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F134 Oil Pressure Rising

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Bill67cj5, Jan 10, 2019.

  1. Jan 10, 2019
    Bill67cj5

    Bill67cj5 Sponsor Sponsor

    Franklin, TN
    Joined:
    Apr 12, 2014
    Messages:
    71
    noticed that the oil pressure on my 67 F134 is higher than it used to be. At idle (warm) we used to sit at about 10 psi, now closer to 20. at 45 mph used to be about 40-45 and now is more like 55. also, although maybe a coincidence I have developed a leak around the valve cover at the right rear corner. I replaced the valve cover gasket 4 years/4000 miles ago. Engine was rebuilt 5000 miles ago.
    looked at strings on oil pressure but they all seem to discuss lower oil pressure, not higher.
    Ideas?
    thx, bh
     
  2. Jan 10, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
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    5,375
    Verified with a different gauge?
     
  3. Jan 10, 2019
    Bill67cj5

    Bill67cj5 Sponsor Sponsor

    Franklin, TN
    Joined:
    Apr 12, 2014
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    No. Guess I’ll have to go get one
     
  4. Jan 10, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    Aug 13, 2015
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    Colder (outside air) temps?
     
  5. Jan 10, 2019
    Bill67cj5

    Bill67cj5 Sponsor Sponsor

    Franklin, TN
    Joined:
    Apr 12, 2014
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    definitely much colder...high of 35 today.
     
  6. Jan 10, 2019
    radshooter

    radshooter Member

    Northern Arizona
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    Jan 10, 2014
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    118
    Will cold weather raise the viscosity enough to do that? Or would the warm engine negate the cold air and keep viscosity normal?
     
  7. Jan 10, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
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    At startup it would, but it would drop again when the engine warms up.
     
  8. Jan 13, 2019
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
    Joined:
    Nov 27, 2006
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    what weight oil are you using?
     
  9. Jan 13, 2019
    PeteL

    PeteL Member Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    6,084
    If the gauge is electrical, check the wiring and connections, you may be getting false readings from excess resistance.
     
  10. Jan 14, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    8,387
    The answer to this question could be the key.....but 10 lbs pressure difference isn't much really. Another question is how long has the engine run while you're seeing the pressure difference? 30 minutes? 45 minutes? An hour? More?
     

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