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Detroit 12.7 issues, cracked exhaust center sections

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by j.r.1981, Mar 19, 2021.

Page 4 of 5
  1. Mar 22, 2021 #31
    jamespmack

    jamespmack Road Train Member

    20,034
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    Mar 25, 2014
    OH
    0
    Well you seem to have multiple problems. Sounds like it will be solved. The CAC is your fuel milage and manifold issue.
     
    jamespmack, Mar 22, 2021
    jamespmack, Mar 22, 2021
    #31
    Rideandrepair, j.r.1981 and AModelCat Thank this.
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  3. Mar 22, 2021 #32
    AModelCat

    AModelCat Road Train Member

    29,418
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    Jul 7, 2015
    Canuckistan
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    I bet getting that fixed will make a huge difference.
     
    AModelCat, Mar 22, 2021
    AModelCat, Mar 22, 2021
    #32
    Rideandrepair, j.r.1981 and jamespmack Thank this.
  4. Mar 22, 2021 #33
    jamespmack

    jamespmack Road Train Member

    20,034
    216,333
    Mar 25, 2014
    OH
    0

    At 46, or 47 psi I had a stock CAC open up. Sounded like a hand grenade under the hood went off. Looked like it too.
     
    jamespmack, Mar 22, 2021
    jamespmack, Mar 22, 2021
    #33
    Rideandrepair, j.r.1981 and AModelCat Thank this.
  5. Mar 23, 2021 #34
    Rideandrepair

    Rideandrepair Road Train Member

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    Aug 8, 2015
    0
    We had to modify the holes on the bottom of the radiator from American. Had to slot them out a little. One of the bottom mounting nuts on passenger side was pretty hard to get a wrench on. Had to jam a prybar on it from the bottom, and tighten the bolt from the top. Takes 2 people. Just a heads up. Exact same Truck.
     
    Rideandrepair, Mar 23, 2021
    Rideandrepair, Mar 23, 2021
    #34
    jamespmack and j.r.1981 Thank this.
  7. Mar 23, 2021 #35
    Rideandrepair

    Rideandrepair Road Train Member

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    Hopefully this fixes all your issues. If the black smoke continues. Maybe the ecm has been changed . Pulse width on injectors set too long? Or a bad injector, dumping fuel? I don’t know much about it, but have heard of this being done. Truck runs very strong, till it blows up.
     
    Rideandrepair, Mar 23, 2021
    Rideandrepair, Mar 23, 2021
    #35
    j.r.1981 Thanks this.
  8. Apr 3, 2021 #36
    j.r.1981

    j.r.1981 Light Load Member

    113
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    Aug 22, 2012
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    I think I got my issues sorted out. Got all the new parts installed, and test ran the truck. It smokes a little still but it's not rolling coal like it was. I haven't had a load behind it yet, but even just driving it bobtail it's not smoking like it did. Oil and coolant temps are lower also. Waiting for a new pyro and boost gauge before I pull anything so I can keep an eye on it. Again, thanks for everyones help and suggestions. I'll update this again when I pull a load with it
     
    j.r.1981, Apr 3, 2021
    j.r.1981, Apr 3, 2021
    #36
    jamespmack and Rideandrepair Thank this.
  9. Apr 16, 2021 #37
    j.r.1981

    j.r.1981 Light Load Member

    113
    96
    Aug 22, 2012
    0
    Finally got my truck out on the road Monday. Wichita,ks to Las Vegas, nv. After all the repairs, it ran awesome..78,000 gross, 5.5 mpg, coolant never got over 180° except on long pulls, egt never got over 1100°, 45 psi boost. I guess it's fixed..
     
    j.r.1981, Apr 16, 2021
    j.r.1981, Apr 16, 2021
    #37
    jamespmack and Rideandrepair Thank this.
  10. Apr 16, 2021 #38
    Rideandrepair

    Rideandrepair Road Train Member

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    45lbs boost! I can’t get any more than 35. That’s great!
     
    Rideandrepair, Apr 16, 2021
    Rideandrepair, Apr 16, 2021
    #38
    jamespmack and j.r.1981 Thank this.
  11. Apr 17, 2021 #39
    tommymonza

    tommymonza Road Train Member

    4,519
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    Sep 10, 2013
    S.W. Florida
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    Just reading this over. Radiator $950 and over flow tank $200 correct.

    Sounds like a heck of a deal on the radiator.
     
    tommymonza, Apr 17, 2021
    tommymonza, Apr 17, 2021
    #39
    Rideandrepair and j.r.1981 Thank this.
  12. Apr 17, 2021 #40
    j.r.1981

    j.r.1981 Light Load Member

    113
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    Aug 22, 2012
    0
    Sounds about right, I paid less than what the website said. I don't know if they gave me a discount because of everything I bought or what. Radiator, surge tank, bar and plate cac, 2 stainless coolant tubes, and ac condenser. Total was $2450.00 or right around there.
     
    j.r.1981, Apr 17, 2021
    j.r.1981, Apr 17, 2021
    #40
    tommymonza and Rideandrepair Thank this.
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