Engine Oil Pressure: Testing and Inspection

Oil Pressure Test

NOTE: If the low oil pressure warning indicator stays on with the engine running, check the engine oil level. If the oil level is correct, do the following test:

1. With the engine stopped, remove the oil pressure switch, and install an oil pressure gauge (A).





2. Start the engine. Shut it off immediately if the gauge registers no oil pressure. Repair the problem before continuing.
3. Allow the engine to reach operating temperature (fan comes on at least twice). The pressure should be:

Engine Oil Temperature: 176°F (80°C)
Engine Oil Pressure:
At Idle: 70 kPa (0.7 kgf/cm2, 10 psi) min.
At 3,000 rpm: 300 kPa (3.1 kgf/cm2, 44 psi) min.

4. If the oil pressure is out of specifications, inspect these items:

^ Replace the oil filter.
^ Inspect the oil pressure relief valve.
^ Check the oil screen for clogging.
^ Inspect the oil pump.