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Detroit 12.7 Broken Crankshaft

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Smellfunny, Jul 30, 2015.

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  1. Jul 30, 2015 #1
    Smellfunny

    Smellfunny Road Train Member

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    image.jpg image.jpg Just sharing again. Found 2 rod bearings (1) and (3) cylinder that were shattered. Noticed the crank had crack in it so took it out.
     

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    Smellfunny, Jul 30, 2015
    Smellfunny, Jul 30, 2015
    #1
    icsheeple and skellr Thank this.
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  3. Jul 30, 2015 #2
    baha

    baha Road Train Member

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    How many mi. on this eng.
     
    baha, Jul 30, 2015
    baha, Jul 30, 2015
    #2
  4. Jul 30, 2015 #3
    allan5oh

    allan5oh Road Train Member

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    That's nasty, any idea what caused it? Engine turned up?
     
    allan5oh, Jul 30, 2015
    allan5oh, Jul 30, 2015
    #3
  5. Jul 30, 2015 #4
    Brian's Transport

    Brian's Transport Bobtail Member

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    wow big time cracks. did it lock up?
     
    Brian's Transport, Jul 30, 2015
    Brian's Transport, Jul 30, 2015
    #4
  7. Jul 30, 2015 #5
    KB3MMX

    KB3MMX Road Train Member

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    more details please
     
    KB3MMX, Jul 30, 2015
    KB3MMX, Jul 30, 2015
    #5
  8. Jul 30, 2015 #6
    Smellfunny

    Smellfunny Road Train Member

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    Brought in for bull gear damage. Put in bull gear, crank gear, and air compressor gear. Customer asked to inspect main and rod bearings. Pulled a couple main bearing caps and found wear. Put in all mains, put in two rods and on the third one found busted up rod bearing. Got to looking and noticed crack. I would imagine the miles is around 1.8 million.
     
    Smellfunny, Jul 30, 2015
    Smellfunny, Jul 30, 2015
    #6
    icsheeple and baha Thank this.
  9. Jul 30, 2015 #7
    Smellfunny

    Smellfunny Road Train Member

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    He had it towed in. So we did not hear it run before we started working on it. Just went by what he said was going on. I pulled the pan plug in the yard and got bull gear teeth out.
     
    Smellfunny, Jul 30, 2015
    Smellfunny, Jul 30, 2015
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    icsheeple Thanks this.
  10. Jul 30, 2015 #8
    KB3MMX

    KB3MMX Road Train Member

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    Time for some new parts I guess!
     
    KB3MMX, Jul 30, 2015
    KB3MMX, Jul 30, 2015
    #8
  11. Jul 31, 2015 #9
    GrapeApe

    GrapeApe Road Train Member

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    I've seen that before at the front when a gear fails and chunk gets between the bull and crank gears. I seen one shear the nose right off. Went for a road call once because the fan wouldn't come on and it was running hot. Found the damper and fan belts not moving at all. The gears and accessory driver were turning, so it ran, had a water pump, alternator and A/C, just no fan.

    When I tore it apart, the bull and crank gears were missing chunks and the crank was broken right in front of the crank gear.

    So my guess would be that a chunk of gear got between and shocked the crank so hard that it cracked.
     
    GrapeApe, Jul 31, 2015
    GrapeApe, Jul 31, 2015
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  12. Jul 31, 2015 #10
    Smellfunny

    Smellfunny Road Train Member

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    Probably right Grape. I think it was #4 and #1 rod bearing that was busted up (not 3). So it probably got "shocked" then.
     
    Smellfunny, Jul 31, 2015
    Smellfunny, Jul 31, 2015
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