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350 Cummins injector problem?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Jan 8, 2024.

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  1. Jan 8, 2024 #1
    mile marker 27

    mile marker 27 Road Train Member

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    Recent build in a 350 small cam. Exchanged injectors and rebuilt heads. Noticed excessive white smoke, slight miss sound and fuel coming out of the exhaust manifold at the front 3 piece union. Pulled turbo and exhaust manifold, started engine and #2 is producing lots of white smoke and fuel. All other exhaust ports looked fine. Went deeper and pulled #2 injector and o-rings look good and are new. Any ideas?
     
    mile marker 27, Jan 8, 2024
    mile marker 27, Jan 8, 2024
    #1
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  3. Jan 8, 2024 #2
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Are you 100% certain the valves were adjusted correctly there?

    About the only possibilities are low compression or bad injector
     
    Big Road Skateboard, Jan 8, 2024
    Big Road Skateboard, Jan 8, 2024
    #2
    Last Call and Oxbow Thank this.
  4. Jan 8, 2024 #3
    mile marker 27

    mile marker 27 Road Train Member

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    Yes, I’m definitely sure. I set the injector first at 72”lbs or 6’lbs, then exhaust .023 and intake .011.
     
    mile marker 27, Jan 8, 2024
    mile marker 27, Jan 8, 2024
    #3
    MACK E-6 Thanks this.
  5. Jan 8, 2024 #4
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Double check adjustment. Swap injector to another cylinder. Does the miss fire go with the injector?
     
    BoxCarKidd, Jan 8, 2024
    BoxCarKidd, Jan 8, 2024
    #4
    Big Road Skateboard, MACK E-6, Goodysnap and 4 others Thank this.
  7. Jan 9, 2024 #5
    mile marker 27

    mile marker 27 Road Train Member

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    So, low compression = stuck ring? Once head is off, is there anyway to remedy a stuck ring without dropping pan and pushing piston out?
     
    mile marker 27, Jan 9, 2024
    mile marker 27, Jan 9, 2024
    #5
  8. Jan 9, 2024 #6
    OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Low compression can be valves leaking as well as rings not seated. Did you notice any excess blow by from the crankcase vent tube?

    As mentioned earlier swap that injector with another hole and see if the smoke / fuel follows the injector….
     
    OLDSKOOLERnWV, Jan 9, 2024
    OLDSKOOLERnWV, Jan 9, 2024
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    MACK E-6 Thanks this.
  9. Jan 9, 2024 #7
    SmallPackage

    SmallPackage Road Train Member

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    Bad injector push tube?
     
    SmallPackage, Jan 9, 2024
    SmallPackage, Jan 9, 2024
    #7
    OLDSKOOLERnWV Thanks this.
  10. Jan 9, 2024 #8
    W923

    W923 Road Train Member

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    Did you have the Jakes on it yet?
    Maybe wrong adjustment there is holding the exhaust valve off is seat…
     
    W923, Jan 9, 2024
    W923, Jan 9, 2024
    #8
  11. Jan 9, 2024 #9
    OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Not likely, does it ring when you bump it against a piece of steel? If so it’s not taking on oil….
     
    OLDSKOOLERnWV, Jan 9, 2024
    OLDSKOOLERnWV, Jan 9, 2024
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    SmallPackage Thanks this.
  12. Jan 9, 2024 #10
    W923

    W923 Road Train Member

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    Is it only at idle? Will it do it with a load on it?
     
    W923, Jan 9, 2024
    W923, Jan 9, 2024
    #10
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