Cummins nta questions l.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by L9000, Jun 7, 2026.

  1. L9000

    L9000 Bobtail Member

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    Does a 1982 nta 400 have mechanical or electronic injectors ?
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Mechanical and will bolt right in place of your BC4. BC4 has low flow cooling and the 82 model is high flow. You just opened another bag of snakes.
     
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  4. L9000

    L9000 Bobtail Member

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    What year was low flow introduced ?
     
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  5. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Somewhere in the time period of 84-85 if memory serves me correctly.


    My engine is a 86 model. Originally a Cpl 749 315 hp low flow, I converted it to Cpl 625 high flow…..


    IMG_9795.jpeg IMG_9796.jpeg
     
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  6. L9000

    L9000 Bobtail Member

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    If I swapped engines do I only need to update the radiator or other components as well ?
     
  7. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Radiator for low flow?

    What engine you dropping in it?
     
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  8. L9000

    L9000 Bobtail Member

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    I'd be going from a 444, which is low flow, to a 1982 nta 400, which is high flow. My question is, is there any difference in supporting components ?
     
  9. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    As long as the 400 is fully dressed you’ll be fine just changing the radiator and radiator hoses.

    Front section of water manifold bolted to the heads is different, rubber seals under the water manifold is different.

    The 444 wore out or blow up or….??
     
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  10. L9000

    L9000 Bobtail Member

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    Blew up. I can find 3 different engines to replace it. The nta 400 we've been discussing. A 3406A, and another 444.
    In your professional opinion, which of the 3 is the best option ?
     
    Last edited: Jun 9, 2026
    Reason for edit: Had more to say.
  11. BoxCarKidd

    BoxCarKidd Road Train Member

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    No
     
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