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Dauntless 225 Oil Pressure

Discussion in 'Early CJ5 and CJ6 Tech' started by ucdaniel, Dec 12, 2013.

  1. ucdaniel

    ucdaniel New Member

    I have a '69 CJ5 with a 225 in it. At hot idle my oil pressure is running right around 15psi, and climbs up to around the 40-45psi range when revving up. I was just wondering what the rest of you guys have as far as idle oil pressure in your 225's, or if I need to check out the oil press relief valve. BTW I'm running 10w-40 in it right now, new manual oil press. gauge, compression good on all cylinders, etc.
     
    ucdaniel, Dec 12, 2013
    #1
  2. DayLucas

    DayLucas Wrench it

    When I did my timing chain I bought a new oil pump also. I had 3 springs to choose from for my psi on oil. I went with the white spring. What I ended up with is cold start around 50/60 when below zero outside. Once worm and idle 650rpm/750rpm is around 15/20 psi. 10w30. Motor has around 32000 miles on it.
     
    DayLucas, Dec 12, 2013
    #2
  3. Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Rule of thumb is 10lbs per thousand rpm. Your idle psi of 15 is well within the ball park.
     
    Walt Couch, Dec 12, 2013
    #3
  4. Danefraz

    Danefraz Well-Known Member 2023 Sponsor 2022 Sponsor

    Excellent information.


    Sent from my iPhone using Tapatalk
     
    Danefraz, Dec 12, 2013
    #4
  5. ucdaniel

    ucdaniel New Member

    Ok, thanks guys. Just wondering if it was something I should check out.
     
    ucdaniel, Dec 12, 2013
    #5
  6. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Thanks for the question and information - I replaced a leaky, non-functioning aftermarket mechanical gauge and have been reading pretty much the same pressures as ucdaniel and wondering if I should be concerned. Seems like I can focus my worry on all the other issues now.
     
    FinoCJ, Dec 12, 2013
    #6
  7. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    What brand of oil filter are you running?

    Not sure if this applies to the 225, but the popular orange brand typically gives you a lower hot idle OP than some more well regarded brands. There's a lot of info on the net about oil filter brands.
     
    timgr, Dec 12, 2013
    #7
  8. Daryl

    Daryl Sponsor

    Buick v-6s are well known for having low oil pressure at hot idle. 15 pounds is more then most for sure especially if it has never been rebuilt.
     
    Daryl, Dec 12, 2013
    #8
  9. djbutler

    djbutler Sponsor

    Your stated oil pressure is just about the same as in my Yellow Barn Find Jeep with unknown mileage on what appeared to be an original D225 engine. No worries mate...

    Don
     
    djbutler, Dec 13, 2013
    #9
  10. Fhead134

    Fhead134 New Member

    If it ain't knockin', keep on rockin'.
     
    Fhead134, Dec 15, 2013
    #10