Cxu613 mp8 rust on cam and rockers and pushing coolant

Discussion in 'Mack Forum' started by Edjahman, 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
     
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  3. Judge

    Judge Road Train Member

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    Getting water/antifreeze up there, probably a head gasket.
    Worse would be a cracked head.
     
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  4. Deere hunter

    Deere hunter Heavy Load Member

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    Antifreeze will not cause rust internally especially with the oil mixture. I can’t believe somebody was running straight water but very puzzling. When truck is running get half full bottle of water put the radiator tube down in see if you see air bubbles.
     
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  5. Edjahman

    Edjahman Medium Load Member

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    I'm going to look at it in a while. Mack told me that the rockers are so rusty that they have to be replaced and the cam too.
    They are talking 18K $$$

    Whats this pushing coolant mean?
    I believe they were referring to the injectors.

    Thank you
     
  6. Deere hunter

    Deere hunter Heavy Load Member

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    They just mean it’s pushing coolant into your oil and that could come from the bottom of liner packs head gasket cracked head yes also I think A Mack can push it through the injectors that would be the easiest fix.
     
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  7. Edjahman

    Edjahman Medium Load Member

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    Thank you
     
  8. Frontman

    Frontman Light Load Member

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    Is this the ...2016 Mack with 300K miles?
     
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  9. Edjahman

    Edjahman Medium Load Member

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    Yeah. Mack is saying the rust in the overhead is from sitting for a long time.

    They also said that they wanted to pull the injectors because it might need cups.

    I wonder if Peterbilt paid for the repairs would it still be a usable unit?

    I'm already 5K into it because of regular maintenance items

    Obviously I should have had the overhead looked at first so my bad on that one.

    Thanks
     
  10. Frontman

    Frontman Light Load Member

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    So, you found all these problems before you even drove the truck off there lot?
     
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  11. Edjahman

    Edjahman Medium Load Member

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    I drove it to the Mack dealer to have it serviced and evaluated.

    So I drove it a few miles.
     
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