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24 valve cummins

Discussion in 'Trucks' started by Mike L, Mar 21, 2020.

  1. Mike L

    Mike L Senior Member

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    my service truck has said motor in it. Truck has 320k on the odometer and shows 21k hrs on the ecm. Motor is tired and I’m suspicious that it’s not original anyway. Low power, fair amount of blowby, oil consumption, gets warm in the hills, etc. it’s getting time to replace. The truck is from the south and it in very good shape for the year. Definitely worth a new engine. I’m not going to rebuild it. The motor doesn’t have removable liners and I don’t have time to pull it and get the block machined. I called cummins and they quoted me 14k with a 4K core. I’ve found a few engine outfits on the interweb that advertise these engines already rebuilt with a 3 yr 75k mile warranty for around $4500. I’m a firm believer that if it sounds too good to be true it probably is. Why such a difference in price and does anyone have any experience with buying an engine from an outfit like this?
     
  2. 92U 3406

    92U 3406 Senior Member

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    My guess would be aftermarket parts vs Cummins parts.
     
  3. Truck Shop

    Truck Shop Senior Member

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    Post the Ads for the 45 dollar engines so we can take a look, please.
     
    Spud_Monkey likes this.
  4. Mike L

    Mike L Senior Member

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  5. funwithfuel

    funwithfuel Senior Member

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    With Cummins, you can go to any Cummins authorized dealer. Navistar, Paccar, Ford or even Dodge and Cummins themselves for warranty and service. Don't know about the lesser known (cheaper) replacement.
    I'm guessing it's a 230HP model, getting used to less than half of its engineered power level. I'd bet a nickel, a set of bearings and re-ringing the original pistons would bring that old girl right back in line. That's just the cheap-@ss hillbilly in me talking, sometimes he makes a good point:)

    Timing chain? 3 angle valve job?
     
  6. Mike L

    Mike L Senior Member

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    It’s set at 260 hp. I’m sure a set of rings would help some but I have a hard time convincing myself to put new pistons in oval holes.
     
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  7. RollOver Pete

    RollOver Pete Senior Member

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  8. Mike L

    Mike L Senior Member

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    There’s plenty of places selling them but I just wonder about longevity and if they stand behind their warranty.
     
  9. Truck Shop

    Truck Shop Senior Member

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    Well at $4,750=$791 bucks per hole. $14,000=$2,333 bucks per hole. Either way for a small six banger that's steep, average parts cost to inframe a C-15 Cat is $11,000.
    I just installed a after market inframe kit in a Cummins Big Cam IV block-$1,200 bucks=$200 bucks per hole. I have a problem with companies that have racing or performance in their name
    when it comes diesel engines. JMHO.
     
  10. Tenwheeler

    Tenwheeler Senior Member

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    I have used some from Jasper when I had basket cases and or was in a bind. I am not selling anything! Put an 8.3 in a Ford and the last thing to be done was remove the tape on top of the head and install the intake cover. It had the wrong head. They worked it out with an agreement.
    Had a tractor engine bored .040 ( Largest oversize ) but it still had oval holes. It is still running 15 years later just has some blow by.
    5.9's often do not have bad cylinder wear at that mileage. Never know until the head is off.
     
    Truck Shop likes this.
  11. Truck Shop

    Truck Shop Senior Member

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    Don't try to roll main bearings in a 8.3.
     
  12. mitch504

    mitch504 Senior Member

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    Why? never tried it, just curious.
     
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  13. RZucker

    RZucker Senior Member

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    Possibility of loose piston cooling nozzles?
     
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  14. Truck Shop

    Truck Shop Senior Member

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    Correct, the piston cooling nozzles are made of plastic and are fitted in the main bearing upper bosses. The plastic nozzles can shrink slightly from heat and time, if upper bearing is removed
    while engine is still in the frame the nozzle can slide down after the bearing is removed, blocking the way for the installation of the new bearing. Then its engine removal and crank out.
     
    check, Tenwheeler and RZucker like this.
  15. DB2

    DB2 Senior Member

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    My father’s favorite adage of “Cummapart” rings true again. LOL

    This time however it’s now it has to come apart to fix it.
     
    Last edited: Mar 22, 2020
    Truck Shop likes this.
  16. Birken Vogt

    Birken Vogt Charter Member

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    In their proper application, I think the 5.9 and 8.3 Cummins were/are about the best thing going.

    Sure they have their problems, but if you want an engine that just starts and makes money most every day, they seem to be the best choice among the choices available.

    What else are you going to use? Cat C7? Was a dirty word around here. Mercedes Benz? International? They make a kit to replace those with Cummins now.
     
  17. Truck Shop

    Truck Shop Senior Member

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    Here's the thing about the 8.3 if taken care of properly, even with 300,000 plus miles the crank bearings are probably OK.
     
  18. Birken Vogt

    Birken Vogt Charter Member

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    My experience is in vocational trucks and in my experience the whole truck will be falling to pieces and the 8.3 will still be in decent condition which is all the service it needs to give anyway.
     
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  19. Truck Shop

    Truck Shop Senior Member

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    Unless it's removed and installed in another frame and runs 200,000 more.
     
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  20. RZucker

    RZucker Senior Member

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    A lot like the early 5.9's in the 1st generation Dodge bodies. Dodge should have offered a glider kit. :D