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. Oil tube OK. REASON FOR QUESTION Oil pump OK. Oil pump seal OK. Rod  and main bearings OK. If rifle lines are blocked, rifle lines are faulty. If rifle lines are POSSIBLE PROBLEMS not blocked, oil pump pressure valve is faulty. Rifle lines clogged. Oil pump pressure valve faulty. KNOWN INFO TEST OPTIONS Oil level OK. Verify repair. Oil suction tube OK. Oil tube OK. REASON FOR QUESTION Oil pump OK. Oil pump seal OK. Rod and main bearings OK. If oil pressure gauge reads 30 Rifle lines OK. to 60 psi (207 - 414 kPa), fault Oil pump pressure valve OK. has been corrected. POSSIBLE PROBLEMS 2-30 Clean oil rifle lines (Para 3-4).  Go to Step 7 of this Fault. Replace oil pump (Para 3-12).  Go to Step 7 of this Fault.