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6.2 Diesel low oil pressure

Discussion in 'The Garage' started by mountainexplorer, Apr 24, 2006.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    When a 6.2 Diesel suddenly drops oil pressure readings to the 7-15lb range (when before it ran between 30 warm to 75 at initial start up) what could it most likely be?

    Gauge/sending unit?

    Oil Pump or component?

    Crank or motor internals going bad?
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Mine had a bad guage in the panel. Was reading 5 psi at idle and maybe 7 psi at cruise rpm. Swapped out the guage and it reads 65 psi cold and 45 ish warm at cruise rpm.

    Rene
     
  3. mountainexplorer

    mountainexplorer 1/2 ton status

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    Thats kinda how mine is. It's like it still reads but just not very high. I'm hoping it's just a gauge. With all the knocking a 6.2 makes anyway, it's hard to tell if anything's making noise from the bottom end.

    I've run it this way for a while, and I figure if it truly was that low something bad would have happened by now.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Try transplanting an OP guage and see if things change...lord knows you must have a few dozen to choose from. :D

    Rene
     
  5. mountainexplorer

    mountainexplorer 1/2 ton status

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    I guess theres no difference in oil pressure gauges from diesels to gas motors. But I wonder if the sending units are different or if the sending unit could be whats acting up.
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well...the diesel OP guages are sposed to be 0-80 psi instead of 0-60 psi. Find one and chuck it in...if the gauge shows the needle in the middle that'd tell you it was a gauge problem and that the oil pressure is ~40 psi. I used this method to confirm i had a guage problem...then went out and bought aftermarket guages I can actually trust. One day i might actually put them in the truck. :p:

    Rene
     

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