TM 10-3930-671-24 Table 2-2.  Unit Troubleshooting Procedures - CONT. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ENGINE (CONT.) 3. A LOSS OF POWER - CONT. Step 3. Test fuel filter pressure drop at engine idle (650-700 rpm). Disconnect fuel supply line at outlet side of fuel filter.  Test fuel pressure.  If test results are not 1.50 to 2.25 psi, replace fuel filter (Para 3-16). If test results are 1.50 to 2.25 psi, go to step 4. Step 4. Test coolant temperature after 10 minutes of operation. If coolant temperature is above 217°F (102°C), proceed to 4.  ENGINE TEMPERA- TURE ABOVE NORMAL. If coolant temperature is below 180°F (820C), remove and test thermostat (Appen- dix F, Cooling System, Section 4.8).  Refer to Appendix F, Continental Diesel Engine, Section 4.4, Section 4 to test thermostat.  Replace thermostat as necessary. If coolant temperature is normal, go to step 5. Step 5. Check that fuel type is correct type and not contaminated (W-F-800). If fuel is incorrect type or contaminated, drain fuel tank and refill with correct/clean fuel. If fuel is OK, notify DS/GS maintenance. 4. ENGINE TEMPERATURE ABOVE NORMAL. Step 1. Check radiator for damage or debris that could restrict cooling capability. WARNING Compressed air used for cleaning purposes must not exceed regulated 30 psi (207 kPa).Use only with  effective  chip  guarding  and  personal  protective  equipment  (goggles/shield,  gloves,  etc.)    to prevent injury to personnel. If radiator is full of debris, use compressed air to blow debris out of radiator. If radiator is damaged, or debris cannot be removed, replace radiator (Appendix F, Engine Removal, Section 4.11). If radiator is OK, go to step 2. 2-6