3406c mech black smoke on start up with new injectors

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mr79W900A, Nov 27, 2020.

  1. Mr79W900A

    Mr79W900A Bobtail Member

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    Hey guys had a number 5 injector go so when I pulled them we didn’t know the history of how long they were in so I replaced them all. Now on start up my truck at idle smokes black a lot more then before. My truck is turned up slightly the write way at about 26 psi. Is this just the new injectors causing this. Or a combo of new injectors and it being turned up a bit.
     
    6wheeler Thanks this.
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  3. 6wheeler

    6wheeler Road Train Member

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    I'm going to replace mine. I have the 3406e.
    I love hearing how great and wonderful Cat parts are that are brand new. I wish I had a Mack
     
  4. Roger McG

    Roger McG Light Load Member

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    Injectors meaning plungers and barrels in the injection pump? or injector nozzle in the cylinder head?
     
    mtoo and jamespmack Thank this.
  5. 062

    062 Road Train Member

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    6wheeler Thanks this.
  6. AModelCat

    AModelCat Road Train Member

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    Proper injectors?
     
    pushbroom Thanks this.
  7. bjrc

    bjrc Light Load Member

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    Fuel nozzles for the mechanical cat need the correct nozzle and the correct spacing to focus the fuel spray. The spacing is set with certain thickness sealing washer for the arrangement number of the engine.
     
    spsauerland and swaan Thank this.
  8. Roger McG

    Roger McG Light Load Member

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    If the rack isnt pinned in the pump on # 1 tdc and you set the plunger in the pump and miss alignment by just one tooth in the rack the engine will run but smoke to no end on an idle and skip terribly about 1200 to 1500 rpm
     
  9. 6wheeler

    6wheeler Road Train Member

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  10. Mr79W900A

    Mr79W900A Bobtail Member

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    There’s no skip. It runs good. Sorry fuel nozzles. Just used to electronic and saying other. I’ll try get a video tomorrow morning. It’s not bellowing black but smoking black on idle a fair bit. Where as before it barley had any smoke on idle.
     
  11. Mr79W900A

    Mr79W900A Bobtail Member

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    Mar 4, 2019
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