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3406c mech black smoke on start up with new injectors

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

Page 1 of 2
  1. Nov 27, 2020 #1
    Mr79W900A

    Mr79W900A Light Load 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.
     
    Mr79W900A, Nov 27, 2020
    Mr79W900A, Nov 27, 2020
    #1
    6wheeler Thanks this.
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  3. Nov 27, 2020 #2
    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
     
    6wheeler, Nov 27, 2020
    6wheeler, Nov 27, 2020
    #2
  4. Nov 27, 2020 #3
    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?
     
    Roger McG, Nov 27, 2020
    Roger McG, Nov 27, 2020
    #3
    mtoo and jamespmack Thank this.
  5. Nov 27, 2020 #4
    062

    062 Road Train Member

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    062, Nov 27, 2020
    062, Nov 27, 2020
    #4
    6wheeler Thanks this.
  7. Nov 27, 2020 #5
    AModelCat

    AModelCat Road Train Member

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    Proper injectors?
     
    AModelCat, Nov 27, 2020
    AModelCat, Nov 27, 2020
    #5
    pushbroom Thanks this.
  8. Nov 27, 2020 #6
    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.
     
    bjrc, Nov 27, 2020
    bjrc, Nov 27, 2020
    #6
    spsauerland and swaan Thank this.
  9. Nov 27, 2020 #7
    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
     
    Roger McG, Nov 27, 2020
    Roger McG, Nov 27, 2020
    #7
  10. Nov 27, 2020 #8
    6wheeler

    6wheeler Road Train Member

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    6wheeler, Nov 27, 2020
    6wheeler, Nov 27, 2020
    #8
  11. Nov 27, 2020 #9
    Mr79W900A

    Mr79W900A Light Load Member

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    Mar 4, 2019
    British Columbia
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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.
     
    Mr79W900A, Nov 27, 2020
    Mr79W900A, Nov 27, 2020
    #9
  12. Nov 27, 2020 #10
    Mr79W900A

    Mr79W900A Light Load Member

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    Mar 4, 2019
    British Columbia
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    Nozzle inj #20R5169
     
    Mr79W900A, Nov 27, 2020
    Mr79W900A, Nov 27, 2020
    #10
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