TM 10-3930-669-34 2-11.  ENGINE SYSTEM TROUBLESHOOTING (CONT). 5.  ENGINE OVERHEATS (ENGINE TEMP GAUGE READS OVER 250°F [121°C]). INITIAL SETUP Tools and Special Tools Materials/Parts Tool Kit, General Mechanic’s: Automotive Tags, Identification (Item 21, Appendix B) (Item 1, Appendix E) Pressure Test Kit (Item 5, Appendix E) References Gauge, Tester, Injection Pump TM 10-3930-669-10 (Item 5, Appendix E) TM 10-3930-669-20 Retainer (Item 13, Appendix E) STE/ICE-R (Optional) (Item 14, Appendix E) Equipment Condition Personnel Required Engine OFF (TM 10-3930-669-10) Two MAIN POWER switch OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) KNOWN INFO Engine oil level OK. POSSIBLE PROBLEMS Injection pump faulty. Injection pump timing incorrect. TEST OPTIONS Injection pump pressure test. REASON FOR QUESTION If injection pump is faulty, engine will overheat. Replace injection(Para 4-5). Go to Step 3 of this Fault WARNING Read WARNING on Page 2-49 2-48