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Mack cxu613 2016 mp8 rust on cam and rockers

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Edjahman, Jun 16, 2020.

  1. Jun 16, 2020 #1
    Edjahman

    Edjahman Medium Load Member

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    So I just had the valve covers pulled to have the overhead adjusted and mack said that the camshaft and the rockers have rust.

    They also said that it saw signs of pushing coolant but I don't know what that means.

    What causes this?

    Thank you
     
    Edjahman, Jun 16, 2020
    Edjahman, Jun 16, 2020
    #1
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  3. Jun 16, 2020 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    What do you know of its history. Have you been adding coolant?
     
    BoxCarKidd, Jun 16, 2020
    BoxCarKidd, Jun 16, 2020
    #2
    Rideandrepair and Edjahman Thank this.
  4. Jun 16, 2020 #3
    Edjahman

    Edjahman Medium Load Member

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    I gave up and ran away from that tractor.

    Thank you for asking though!
     
    Edjahman, Jun 16, 2020
    Edjahman, Jun 16, 2020
    #3
    Rideandrepair Thanks this.
  5. Jun 16, 2020 #4
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Sounds like you have chosen wisely.
     
    BoxCarKidd, Jun 16, 2020
    BoxCarKidd, Jun 16, 2020
    #4
    Rideandrepair, AModelCat and Edjahman Thank this.
  7. Jun 16, 2020 #5
    Edjahman

    Edjahman Medium Load Member

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    Yeah hopefully.

    Buying a used tractor is quite the ordeal.
     
    Edjahman, Jun 16, 2020
    Edjahman, Jun 16, 2020
    #5
    Rideandrepair and BoxCarKidd Thank this.
  8. Jun 17, 2020 #6
    Rideandrepair

    Rideandrepair Road Train Member

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    All these newer engines seem to have their own unique problems. For what it’s worth, I’ve been told, by an Engineer at Detroit, that since 2017, they’ve made good advances with emissions. Somewhat caught up with the Government mandate. I don’t know, if the engines he’s referring to are in 2017, or 2018 Trucks. But coming straight from a Guy whose Job is working out bugs in the system. It’s worth a little research, if you do consider a Detroit. Seems either real new, or real old. 2006-7 through 2016-17, just seem plagued with huge repair bills, after 500k.
     
    Rideandrepair, Jun 17, 2020
    Rideandrepair, Jun 17, 2020
    #6
    BoxCarKidd, lwlevens and Edjahman Thank this.
  9. Jun 27, 2020 #7
    SergeyN

    SergeyN Bobtail Member

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    mp8 is not detroit, the presence of coolant in the system is determined by the test, this is bad, but it seems to be covered by the manufacturer’s waranty
     
    SergeyN, Jun 27, 2020
    SergeyN, Jun 27, 2020
    #7
    Edjahman Thanks this.
  10. Jun 27, 2020 #8
    Edjahman

    Edjahman Medium Load Member

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    The used truck dealer was trying to say that it was no big deal but it scared me anyway.

    I've never seen rust in the overhead.

    I bought a 579 anyway and I love it so it's irrelevant.

    I would've bought the Mack. It only had 313K miles so that seemed like a red flag also.

    Why were they getting rid of it at 313 K?

    Thanks
     
    Edjahman, Jun 27, 2020
    Edjahman, Jun 27, 2020
    #8
    Rideandrepair Thanks this.
  11. Jun 27, 2020 #9
    SergeyN

    SergeyN Bobtail Member

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    you made the right choice - I suggested a possible option, but in any case it’s repair and time
     
    SergeyN, Jun 27, 2020
    SergeyN, Jun 27, 2020
    #9
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