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Isx oil pressure low?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Vivaspin, Dec 19, 2020.

Page 1 of 2
  1. Dec 19, 2020 #1
    Vivaspin

    Vivaspin Bobtail Member

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    Hello I have an international prostar with Cummins ISX and about 900,000 miles has had in frame overhaul about 250,000 miles ago

    I have had this truck for the past hundred thousand miles and my oil pressure has always shown between 28-31psi cruising 70mph. Idle 12-13 psi

    Has a lot of power and no issues. I just
    Want to know if this is normal oil pressure or should I replace some thing
     
    Vivaspin, Dec 19, 2020
    Vivaspin, Dec 19, 2020
    #1
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  3. Dec 19, 2020 #2
    Vivaspin

    Vivaspin Bobtail Member

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    115B1352-66A5-4C59-8947-48AA9567461F.jpeg
     
    Vivaspin, Dec 19, 2020
    Vivaspin, Dec 19, 2020
    #2
  4. Dec 19, 2020 #3
    AModelCat

    AModelCat Road Train Member

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    If its been like that for 100k and no problems, why worry now?
     
    AModelCat, Dec 19, 2020
    AModelCat, Dec 19, 2020
    #3
  5. Dec 19, 2020 #4
    olddog_newtricks

    olddog_newtricks Medium Load Member

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    I have an ISX cm 2350 Mine holds 40 - 45 cruising at 70 mph. And around 25 at idle. It has 610,xxx. On it.
     
    olddog_newtricks, Dec 19, 2020
    olddog_newtricks, Dec 19, 2020
    #4
  7. Dec 19, 2020 #5
    Vivaspin

    Vivaspin Bobtail Member

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    i drove a buddys prostar last week same engine cm871, he was getting 35-37 psi at 70mph.
     
    Vivaspin, Dec 19, 2020
    Vivaspin, Dec 19, 2020
    #5
  8. Dec 19, 2020 #6
    Vivaspin

    Vivaspin Bobtail Member

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    Oct 2, 2020
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    Yea im getting nowhere near that.

    cold engine: idle 30psi and at 70mph i get 40psi
    Warm engine: idle 12-13 and at 70mph i get 28-31psi
     
    Vivaspin, Dec 19, 2020
    Vivaspin, Dec 19, 2020
    #6
  9. Dec 19, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    Put a proper gauge on it first before you panic. Dash gauges aren't really accurate.

    70 mph means nothing. Oil pressure is RPM dependant.
     
    AModelCat, Dec 19, 2020
    AModelCat, Dec 19, 2020
    #7
    jbatmick and bzinger Thank this.
  10. Dec 19, 2020 #8
    Concorde

    Concorde Road Train Member

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    2021 Cummins 565hp..@850 rpm idle..just shy of 30 psi.
     
    Concorde, Dec 19, 2020
    Concorde, Dec 19, 2020
    #8
  11. Dec 20, 2020 #9
    bowhunter67

    bowhunter67 Light Load Member

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    May 28, 2016
    rush city mn
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    2007 cm 870 when I overhauled it put in a new oil pump it was 22# at idle and 32# running down the road.
     
    bowhunter67, Dec 20, 2020
    bowhunter67, Dec 20, 2020
    #9
  12. Dec 20, 2020 #10
    Vivaspin

    Vivaspin Bobtail Member

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    Oct 2, 2020
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    Appreciate it guys thank you

    more info:
    65mph 1400 rpm : 31psi
    70mph 1500 rpm : 29psi
    75mph 1600 rpm : 28psi

    shouldnt it be the opposite, the more rpms the more psi.
     
    Vivaspin, Dec 20, 2020
    Vivaspin, Dec 20, 2020
    #10
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