TM 10-3930-669-34 2. LOW  ENGINE  OIL  PRESSURE  (OIL  PRESSURE  GAUGE  CONTINUOUSLY  READS  LESS  THAN  30  TO  60  PSI [207 - 414 KPA] AT 625 TO 750 RPM) (CONT). KNOWN INFO TEST OPTIONS Oil level OK. Visual inspection. Oil suction tube OK. POSSIBLE PROBLEMS REASON FOR QUESTION Oil tube faulty. Oil pump faulty. If oil tube is faulty, engine oil Oil pump seal faulty. pressure will be low. Rod and main bearings faulty Rifle lines clogged. Oil pump pressure valve faulty KNOWN INFO TEST OPTIONS Oil level OK. Visual inspection. Oil suction tube OK. Oil tube OK. REASON FOR QUESTION POSSIBLE PROBLEMS If oil pump is faulty, engine oil pressure will be low. Oil pump faulty. Oil pump seal faulty. Rod and main bearings faulty. Rifle lines clogged. Oil pump pressure valve faulty. 2-26 (Para 3-12) Replace oil pump or engine (Para 3-12 or 3-3).  Goo to Step 7 of this Fault