07 9400, Cummins ISX engine 8520 CPL Oil Pressure Issue

Discussion in 'International Forum' started by lciambotti1, Jan 6, 2021.

  1. lciambotti1

    lciambotti1 Light Load Member

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    Mar 6, 2015
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    I am having an issue with the oil pressure acting erratically. My driver called and said the pressure had dropped to 20 pounds running. He was close to a shop and it was time for a service, so I had it serviced. it seemed ok, but when he got back I noticed it bouncing around. 40 PSI cold and when I revved it up, the pressure sent to 55. warm it is usually running 35 psi give or take, but I saw it going down to 20 running. idling at 20 and sometimes down to 15. I have receipts for the truck getting a bottom end done, including a new oil pump. Anyway, I replaced the oil pressure sensor and oil filter bypass valve with the new style. No change. My cummins buddy is going to hook up a gauge manually and see what we get. He also said, in rare occasions the spring in the oil pump breaks. Then he threw possible cam bushings, which I didn't want to hear. Also hooking up the computer to see what the ecm is seeing for oil pressure. Anyone have similar issues?
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Jun 14, 2009
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    You are on the right track with all of your guesses so far. Just have to wait and see what the manual pressure gauge reads.
     
    Heavyd Thanks this.
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