oil in radiator 3406e

Discussion in 'Trucks [ Eighteen Wheelers ]' started by k whopper, Sep 2, 2013.

  1. k whopper

    k whopper Light Load Member

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    Sep 9, 2011
    milledgeville ga
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    found oil in my radiator it not pushing it out though there was a little water on the oil fill cap but not on dip stick and i do not see any in the blow by tube but had to add a gallon of water last week
     
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  3. maxicruise

    maxicruise Light Load Member

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    Aug 11, 2010
    Illinois
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    Oil Cooler, how long has it been since it was changed?
     
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  4. little cat 500

    little cat 500 Road Train Member

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    Abbottstown PA
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    could be a head gasket i just had one do just that 8000 dollars later its back on the road
     
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  5. Heavyd

    Heavyd Road Train Member

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    +1 on the oil cooler. Do the cheaper stuff first.
     
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  6. RJC

    RJC Bobtail Member

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    Jul 26, 2011
    Dothan,Alabama
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    Also could be transmission cooler if your's is water cooled. Transmission oil in the radiator will have a reddish brown tint.
     
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  7. k whopper

    k whopper Light Load Member

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    Sep 9, 2011
    milledgeville ga
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    oil cooler have not been changed in the two years that I had it truck had 850000 mile on it place I got it from said it been rebuilt at some time but no papers so I don't know if cooler what causes the water loss
     
  8. k whopper

    k whopper Light Load Member

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    Sep 9, 2011
    milledgeville ga
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    its air cooled thanks
     
  9. little cat 500

    little cat 500 Road Train Member

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    Abbottstown PA
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    id still go with head gasket or cracked head
     
  10. Heavyd

    Heavyd Road Train Member

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    Most rebuilds do not include replacing the oil cooler. 99% oil cooler, 1% head or head gasket problem.
     
  11. Superhauler

    Superhauler TEACHER OF MEN

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    yeah I lean toward oil cooler. oil pressure is more than water pressure so oil will show up in radiator. when not running some water can push in to oil side due to no oil pressure.
     
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