cruiseliner64 Posted 5 hours ago Share Posted 5 hours ago Hi all,We started the Cruiseliner for the first time in 7 months today and it started first turn of the key....but it wont build air pressure over 20psi.When the engine is shut down the air can be heard leaking back through the compressor.Im thinking its the unloader valves are stuck.My question is does the compressor head have to be taken off to clean them or is there some other way to clean them? I think its a Midland compressor.Thanks Paul Quote Link to comment https://www.bigmacktrucks.com/topic/76229-low-air-pressure/ Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago (edited) Is the D-2 governor new ? If not, they are cheap enough to just replace it. You can try to spray a very light oil into the intake of the compressor and gently tapping on the head with it running while doing this. 7 months idle may have them stuck. Edited 4 hours ago by Joey Mack More info needed 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76229-low-air-pressure/#findComment-587007 Share on other sites More sharing options...
Geoff Weeks Posted 4 hours ago Share Posted 4 hours ago If it is leaking back through the compresssor, it is the outlet (exh) valves. If the gov is mal functioning it can leak through the unloader. Try disconnecting the gov from the unloader and see if it will build. Caution: with gov disconnected it will never stop building air pressure, so don't run it all the way up. If it builds to over 60, shut it down and you know the gov is the problem. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76229-low-air-pressure/#findComment-587010 Share on other sites More sharing options...
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