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  1. #1
    Bobtail Member
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    Cummins isx oil in water/coolant

    Hi,
    I have a 2003 Volvo 770 with Cummins ISX 450HP engine 860K miles. A few months ago I nottice that my coolant exapansion tank is turning a little black inside and I though it's just gunk from the engine running hot during summer with heavy load in California.
    A few days ago I pulled the coolant filter out and surprize, a few drops of oil inside. In the past few moths I did 2-3 oil analisys and everything was great, no coolant in oil. Oil pressure it's ok, water temp ok, coolant level with engine cold about 1/2 of tank with engine hot full tank and some coolant in the left side of tank. There are no air bubbles in the expansion tank. No white/blue smoke, nothing besides soma blackness in the coolant tank.
    Does anybody know how this small amount of oil got into my coolant???
    Thank you.


  2. #2
    Road Train Member Heavyd's Avatar
    Member Since
    Feb 2009
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    Oil cooler housing to block gasket. They were bad for minor seepage. Where the oil leaves the filter head and goes to the block through about a 1" diameter hole the gasket seeps right there. All around the pass through is the coolant jacket. When the engine cools down the metal contract and oil seeps through to the coolant. Once warm and the metal expands again it makes a good seal, that is why the leak into the coolant is so slow. Not that bad of a job, turbo has to come off. Turbo studs and nuts probably all rusted and seized, that would be worst part. Not sure how great the access would be on a volvo, but I would guess around 6 hours labor.

  3. #3
    Light Load Member
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    i had the same problem and it was my oil cooler

  4. #4
    Bobtail Member
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    for an oil cooler, it would be about 10 hours labor...maybe a bit cheaper since on a 770. that is one hell of a bill i know, especially since my shop charges 110/hr

  5. #5
    Bobtail Member
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    I just got my truck out from the Volvo dealer and they found a bad oil cooler. The bill was almost 2000 but I had everything replaced, coolant, coolant filter, oil cooler, expansion tank and two flushes. Thank you all for your answers.

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