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Oil Pressure Diagnosis and Testing (6.2L LS9)

Special Tools

    Fig 1: View Of Testing Oil Pressure
    GM2054004Courtesy of GENERAL MOTORS COMPANY
  1. With the vehicle on a level surface, run the vehicle for a few minutes. Allow adequate drain down time, 2-3 minutes, and measure the oil level.
  2. If required, add the recommended grade engine oil and fill the oil tank until the oil level measures full on the oil level indicator.
  3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gauge or lamp.
  4. Listen for a noisy valve train or a knocking noise.
  5. Inspect for the following conditions:
    • Oil diluted by water or glycol antifreeze
    • Foamy oil
  6. Remove the oil filter and install the EN-47971  Adapter (1).
  7. Install the J 21867  Gauge (2), or equivalent to the EN-47971  Adapter (1).
  8. Run the engine and measure the engine oil pressure.
  9. Compare the readings to Engine Mechanical Specifications (6.2L LS9) .
  10. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
    • Piston oil nozzle with a check valve stuck in the open position - indicated by low oil pressure only at idle but not at high speed
    • Restricted engine oil tank screen
    • Collapsed or restricted oil hoses
    • Loose oil hose connections at the oil tank or oil pan
    • Damaged oil tank-to-hose or oil pan-to-hose O-ring seals
    • Restriction within the engine oil cooler
    • Oil pump worn or dirty

      Refer to Oil Pump Cleaning and Inspection (6.2L LS9) .

    • Oil pump-to-engine block bolts loose or oil pump mis-aligned to the oil pan rail

      Refer to Oil Pump and Crankshaft Oil Deflector Installation (LS3 with Z52 Option, LS7, LS9) .

    • Damaged oil pan gasket at oil pump sealing surface damaged
    • Malfunctioning oil pump pressure relief valve
    • Excessive bearing clearance
    • Cracked, porous, or restricted oil galleries
    • Oil gallery plugs missing or incorrectly installed

      Refer to Engine Block Plug Installation .

    • Broken valve lifters

      Repair, as necessary.

  11. If the oil pressure reading on the J 21867  Gauge, or equivalent, is within specifications, inspect for the following conditions:
    • Plugged or incorrect oil filter
    • Malfunctioning vehicle oil pressure gauge or engine oil pressure sensor

      Repair, as necessary.

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