Acert pistons

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mxs_cat, Sep 11, 2020.

  1. Sep 11, 2020 #1
    Mxs_cat

    Mxs_cat Bobtail Member

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    i recently had my acert rebuilt at an independent shop, i wanted to lower compression to 16:1 and had it reprogrammed for the delete.
    The part # listed for the new pistons is 356-4787. Can anyone confirm this is the lower compression piston or is that a stock acert piston?
    Thanks
     
    Mxs_cat, Sep 11, 2020
    Mxs_cat, Sep 11, 2020
    #1
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  3. Sep 11, 2020 #2
    spsauerland

    spsauerland Road Train Member

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    Checking Cat TMI, used in cylinder pack 10R-6215. That is a 18:1 CR kit. You wanted 10R7172 packs.
     
    spsauerland, Sep 11, 2020
    spsauerland, Sep 11, 2020
    #2
    pushbroom, A5¢, 650cat425 and 2 others Thank this.
  4. Sep 11, 2020 #3
    Truck engine machinist

    Truck engine machinist Light Load Member

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    Just machine .080" off of the tops of the 18:1 pistons, and you have 16:1.
     
    Truck engine machinist, Sep 11, 2020
    Truck engine machinist, Sep 11, 2020
    #3
    spsauerland and 650cat425 Thank this.
  5. Sep 12, 2020 #4
    Brettj3876

    Brettj3876 Road Train Member

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    I'd go back and raise hell about that
     
    Brettj3876, Sep 12, 2020
    Brettj3876, Sep 12, 2020
    #4
    Mxs_cat and spsauerland Thank this.
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