Oil Pressure Test

1. Disconnect and remove the oil pressure sensor (9278) 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 sender screw port.
3. Run the engine until normal operating temperature is reached.
4. Run the engine at 3,000 rpm and record the gauge readings.
5. The oil pressure should be:
At 3,000 rpm, 138-310 kPa (20-45 psi).
6. If the pressure is not within specification, check the following possible sources:
a. Oil leakage.
b. Insufficient oil.
c. Clogged oil strainer.
d. Worn or damaged oil pump.
e. Excessive main bearing clearance.
f. Excessive connecting rod clearance.
g. Excessive camshaft bearing clearance