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Peculiar C-15MXS problem.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Diesel Dan 92, Feb 19, 2021.

  1. Feb 19, 2021 #1
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    Nov 27, 2015
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    Took of from shop loaded (160k) after a 20 minute warm up at 1000rpm at about 20°F ambient.

    few miles down road truck starts to push coolant out of the rad cap.

    Made to to destination, unload, top off coolant. Truck will run fine rest of day, maybe spits a tiny about of coolant.

    power is good and temps are normal, has done this twice now, both times leaving loaded on a cold morning. If my first run down the road is empty it doesn’t do it ??
     
    Diesel Dan 92, Feb 19, 2021
    Diesel Dan 92, Feb 19, 2021
    #1
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  3. Feb 19, 2021 #2
    little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    rad cap junk
     
    little cat 500, Feb 19, 2021
    little cat 500, Feb 19, 2021
    #2
    Diesel Dan 92 Thanks this.
  4. Feb 21, 2021 #3
    joey8686

    joey8686 Light Load Member

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    Jul 1, 2014
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    Start with rad cap, mine did that and it was a cracked head ,ended up doing a total rebuild
     
    joey8686, Feb 21, 2021
    joey8686, Feb 21, 2021
    #3
    Shawn2130 and Diesel Dan 92 Thank this.
  5. Feb 21, 2021 #4
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    Nov 27, 2015
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    :(
     
    Diesel Dan 92, Feb 21, 2021
    Diesel Dan 92, Feb 21, 2021
    #4
  7. Feb 21, 2021 #5
    Shawn2130

    Shawn2130 Heavy Load Member

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    The BXS I drive did that as well. Changed the rad cap, didn’t fix it.

    The head was cracked and pushed more coolant out the more it worked.

    Drove it that way for almost a year. Kept the engine fan going non stop to keep the coolant cooler. Didn’t push as much coolant.

    Then during winter time, did a in frame with a reman head.
     
    Shawn2130, Feb 21, 2021
    Shawn2130, Feb 21, 2021
    #5
    Diesel Dan 92 and joey8686 Thank this.
  8. Feb 23, 2021 #6
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    Nov 27, 2015
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    talked to my mech buddy, looks like that’s where we are headed (pun not intended)

    No coolant in oil so I guess I’ll keep running it for now.
     
    Diesel Dan 92, Feb 23, 2021
    Diesel Dan 92, Feb 23, 2021
    #6
    650cat425 and Shawn2130 Thank this.
  9. Feb 23, 2021 #7
    Shawn2130

    Shawn2130 Heavy Load Member

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    By the time I stopped driving the truck to do the inframe at the end of November, the truck was pushing 4 litres of coolant every 2 days. More if I worked it hard.

    Using the engine fan all the time, I noticed the truck didn’t push as much coolant.

    By the end, using the fan didn’t help anymore, even in cool November weather:

    It was time to stop driving it.
     
    Shawn2130, Feb 23, 2021
    Shawn2130, Feb 23, 2021
    #7
    650cat425 and Diesel Dan 92 Thank this.
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