Engine Lubrication: Testing and Inspection

OIL PRESSURE TEST

SPECIAL SERVICE TOOL REQUIRED
Engine Oil Pressure Gauge T73L6600-A

1. Disconnect and remove the oil pressure switch from the engine.




2. Connect an Engine Oil Pressure Gauge T73L-6600-A and Transmission Test Adapter D87C-77000-A, or equivalent, to the oil pressure switch screw port.
3. Run the engine until normal operating temperature is reached.
4. Run the engine at 3,000 rpm and record the gauge reading.
5. The oil pressure should be:
^ 392-490 kPa (57-71 psi) at 3,000 rpm.
6. If the pressure is not within specification, check the following possible sources:
a. Insufficient oil.
b. Oil leakage.
c. Worn or damaged oil pump.
d. Clogged oil strainer.
e. Excessive main bearing clearance.
f. Excessive connecting rod clearance.