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C12 no oil pressure

Discussion in 'Trucks' started by materthegreater, Sep 26, 2022.

  1. materthegreater

    materthegreater Well-Known Member

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    Disclaimer: the search function on this site is frustrating! I tried searching for c12 oil pressure and it omitted c12 and oil because the words are too short! How are we supposed to search for things with short names?!

    Anyway, back to the question at hand. A customer has a Cat C12 in an International and it has no oil pressure according to the gauge in the dash, and the "warn engine" light comes on. (Disclaimer #2, I'm not a mechanic, just an excavator operator hoping to use this truck for moving stumps)
    I'm suspicious (read: hopeful) that it's just a wiring issue with the pressure sensor. I have no familiarity with cat engines. Where would the sensor be located? Hopefully I can trace the wiring and find the problem. If it's not a bad connection or sensor, then I guess the "warn engine" light should read "worn engine" :confused:

    PXL_20220926_204726544.jpg
     
  2. heymccall

    heymccall Senior Member

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    Nige and DB2 like this.
  3. Coaldust

    Coaldust Senior Member

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    C12 no oil pressure? Is there a rod sticking out the side of the block? Cause’ that’s what C12’s like to do.
     
  4. Coaldust

    Coaldust Senior Member

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    I remember the oil pressure sensor is on the RH side by the water pump.
     
  5. materthegreater

    materthegreater Well-Known Member

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    Thanks. I didn't notice any rods sticking out where they aren't supposed to be! It seems to idle fine. I will check for the sensor, thanks.
     
  6. 56wrench

    56wrench Senior Member

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    I’d be checking the oil pressure with a master gauge just to make sure there are no issues with the engine itself and then worry about the gauge/light
     
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  7. materthegreater

    materthegreater Well-Known Member

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    @56wrench , I agree but I probably won't get that involved. If it's not a simple electrical problem then I'll let the owner call a mechanic.

    @Coaldust , when you say RH side, is that from the mechanic's or driver's perspective? I couldn't find anything other than the coolant temp sensor on the driver's right hand side. The other side (left when sitting in the truck looking forward) has what looks like a pressure sensor on the end of a hydraulic hose.

    PXL_20220929_170904856.jpg

    PXL_20220929_170925649_exported_407_1664532853365.jpg
     
  8. 56wrench

    56wrench Senior Member

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    It looks like that sensor is leaking oil. When that happens they are usually kaput
     
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  9. Nige

    Nige Senior Member

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    Left side view of a C12 marine engine, the nearest I could find. On-highway version should have the oil pressure sensor in the same place IMO.

    upload_2022-10-1_15-36-1.png
     
  10. materthegreater

    materthegreater Well-Known Member

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    A friend came a checked it with a gauge yesterday. 40 psi at idle. Thanks for all the input
     
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