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Coolant in tanks DD15

Discussion in 'Freightliner Forum' started by shall, Mar 12, 2025.

  1. Mar 12, 2025 #1
    shall

    shall Bobtail Member

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    Mar 12, 2025
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    So Im running a 2016 Coronado with a DD15 and RR18 box. Getting coolant in the tanks and filters. I'm assuming it's from injector cup failure. Before I take the plunge and pull the head off is there any other way it can get there.
    Thought maybe it has a liquid fuel cooler but that seems to be an air cooled unit on the chassis under the cab.
    The fuel filter housing on the side of the engine has many hoses into and out of it, any of those coolant?
    Basically grabbing at straws here as not too keen on doing an engine teardown at the peak of the grain carting season.
    Thanks in advance for any advice.
     
    shall, Mar 12, 2025
    shall, Mar 12, 2025
    #1
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  3. Apr 16, 2025 at 8:52 PM #2
    Rideandrepair

    Rideandrepair Road Train Member

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    Aug 8, 2015
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    Don’t know about DD 15, but on a 14 cups can be changed without pulling head. 12.7&11.1 have to pull head. Check it out. Maybe a bad injector O ring? Usually return fuel from head to tanks heats the fuel. Trucks used to have coolant lines running through tanks for heating. Fuel cooler? The air cooler you’re looking at is probably the transmission cooler. Follow the lines. Most likely has trans oil running through it. Some have coolant and will leak into the transmission. Never heard of anything similar for cooling fuel.
     
    Last edited: Apr 16, 2025 at 9:02 PM
    Rideandrepair, Apr 16, 2025 at 8:52 PM
    Rideandrepair, Apr 16, 2025 at 8:52 PM
    #2
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