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F134 Oil Pressure Rising

Discussion in 'Early CJ5 and CJ6 Tech' started by Bill67cj5, Jan 10, 2019.

  1. Bill67cj5

    Bill67cj5 Member

    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
     
    Bill67cj5, Jan 10, 2019
    #1
  2. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Verified with a different gauge?
     
    Howard Eisenhauer, Jan 10, 2019
    #2
  3. Bill67cj5

    Bill67cj5 Member

    No. Guess I’ll have to go get one
     
    Bill67cj5, Jan 10, 2019
    #3
  4. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Colder (outside air) temps?
     
    ITLKSEZ, Jan 10, 2019
    #4
  5. Bill67cj5

    Bill67cj5 Member

    definitely much colder...high of 35 today.
     
    Bill67cj5, Jan 10, 2019
    #5
  6. radshooter

    radshooter Member

    Will cold weather raise the viscosity enough to do that? Or would the warm engine negate the cold air and keep viscosity normal?
     
    radshooter, Jan 10, 2019
    #6
  7. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    At startup it would, but it would drop again when the engine warms up.
     
    ITLKSEZ, Jan 10, 2019
    #7
  8. 1960willyscj5

    1960willyscj5 Well-Known Member

    what weight oil are you using?
     
    1960willyscj5, Jan 13, 2019
    #8
  9. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    If the gauge is electrical, check the wiring and connections, you may be getting false readings from excess resistance.
     
    PeteL, Jan 13, 2019
    #9
  10. Glenn

    Glenn Kinda grumpy old man Staff Member

    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?
     
    Glenn, Jan 14, 2019
    #10