New injector torque specs big cam Cummins

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Binderdavemays1, Aug 6, 2024.

  1. Binderdavemays1

    Binderdavemays1 Bobtail Member

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    Good morning all, last Sunday we worked on the Eagle 9670 all day and it was a blast, I truly love this truck.
    So we pulled valve covers, loosened the injector rockers and pulled old injectors and they were junk! Cleaned out ports oiled and installed new injectors… it was a fun day!

    first question should I have poured a little trans fluid in port before installing injectors? And if yes can I pull the top stop pin and put a little in there without trying to pull the new injectors back out?

    next question since I didn’t touch exhaust or intake valves can I just torque injector hold down bolts (2) x 6 @ 168 inch pounds and injector rockers to 6 inch pounds and be done?
    If I only do injector torque do I have to spin motor to ABC or can I just torque them?
    Or do I have to run the overhead on everything?
    We are very close to trying to fire it, cleaned fuel tanks and all lines, replaced all filters and oils and charged all batteries, I have not reinstalled the valve covers yet so whatever you all tell me to do I will do…
    Thanks in advance, forever grateful…
    BinderDave
     
    Big Road Skateboard Thanks this.
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Nothing for ya Dave, but it brought back memories of my dads little 1/4" inch pound Snap On screwdriver torque wrench.

    Thanks
     
    ElmerFudpucker and Oxbow Thank this.
  4. Binderdavemays1

    Binderdavemays1 Bobtail Member

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    I have that torque wrench too.
    Thanks for responding
    Not a snap on though lol
     
    Oxbow Thanks this.
  5. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    If you just randomly pulled the injectors and replaced them, yes you need to run the ABC code and adjust the injectors properly.

    When replacing the injectors I pull the injector after rolling the engine to the proper position for that injector, then pull / replace / and adjust that injector, then roll the engine to the next position for the next injector and repeat the same process.

    I take it you probably have top stop injectors….?
     
    Deere hunter, wore out, Oxbow and 2 others Thank this.
  6. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Depending on how many miles on the engine since the last tuneup, if not many then yes you can get by with only adjusting the injectors, but since you are already in there……
     
    ElmerFudpucker, Oxbow and Star Rider Thank this.
  7. Binderdavemays1

    Binderdavemays1 Bobtail Member

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    Yes top stop injectors
    Ok so I know the overhead was done a 1 1/2 years ago. And the truck died from contamination then so it’s been sitting for that long…
    The old injectors were totaled, completely covered in junk….which is why it stopped I hope
    The motor doesn’t have a big center bolt to hand spin it, will the smaller bolts work for this? I believe there are 5-6 of them
     
    OLDSKOOLERnWV Thanks this.
  8. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    No……. You use the nut in the center of the accessory drive pulley. Should take a 1-5/16” socket. Just line the pointer up with the A-B-C on the outer edge of the pulley closest to the front cover….
     
  9. Binderdavemays1

    Binderdavemays1 Bobtail Member

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    When I looked at the accessory drive pulley I didn’t see a center nut, it appeared to be a smooth shaft but I will look again
     
  10. Binderdavemays1

    Binderdavemays1 Bobtail Member

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    It looks like this, no center nut
    Or is the center nut deep inside pulley to the top right?
     
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