TM 10-3930-669-34 2-11. ENGINE SYSTEM TROUBLESHOOTING (CONT). 2. LOW  ENGINE  OIL  PRESSURE  (OIL  PRESSURE  GAUGE  CONTINUOUSLY  READS  LESS  THAN  30  TO  60  PSI [207 - 414 KPA] AT 625 TO 750 RPM). INITIAL SETUP: Tools and Special Tools References Tool Kit, General Mechanic’s: Automotive TM 10-3930-669-10 (Item 1, Appendix E) Equipment Condition Engine removed (Para 3-3) KNOWN INFO TEST OPTIONS Oil level OK. Visual inspection. POSSIBLE PROBLEMS REASON FOR QUESTION Oil suction tube faulty. If suction tube is faulty, engine Oil tube faulty. 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. WARNING Read WARNING on Page 2-25 (Para 3-12) 2-24