Remove the oil pressure sensor.
Install a pressure gauge [Figure 70-100-51].
Start the engine and run until it is at operating temperature.
If the oil pressure is less than the allowable limit, check the following items:
* Engine Oil Level Low
* Oil Pump Defective
* Oil Galley Plugged
* Oil Strainer Plugged
* Excessive Clearance at the Rod & Main Bearings
* Relief Valve Stuck
