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  1. #14
    Join Date
    Aug 2010
    Probably going to need a lip seal kit on that compressor. It relieves the pressure back to the crankcase so the slide valve piston can move to the unload position. But if that compressor already has one then your looking at something else.

  2. #15
    Join Date
    Feb 2010
    San Antonio
    When we ran checks under service bulletin #4 checking the load and unload solenoid, the piston pressure actually increased when we energized the unload solenoid. This makes me think it is a lip seal failure. BUT in service bulletin #18 on lip seal problems, an increase of piston pressure on call for unload would indicate a leaking piston. I am quite sure I don't want to replace the piston.

  3. #16
    Join Date
    Dec 2007
    Next to Wal-Mart
    Changing the piston really is not that bad. Just be careful how far you spread the sections of the compressor. If you hear a heavy "thunk" you have a boat anchor.

  4. #17
    Join Date
    Mar 2004
    ottawa canada
    Just be careful how far you spread the sections of the compressor. If you hear a heavy "thunk" you have a boat anchor.

    Im not sure how you are attempting to change the piston but it sounds very wrong to me . All you need to do is dissconect the discharge line and remove the end plate ...
    Unless of course the nut on the piston wont unscrew then you have another whole different set of problems !!!!!!!
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the garage , greasin', oilin' . tweakin' n shinin' Roll on spring 2015 !!

  5. #18
    Join Date
    Mar 2010
    Did the load and unload solenoids test ok? If the load/unload valves are holding then you can connect a manifold set to the schrader on piston cavity and on the suction line. Open the gauge set to relieve the pressure on the piston cavity back to the suction line. The piston pressure should drop close to suction pressure. If the pressure doesn't drop or drops and comes back up to discharge pressure then the lip seal is leaking. The piston could be leaking but it's more probable that the lip seal is leaking. The lip seal re-rout is a easy install. Trane had problems with the lip seal leaking.

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