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Where is This Oil Leak Coming From?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by PE_T, Jan 31, 2020.

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  1. Jan 31, 2020 #1
    PE_T

    PE_T Road Train Member

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    I just found this minor leak on the oil filter housing. It’s hard to see where exactly it’s leaking from. This is on a 2014 Freightliner Cascadia with a DD15.
     

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    PE_T, Jan 31, 2020
    PE_T, Jan 31, 2020
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  3. Jan 31, 2020 #2
    062

    062 Road Train Member

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    062, Jan 31, 2020
    062, Jan 31, 2020
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    PE_T Thanks this.
  4. Jan 31, 2020 #3
    buddyd157

    buddyd157 Road Train Member

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    almost looks like some sort of "ball plug", that is used to plug up a hole(s) when the casting is drilled out for passage ways.

    at least, in one of those pics, looks like a ball plug.(the one pic where you used a mirror)
     
    buddyd157, Jan 31, 2020
    buddyd157, Jan 31, 2020
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  5. Jan 31, 2020 #4
    mhyn

    mhyn Road Train Member

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    all dd15s one day will leak there... unscrew that cup and replace the o-ring. p/n DDE A4729970145
    that piece is called oil temperature regulator.
     
    mhyn, Jan 31, 2020
    mhyn, Jan 31, 2020
    #4
    Rideandrepair, 062, bzinger and 2 others Thank this.
  7. Jan 31, 2020 #5
    PE_T

    PE_T Road Train Member

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    Thank you very much!
     
    PE_T, Jan 31, 2020
    PE_T, Jan 31, 2020
    #5
    spsauerland and mhyn Thank this.
  8. Jan 31, 2020 #6
    mhyn

    mhyn Road Train Member

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    you are welcome.
     
    mhyn, Jan 31, 2020
    mhyn, Jan 31, 2020
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    062, bzinger and PE_T Thank this.
  9. Feb 2, 2020 #7
    ast26909

    ast26909 Medium Load Member

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    While we are at oil leaks, is this leaking from head gasket? 2013 DD13 with 350k miles.

    20200202_164254_HDR.jpg
     
    ast26909, Feb 2, 2020
    ast26909, Feb 2, 2020
    #7
  10. Feb 2, 2020 #8
    mhyn

    mhyn Road Train Member

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    most likely camshaft housing gasket could be valve cover gasket too..
     
    mhyn, Feb 2, 2020
    mhyn, Feb 2, 2020
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  11. Feb 2, 2020 #9
    ast26909

    ast26909 Medium Load Member

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    I can confirm it's not valve cover gasket, the camshaft housing gasket have you done one? If yes, does the exhaust and intake manifolds have to be removed?
     
    ast26909, Feb 2, 2020
    ast26909, Feb 2, 2020
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  12. Feb 2, 2020 #10
    mhyn

    mhyn Road Train Member

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    I have done it many times. not easy. No manifolds will need to come off...
     
    mhyn, Feb 2, 2020
    mhyn, Feb 2, 2020
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