ISX cracked counterbores

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Truck engine machinist, Mar 30, 2018.

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  1. Mar 30, 2018 #1
    Truck engine machinist

    Truck engine machinist Light Load Member

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    I am repairing, many ISX blocks with medium to majorly cracked counterbores. Do not let your your repair shop, or Cummins, tell you, that the block needs to be replaced, because of cracked counterbores. They can be made better than new, while still installed in the truck.
     
    Truck engine machinist, Mar 30, 2018
    Truck engine machinist, Mar 30, 2018
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  3. Mar 30, 2018 #2
    tallmon

    tallmon Medium Load Member

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    How?
     
    tallmon, Mar 30, 2018
    tallmon, Mar 30, 2018
    #2
  4. Mar 30, 2018 #3
    swaan

    swaan Road Train Member

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    Man o man.

    These isx engines sure seem like a pile of crap. All I ever hear about is nothing but bad . How's a guy supposed to make any money with this red engine under the hood.? Cracked counterbores now too!?
     
    swaan, Mar 30, 2018
    swaan, Mar 30, 2018
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  5. Mar 31, 2018 #4
    Truck engine machinist

    Truck engine machinist Light Load Member

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    I bore them for custom made, thick stainless steel shims until the cracks are gone. (Usually .090" to .150"). They crack because Cummins runs them too low from the factory. (Usually .009-.010") The liner then bounces on the counterbore, causing them to crack. (Mainly 2010-2012 with 152mm liners) I get them up to .014 protrusion.
     
    Truck engine machinist, Mar 31, 2018
    Truck engine machinist, Mar 31, 2018
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  7. Mar 31, 2018 #5
    HopeOverMope

    HopeOverMope Road Train Member

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    Yup, When we rebuilt my ISX last year, we brought it up to .14 protrusion. Better believe I was in there for the before and after measurements!
     
    HopeOverMope, Mar 31, 2018
    HopeOverMope, Mar 31, 2018
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  8. Mar 31, 2018 #6
    Roberts450

    Roberts450 Road Train Member

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    I wonder if this is more prone to engines that get pulled down below 1300rpm? I have an X15 performance series in my new truck and she seems pretty pissed off when I pull it below 1300 with any weight behind it.
     
    Roberts450, Mar 31, 2018
    Roberts450, Mar 31, 2018
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  9. Mar 31, 2018 #8
    Truck engine machinist

    Truck engine machinist Light Load Member

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    I do not know, but I do suspect that lugging affects them.
     
    Truck engine machinist, Mar 31, 2018
    Truck engine machinist, Mar 31, 2018
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  10. Mar 31, 2018 #8
    AModelCat

    AModelCat Road Train Member

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    What's the typical cost to machine out the cracks and install the stainless shims?
     
    AModelCat, Mar 31, 2018
    AModelCat, Mar 31, 2018
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  11. Mar 31, 2018 #9
    Truck engine machinist

    Truck engine machinist Light Load Member

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    $600.00 to cut all for .058"shims. $75.00 for each additional cut. (about .030" per cut) (.150" = 3 more cuts.) Plus shims $62.50-$120.00 each, depending on thickness) Plus travel time. I can travel anywhere.
     
    Truck engine machinist, Mar 31, 2018
    Truck engine machinist, Mar 31, 2018
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  12. Mar 31, 2018 #10
    Truck engine machinist

    Truck engine machinist Light Load Member

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    It is far cheaper than replacing the block. In my opinion, a new block needs to have the counterbores shimmed to bring liners up to .014" or it may eventually fail also.
     
    Truck engine machinist, Mar 31, 2018
    Truck engine machinist, Mar 31, 2018
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