TM 10-3930-671-24 Table 2-2.  Unit Troubleshooting Procedures - CONT. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ENGINE (CONT.) 4. ENGINE TEMPERATURE ABOVE NORMAL - CONT. Step 2. Check fan belt adjustment. If fan belt requires adjustment, adjust drive belt (Appendix F, Cooling System, Section 4.8). If fan belt is OK, go to step 3. Step 3. Check for faulty radiator cap (Appendix F, Cooling System, Section 4.8). If radiator cap is faulty, replace radiator cap (Appendix F, Cooling System, Section 4.8). If radiator cap is OK, go to step 4. Step 4. Check for faulty thermostat (Appendix F, Cooling System, Section 4.8).  Refer to Appendix F, Continental Diesel Engine, Section 4.4, Section 4 to test thermostat. If thermostat is faulty, replace thermostat (Appendix F, Cooling System, Section 4.8). If thermostat is OK, 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. 5. BLACK EXHAUST SMOKE. 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. 2-7