3406e smoking on startup

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kenllah, Nov 4, 2020.

  1. Kenllah

    Kenllah Light Load Member

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    Perhaps it is. Totally missing on 2 injectors. I know for sure the middle o-ring isn't supposed to be cracked or broken.
     
    cke Thanks this.
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  3. lester

    lester Midwest's #1 Feed Hauler

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    Yes the o-ring on the tip is designed to burn off and be replaced by a dam of carbon.. but yes obviously the rest of the o-rings should be in tact
     
    Kenllah, cke and spsauerland Thank this.
  4. Kenllah

    Kenllah Light Load Member

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    UPDATE: Replaced all injector orings and hey look same problem... pulled the exhaust manifold back (one broken stud). Fired it up and there's 2 wet exhaust holes #2 and #4. Will be swapping 2 & 4 injectors to other holes to see if the problem follows. Probably should have done that first but it needed orings so... if you have a similar problem just pull the exhaust manifold back and see what you have. Plug the oil supply line for the turbo so you can start it. I used a piece of steel plate with a bit of ultra black sealant and some vice grips to hold the plate with no leaks.
     
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  5. Kenllah

    Kenllah Light Load Member

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    Ok, I actually have 3 exhaust holes (2,3,4)with fuel and white smoke. Unplug the injector while running and smoke goes away on all 3. Swapped #1 & #2 injectors and problem didn't move to #1 cylinder. Looking at options now. Going to air up cylinders one at a time to see if air is leaking out valves or rings. Not sure if there is a way to check ecm power. Injector harness in rocker is brand new. Have to check fuel pressure as well just in case. Any other ideas or if anyone has experience on compression test or leak down test would be nice.
     
  6. Kenllah

    Kenllah Light Load Member

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    It doesn't like my video format so here some photos.
     

    Attached Files:

  7. Truck engine machinist

    Truck engine machinist Light Load Member

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    Your injector seats in the head, are bad. I can machine them, in-frame.
     
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  8. Kenllah

    Kenllah Light Load Member

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    How do I test to verify injector seats
     
  9. Truck engine machinist

    Truck engine machinist Light Load Member

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    Smoke on start up. O-rings burned up. Carbon build up on injector barrels. Air in fuel system.
     
    spsauerland Thanks this.
  10. Truck engine machinist

    Truck engine machinist Light Load Member

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    Put the fuel return line, from the head, into a bucket of diesel fuel. If bubbles come through, your injector seats are most likely bad. I repaired a lot of them, with your exact symptoms.
     
    Kenllah Thanks this.
  11. Kenllah

    Kenllah Light Load Member

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    Brand new o-rings all injectors. It's only certain cylinders and problem does not follow injectors
     
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