ISX cracked block

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by BoxCarKidd, Oct 30, 2026 at 11:24 PM.

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  1. Oct 30, 2026 at 11:24 PM #1
    BoxCarKidd

    BoxCarKidd Road Train Member

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    A friend of mine has a 2011 ISX serial # 79441714. It was inframed by a truck dealership 100,000 miles ago.
    Now the block is cracked on the left side a little behind the air compressor and about 3 inched below the head gasket.
     
    BoxCarKidd, Oct 30, 2026 at 11:24 PM
    BoxCarKidd, Oct 30, 2026 at 11:24 PM
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  3. Oct 30, 2026 at 11:27 PM #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Did not mean to post this yet as I am still working on this. Wondering if it is possible for rolled liner o rings the crack a block on these.
     
    BoxCarKidd, Oct 30, 2026 at 11:27 PM
    BoxCarKidd, Oct 30, 2026 at 11:27 PM
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  4. Oct 31, 2026 at 12:08 AM #3
    Goodysnap

    Goodysnap Road Train Member

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    Seems like I saw one other crack in that same spot. I doubt the rebuild or workmanship has any effect on the crack in that area.

    Is it leaking? Oil?

    Just sucks
     
    Goodysnap, Oct 31, 2026 at 12:08 AM
    Goodysnap, Oct 31, 2026 at 12:08 AM
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  5. Oct 31, 2026 at 2:35 AM #4
    pushbroom

    pushbroom Road Train Member

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    Seen 2 blocks crack in that exact area. No ones fault, just falls under #### that happens. Crack is coming off the main oil gallery. I dont have any side pics but this is the pic with the front structure removed.
    20190108_104958.jpg
     
    Last edited: Oct 31, 2026 at 2:41 AM
    pushbroom, Oct 31, 2026 at 2:35 AM
    pushbroom, Oct 31, 2026 at 2:35 AM
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  7. Oct 31, 2026 at 7:56 AM #5
    BoxCarKidd

    BoxCarKidd Road Train Member

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    BoxCarKidd, Oct 31, 2026 at 7:56 AM
    BoxCarKidd, Oct 31, 2026 at 7:56 AM
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  8. Oct 31, 2026 at 7:57 AM #6
    BoxCarKidd

    BoxCarKidd Road Train Member

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    No just coolant.
     
    BoxCarKidd, Oct 31, 2026 at 7:57 AM
    BoxCarKidd, Oct 31, 2026 at 7:57 AM
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  9. Oct 31, 2026 at 12:39 PM #7
    Nss

    Nss Light Load Member

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    Is it possible where a head bolt goes into block? Have seen that on numerous blocks that head bolt holes did not get cleaned out before assembly
     
    Nss, Oct 31, 2026 at 12:39 PM
    Nss, Oct 31, 2026 at 12:39 PM
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  10. Oct 31, 2026 at 3:00 PM #8
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Do you suppose it would take a year and 100,000 miles to show up?
     
    BoxCarKidd, Oct 31, 2026 at 3:00 PM
    BoxCarKidd, Oct 31, 2026 at 3:00 PM
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  11. Oct 31, 2026 at 3:06 PM #9
    DUNE-T

    DUNE-T Road Train Member

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    I have seen quite a few ISXs crack in that spot
     
    DUNE-T, Oct 31, 2026 at 3:06 PM
    DUNE-T, Oct 31, 2026 at 3:06 PM
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  12. Oct 31, 2026 at 3:58 PM #10
    SmallPackage

    SmallPackage Road Train Member

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    A friend of mine has tested thousands of diesel engines at Southwest Research. He says a crack in a block like that is almost always caused by harmonic flexing. In other words. The vibration that goes through the casting during low rpm lugging. Look at the way the casting shifted over at the too of that crack in the pic. That is a tell tale of it. It is from shaking side to side. Not being pressed up or down.
     
    SmallPackage, Oct 31, 2026 at 3:58 PM
    SmallPackage, Oct 31, 2026 at 3:58 PM
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