TM 10-3930-669-20 2-13.  ENGINE SYSTEM TROUBLESHOOTING (CONT). 6.  ENGINE OVERHEATS (ENGINE OIL TEMPERATURE OVER 250°F [121"C]). INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) STE/ICE-R (Optional) (Item 14, Appendix B) References TM 10-3930-669-10 Equipment Condition Engine OFF (TM 10-3930-669-10) 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 TEST OPTIONS Engine oil level OK. Engine oil temperature is over 250' Continuity test. POSSIBLE PROBLEMS REASON FOR QUESTION Engine oil temperature sensor faulty. Engine oil temperature gauge faulty. Gauge wire 5 faulty. Gauge ground wire faulty. Wire 19 faulty. Cylinder head fins and air outlet frame dirty. Oil cooler fins dirty. Oil cooler faulty. When engine is at room temperature, resistance measurement  of  oil  temperature sensor should be 400-550 ohms. ¬ 2-82