oil pressure

Discussion in '1973-1987' started by 76454, May 23, 2002.

  1. 76454

    76454 Member

    May 3, 2002
    I just tossed a new carb(edelbrock #1411), camshaft(edelbrock #2162), intake manifold(edelbrock #2161) on my truck. I also had the valves done, so now it runs awesome, but there's a problem. Before the "surgery", my oil pressure gauge would read 30-45 psi at idle, and 45-60 psi on the freeway, depending upon how much oil was in the pan at the time. Now, it reads 5psi at idle, and it will barely break 30psi on the freeway. There is plenty of oil in the pan, and I don't have an oil cooler. The dipstick reads full everytime I check it. Could the sending unit be malfunctioning, or should I pull the pan and check the pump pickup?
  2. GreatNorthWoods

    GreatNorthWoods Member

    Apr 3, 2002
    Littleton USA
    If you didn't do anything to the bottom end, the oil pressure should be the same as it was before. I'd suspect the sending unit at this point. Is it mechanical or electric? If electric, try replacing the sender and gauge with a mechanical unit and see what readings you get. If mechanical, try another sending unit. Don't use pipe sealer or tape on any electrical sending unit...
  3. wondra77

    wondra77 Member

    Jun 24, 2002
    sometimes when doing a valve job on an older engine the new compression can create new/more pressure on the bearings causing them to ware extreamly fast considering that they may have been worn or slighty lose pryor to the valve job, oil pressure is created by the bearings, when bearings are at the correct tolerance then good pressure and the looser they get the lower the pressure
  4. Twisters 4x4

    Twisters 4x4 Member

    Apr 28, 2008
    Longview TX
    And that would be why the long time rule of thumb has been
    "You can do the bottom without doing the top but not the top without doing the bottom."
    If it's worn much it will start knocking the bottom out of it.

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