350 Cummins injector problem?

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

  1. mile marker 27

    mile marker 27 Road Train Member

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    Put 25psi of air to the injector cup, to see if there was any leaks at valves or rings. No leaks I could see, hear or feel. Injectors tested good but swapped them when I reinstalled. Reran OH but left the jakes off and plugged rocker box oil supply. Started truck, no smoke on 1 or 2. It did however, smoke more at 5. Tore the top off 5 and 6, removed jake, plugged oil supply and ran OH on 5. Started truck and 5 kinda cleared up.
     
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  3. Inderjit

    Inderjit Heavy Load Member

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    When you rebuilt it how did the injector lobes look on the camshaft? If the hard surfacing is coming off the #1 injector lobe the engine will miss and white smoke on that cylinder
     
  4. mile marker 27

    mile marker 27 Road Train Member

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    Cam was spotless. I had it out because of timing change.
     
  5. mile marker 27

    mile marker 27 Road Train Member

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    I think the truck needs to be taken out, have the dog #### ran out of it, then rerun the OH. That said, ya’ll know alot more than me.
     
    W923 Thanks this.
  6. Inderjit

    Inderjit Heavy Load Member

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    You could be right. I rebuilt a lot of them. I used to take them for a drive up a long steep hill and lug them down. Never had a problem with rings not seating. How many hours since the rebuild? What did you time it at?
     
  7. mile marker 27

    mile marker 27 Road Train Member

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    Engine is timed at .035 for cpl 160.
     
  8. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Been gone. No, low compression doesn't necessarily mean anything with a piston or rings. Could be timing, valve train issues, etc. That's why I asked about adjustment. A simple valve adjustment/jake adjustment/push tube etc, can cause low compression.

    Looks like you figured it out
     
    mile marker 27 Thanks this.
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