Oil Cooler 6NZ

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Smellfunny, Apr 13, 2024.

  1. Smellfunny

    Smellfunny Road Train Member

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    Doing a oil cooler on a 6NZ and when I took the old one off this is what it looked like. I have done a few over the years but never seen one that looked like this. It was mixing oil into the coolant. So I am going to flush.
    Customer has been running green coolant and wants to go back with Red ELC. What are your opinions on this? Truck shows 800k on the odometer. Probably 1.8 million.
     

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  3. Deere hunter

    Deere hunter Road Train Member

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    Looks like there were some kind of an object in there, rolling around, rubbing on that for a long time!
     
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  4. Smellfunny

    Smellfunny Road Train Member

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    That’s what I thought as well but I did not see anything. Will look closer Monday.
     
  5. W923

    W923 Road Train Member

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    Never seen one look that way…all the tubes are usually very close in length and square ended. Can you tell if it’s some cheap aftermarket or maybe the pictures just make it look weird
     
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  6. skallagrime

    skallagrime Road Train Member

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    Running red elc in my 3406e since its rebuild about 500k ? Ago. Actual differences... not much that i could really tell, but for me at least it shows up easier if it leaks (leaves that white residue)
     
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  7. Smellfunny

    Smellfunny Road Train Member

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    It has what appears to be a cat sticker on it. You can't read it anymore. The one thing that we found odd was that there was anti-seize on the 4 bolts that hold it in place. Fresh anti-seize. Maybe he had a water pump go bad and someone damaged it then. I will ask the customer when I see him.
     
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  8. Smellfunny

    Smellfunny Road Train Member

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    Yeah just wondering if there will be any issues if this thing has been running green since day 1 and I switch to ELC.
     
  9. Smellfunny

    Smellfunny Road Train Member

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    No it is bowl shaped in the end. Even some of the tubes are angled. I would say weirdest thing I ever saw but that would not be true. This is the same customer that had the truck catch on fire a week or so back while it was just sitting in our yard.
     
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  10. skallagrime

    skallagrime Road Train Member

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    Nah, wouldnt worry about that
     
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