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Oil leak @ head gasket...hmmm.

Discussion in 'Peterbilt Forum' started by DocHoof, Feb 1, 2015.

  1. Feb 1, 2015 #1
    DocHoof

    DocHoof Light Load Member

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    So, I noticed this a few days ago and have kept a watchful eye and decided to get some advice. Cat C15 with about 325k on it (figures, warranty expired at 300k). Oil bubbles appeared on the drivers side about where the 4th cylinder is between the block and head. When I say bubbles, I mean it literally; at idle, about every 15 seconds, an oil bubble rises for about 2 seconds, then pops. Oil is not streaking out of the leak, but since seeing it there is a small trail of oil about 7" long down the side of the block . No oil in water or water in oil. Pressure runs 80 psi at cold, drops to 60 once warm. Runs at 80 above 1000 rpm and 85 over 1250. Water temp stays 150ish, oil temp 125. Manifold pressure runs like nornal, no drops, loss or excess pressure. No loss of power, no misfirres. Should I be worried or just slap some JB Weld over it and carry on?
     
    DocHoof, Feb 1, 2015
    DocHoof, Feb 1, 2015
    #1
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  3. Feb 1, 2015 #2
    dieselfuelonly

    dieselfuelonly Road Train Member

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    My C15 does something similar, but on the driver side of cylinder #6. Almost looks like a little bit of "fizz". No oil in coolant or vice versa, uses/leaks almost no oil... runs like a top... me, I'm just gonna keep on running it for the time being.
     
    dieselfuelonly, Feb 1, 2015
    dieselfuelonly, Feb 1, 2015
    #2
  4. Feb 1, 2015 #3
    062

    062 Road Train Member

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    150 for the water temp,is hard on the motor. Unless your in some pretty cold weather. Sounds like time for new thermostats.
     
    062, Feb 1, 2015
    062, Feb 1, 2015
    #3
  5. Feb 1, 2015 #4
    tnevin225

    tnevin225 Road Train Member

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    Just wondering why low water temp would be hard on motor?:biggrin_2556:
     
    tnevin225, Feb 1, 2015
    tnevin225, Feb 1, 2015
    #4
  7. Feb 1, 2015 #5
    lester

    lester Midwest's #1 Feed Hauler

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    Doesn't get complete fuel burn in cylinders, oil temp isn't warm enough to burn out any fuel and water. Something like that anyway.
     
    lester, Feb 1, 2015
    lester, Feb 1, 2015
    #5
  8. Feb 1, 2015 #6
    beemergary

    beemergary Light Load Member

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    Like lester says. Cool air and fuel (higher density-more oxygen) gives more power But has to been in a warm environment.
     
    beemergary, Feb 1, 2015
    beemergary, Feb 1, 2015
    #6
  9. Feb 1, 2015 #7
    DocHoof

    DocHoof Light Load Member

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    Oh jeez...I'm an idiot. I looked at my water temp guage. There is a line between the 150 and 200. It runs right there. So I'd say 175°? Must have had an anal/cranial inversion when I wrote "150". But back to the original question...should I be concerned about the OIL LEAK???
     
    DocHoof, Feb 1, 2015
    DocHoof, Feb 1, 2015
    #7
  10. Feb 1, 2015 #8
    lester

    lester Midwest's #1 Feed Hauler

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    175 is still to cool.
     
    lester, Feb 1, 2015
    lester, Feb 1, 2015
    #8
  11. Feb 1, 2015 #9
    062

    062 Road Train Member

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    At 175 could be the gauge is off that much. If you have a temp gun,take a reading at the thermostat,see what you have there. As for the leak never have seen one fix its self. If you have a large torque wrench,check the head bolts.
     
    062, Feb 1, 2015
    062, Feb 1, 2015
    #9
  12. Feb 1, 2015 #10
    lester

    lester Midwest's #1 Feed Hauler

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    Yeah I changed my thermostats a few years ago, which turned in to a full day project, only to discover afterwards sending unit was bad
     
    lester, Feb 1, 2015
    lester, Feb 1, 2015
    #10
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