TM 10-3930-669-20 6.  ENGINE OVERHEATS (ENGINE OIL TEMPERATURE OVER 250°F [121°C]) (CONT). KNOWN INFO Engine oil level OK. Engine oil temperature is over 250°. Engine oil temperature sensor OK. Engine oil temperature gauge OK. Gauge wire 5 OK. POSSIBLE PROBLEMS Gauge ground wire faulty. Wire 19 faulty. Cylinder head fins and air outlet frame dirty. Oil cooler fins dirty. Oil cooler faulty. KNOWN INFO Engine oil level OK. Engine oil temperature is over 250°. Engine oil temperature sensor OK. Engine oil temperature gauge OK. Gauge wire 5 OK. Gauge ground wire OK. POSSIBLE PROBLEMS Wire 19 faulty. Cylinder head fins and air outlet frame dirty. Oil cooler fins dirty. Oil cooler faulty. TEST OPTIONS Continuity test. STE/ICE-R #91. REASON FOR QUESTION If continuity is not present, gauge ground wire is faulty. TEST OPTIONS Continuity test. STE/ICE-R #91. REASON FOR QUESTION If continuity is not present, sensor wire 19 is faulty. 2-86