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Need help with UNLOADER PISTON removal on Detroit 60

Discussion in 'Freightliner Forum' started by MercerDriver, Nov 12, 2015.

  1. Nov 12, 2015 #1
    MercerDriver

    MercerDriver Light Load Member

    69
    7
    Sep 3, 2010
    Atlanta, GA
    0
    I've been trying to figure out how to pull out the unloader piston on the BA921 compressor to replace it.

    The balance piston (looks like a mushroom with a long stem) and spring come out no problem, but I don't know if the piston itself is baked onto the head of the compressor or not. Is there a tool or technique to pull these out ? Do I need some kind of a pulley puller if they're pressed into the head ?

    Any help appreciated.
     
    MercerDriver, Nov 12, 2015
    MercerDriver, Nov 12, 2015
    #1
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  3. Nov 12, 2015 #2
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,780
    1,726
    Jun 14, 2009
    romulus,mi
    0
    It will come out, you just have to work it. Since you are replacing it take a lag bolt, thread it in and pull out. I have done many and learned long ago to take the head off and rebuild it completely with new gaskets. You have no idea how much build up is inside. If what you are doing works, it will only last for a short time. Good Luck.
     
    QUALITYTRUCK, Nov 12, 2015
    QUALITYTRUCK, Nov 12, 2015
    #2
  4. Nov 13, 2015 #3
    sailboatjim

    sailboatjim Light Load Member

    292
    173
    Aug 27, 2014
    Boston, Mass
    0
    BA21 Data Sheet
     

    Attached Files:

    sailboatjim, Nov 13, 2015
    sailboatjim, Nov 13, 2015
    #3
    QUALITYTRUCK Thanks this.
  5. Nov 17, 2015 #4
    mgrantes

    mgrantes Light Load Member

    111
    30
    Apr 26, 2013
    0
    I just replaced my unloader piston. Basically, in order to combat the vacuum you have to remove the airline to the unloader port. This will allow air into the system as you remove the piston, thus making it a lot easier to remove. Before I removed the airline I couldn't get the thing to budge.
     
    mgrantes, Nov 17, 2015
    mgrantes, Nov 17, 2015
    #4
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