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Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mr Bob, May 1, 2024.

  1. May 1, 2024 #1
    Mr Bob

    Mr Bob Light Load Member

    269
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    Mar 17, 2015
    0
    Navistar KN329441 SPN 188 FMI 18. Runs very rough, white smoke, no power. Cyl 5&6 timing is not the same as the rest.
     
    Mr Bob, May 1, 2024
    Mr Bob, May 1, 2024
    #1
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  3. May 1, 2024 #2
    Mr Bob

    Mr Bob Light Load Member

    269
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    Mar 17, 2015
    0
    compression test was dragging one cylinder. valve bridge popped off. but why?
     
    Mr Bob, May 1, 2024
    Mr Bob, May 1, 2024
    #2
  4. May 1, 2024 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,535
    6,599
    Aug 26, 2014
    0
    Broken cam? Some thing has to be way out of wack for a bridge to be out of place. Dropped valve, broken valve spring, Engine over speeded but no history for that?
     
    BoxCarKidd, May 1, 2024
    BoxCarKidd, May 1, 2024
    #3
    AModelCat Thanks this.
  5. May 2, 2024 #4
    Mr Bob

    Mr Bob Light Load Member

    269
    84
    Mar 17, 2015
    0
    initial look, springs look ok. engine was still hot. should there be a code if it over reved? i was thinking over rev but im gonna look at the cam today. bridge looks fine. adjuster look good.
     
    Mr Bob, May 2, 2024
    Mr Bob, May 2, 2024
    #4
  7. May 2, 2024 #5
    Mr Bob

    Mr Bob Light Load Member

    269
    84
    Mar 17, 2015
    0
    roller on rocker arm wont roll good and is offset away from the cam. bushing or pin must have failed.
     
    Mr Bob, May 2, 2024
    Mr Bob, May 2, 2024
    #5
  8. May 5, 2024 #6
    sirrepairsalot

    sirrepairsalot Light Load Member

    66
    28
    Aug 9, 2018
    Canada
    0
    Over Revving will take your rockers and send them out of oblivion!
     
    sirrepairsalot, May 5, 2024
    sirrepairsalot, May 5, 2024
    #6
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