Maxxforce 13 Oil in coolant, no oil pressure

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Auralogi, Jul 9, 2020.

  1. Auralogi

    Auralogi Bobtail Member

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    Hi everyone,

    I have a 2013 Prostar with a Maxxforce 13. I'll get this out of the way by saying I know its a piece of #### truck, but its my piece of #### and I have to deal with it so please spare me that lecture. I bought the truck in august of last year with 400k miles on it. It was running good up until around Feb. of this year when it started eating coolant with no visible leaks. A lot of coolant, about a gallon every 200-300 miles. I limped it on for the rest of the week then had it parked, and my first thought was a blown head gasket but there was no coolant in the oil, no smoke coming out of the stack. No other symptoms other than its losing a lot of coolant internally. I left it sitting for a few weeks while using another truck. When I got back to it I noticed it has what looks like oil in the coolant resevoir, and now when I start it up it immediately tells me there is no oil pressure, and it shuts itself down after about a minute. I'm not entirely sure where to start with this thing. I've had one guy tell me it sounds like a very bad case of blowby, and I need rings, pistons, all that jazz. What do you guys think? Is it worth the trouble? I refuse to take it to Rush Truck Center (dealer in my area) they're a total rip off. I don't mind tearing into it myself, can't break it anymore than it already is. Thanks for the help ya'll.
     
    stillwurkin and bzinger Thank this.
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  3. Judge

    Judge Road Train Member

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  4. Heavyd

    Heavyd Road Train Member

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    Coolant loss is most likely a failed egr cooler. The black staining in your coolant reservoir needs to be checked further. It is common with egr cooler failures that are not fixed right away for soot to get blown into the coolant and make it's way to the reservoir and stain it. The soot more or less just coats the inside of the plastic and really doesn't mix with the coolant. Engine oil has different physical characteristics so it forms different. It will float on top of the coolant and partially mix with it to form a sludge in there. To further confirm a failed egr cooler, remove the intake pipe at the intake throttle valve and look inside where the egr mixing pipes connect. It will be soaked with coolant in there coming in from the egr cooler. The oil pressure issue would need further diag, and best to install a mechanical pressure gauge where the sensor is to make sure it has pressure or not.
     
    Flipsmurf and Auralogi Thank this.
  5. Auralogi

    Auralogi Bobtail Member

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    Thanks for the info sir. I'll start with the steps you mentioned, and respond back when I know more.
     
  6. Auralogi

    Auralogi Bobtail Member

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    @Heavyd So I fiddled with it some more today. Surprisingly it was able to maintain oil pressure today and stay running. I’m trying to locate the intake pipe. Is that on the top side of the engine bay or on the passenger side of the engine bay?
     
  7. Heavyd

    Heavyd Road Train Member

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    Drivers side big pipe going to the engine is your intake.
     
  8. Auralogi

    Auralogi Bobtail Member

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    image.jpg

    Is this the intake pipe, and the mixing pipes are there in the back of the photo? @Heavyd
     
  9. Auralogi

    Auralogi Bobtail Member

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    Ok i got the pipe off and theres definitely coolant right past the throttle body, ill send a picture in just a sec.
     
    Last edited: Jul 17, 2020
  10. Auralogi

    Auralogi Bobtail Member

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  11. Heavyd

    Heavyd Road Train Member

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