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Oil Pressure Test

  1. Disconnect and remove the EOP sensor. REFER to: Engine Oil Pressure (EOP) Sensor .
  2. NOTE: Use a oil pressure gauge that is capable of 150 psi (1034.34 kPa).
    NOTE: Inspect the cylinder block for threads remaining in the oil galley port when the fitting is removed.

    Connect a commercially available oil pressure gauge to the oil pressure switch oil galley port.

  3. Run the engine until normal operating temperature is reached.
  4. Run the engine at the specified rpm and record the gauge reading.
  5. The oil pressure should be within specifications, REFER to: Specifications .
  6. If the pressure is not within specification, check the following possible sources:

    • Insufficient oil

    • Oil leakage

    • Worn or damaged oil pump

    • Oil pan screen cover blockage

    • Excessive main bearing clearance

    • Excessive connecting rod bearing clearance

    • Chain tensioner leak

    • Damaged oil filter

    • Blocked tube and filter screen

    • Oil pump inlet line from tank restriction

    • Oil cooler blockage

    • Oil pump pressure relief valve stuck open or broken spring

    • Damaged anti drain back valve in the oil pan

    • Oil pump belt or pulley slippage

    • Oil to coolant or oil cooler damage

    • Oil thermostat damaged

  7. Remove the commercially available oil pressure gauge.
  8. Install and connect the EOP sensor. REFER to: Engine Oil Pressure (EOP) Sensor .
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