point in time. I considered a rebuilt one but the ISX guys convinced me to get a new Holset. If it saves a problem while travelling it's worth it but we'll never know about that now. Link to comment Share on other sites More sharing options...
Hypoxia Posted February 25, 2022 Author Share Posted February 25, 2022 Started the coach for a fuel run, no air. Fortunately I could hear an air leak coming from the compressor governor so I ran to Inland Kenworth and purchased a replacement ($15). An hour later I had air! Link to comment Share on other sites More sharing options...
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