Cummins ISX 485ST low oil pressure

Discussion in 'Kenworth Forum' started by Nefi, Jan 16, 2016.

  1. Sipesh

    Sipesh Medium Load Member

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    Apr 3, 2014
    Colorado
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    Yup, 40 psi is normal on the ISX when the truck is cruising.
     
    Nefi Thanks this.
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  3. Nefi

    Nefi Bobtail Member

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    Jan 16, 2016
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    Awesome thank you, I'm glad I was able to figure all this stuff with the help of this thread!
     
  4. TULY007

    TULY007 Light Load Member

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    Mar 27, 2013
    USA
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    There was a recall on my 14 isx from Cummins FOR The valve inside of the oil filter housing ,is to open the oil flow at a certain oil pressure when filter is to cloged with soot,...so it my take care of the sudden drop on oil pressure ...if recalled it is changed for free....y"ll may wanna ceck it out..
     
  5. aussiejosh

    aussiejosh Road Train Member

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    Airlie Beach QLd
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    If you've still got lots of oil in the crank case that leaves only the oil pump unless your oil is so old that its become like jelly and the filter hasn't been changed for 4 years.
     
  6. Crazylove

    Crazylove Bobtail Member

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    Jul 25, 2018
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    I got 04 isx 475 runs around 40 going down road but at idle it around 20 is that normal for oil pressure ?I just did a pm
     
  7. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    romulus,mi
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  8. Peashooter67

    Peashooter67 Bobtail Member

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    Nov 7, 2018
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    I’m going to hijack this thread. Please bare with me and forgive my rudeness.

    I have an 06 Pete with the twin cam isx.
    “My mechanic and I are stumped and trying last thing to see if this fixes the problem.” With 280 miles on fresh inframe.
    Replaced reman head with new head and new cams with new rocker shafts and rockers.
    New bypass valve, new pump, new pump pressure regulator”and shimmed for higher pressure “, new pick up tube and o-ring, new pistions and liners, new mail and rod bearings. Motor is clean as a whistle inside and oil with new oil and filter.


    Start motor and oil pressure is 45-50 psi and as the motor/oil warms up the pressure comes down. At 600 rpm and 220 temp on oil the pressure hovers at about 8psi and 20-22 psi at 1400 rpm.

    About to change oil cooler and t-stat to oil cooler.

    I’m ready to give up. Cummins is no help on this either ?

    Ideas from those that actually been here and done this. Please no keyboard mechanics.
     
  9. Peashooter67

    Peashooter67 Bobtail Member

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    Nov 7, 2018
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    This has been verified with mechanical oil pressure gauge on the main oil gally, it’s 8 psi there toooooo.

    Signed mr. Frustrated
     
  10. pushbroom

    pushbroom Road Train Member

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    What filter are you running? I have had aftermarket ones cause issues. LF9070 seems to be the best.
    Also had a tech change an oil cooler and leave a plug in the main oil galley.
    What type of oil? Pressure good before the inframe?
     
  11. magoo68

    magoo68 Road Train Member

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    Jun 11, 2011
    st malo mb canada
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    almost sounds like too much clearance on a bearing
     
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