Quantcast EXCESSIVE  BLACK  SMOKE  UNDER  LOAD

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TM    5-2815-241-34&P TROUBLESHOOTING  ON  ENGINE  TEST  STAND  –  CONTINUED MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION 10. ENGINE  MISSES  UNDER  LOAD  –  CONTINUED. Step  6. Check engine for excessive blowby and wetness in exhaust caused by broken or damaged  rings. Isolate damaged cylinder and replace broken or damaged rings. Step 7. Perform engine compression test. Check for cylinder head gasket leakage. Replace   leaking   head   gasket. Step  8. Check intake and exhaust gaskets for leakage. Replace  leaking  gaskets. 11. ENGINE SURGES AT GOVERNED RPM. Step 1. Check  filter,  gaskets,  connections,  and  suction  lines  for  air  leaks. Replace  defective  filter,  leaking  gaskets,  connections,  and  suction lines. Step  2. Perform engine compression test. Check for cylinder head gasket leakage. Replace   leaking   gasket. 12. EXCESSIVE BLACK SMOKE AT IDLE. Step  1. Remove  injectors  (page  2-34).  Check  for  correct  injector  cup  size (page  2-289). Replace  incorrect  injector  cups. Step  2. Check  for  cracked  injector  cups  (page  2-289). Replace  damaged  injector  cups. Step  3. Check  injector  timing  (page  2-106). Reset  injector  timing. Step  4. Check engine for excessive blowby and wetness in exhaust caused by broken or damaged  rings. Isolate damaged cylinders and replace broken or damaged rings. 13. EXCESSIVE  BLACK  SMOKE  UNDER  LOAD. Step  1. Check for excessive exhaust back pressure. Repair or replace defective turbocharger. Step  2. Check all fuel lines for bends, breaks, or damage causing restriction. Repair or replace restricted fuel lines. Step  3. Remove  injectors  (page  2-34).  Check  for  correct  injector  cup  size (page  2-289). Replace  incorrect  injector  cups. Step  4. Check  for  cracked  injector  cups  (page  2-289). Replace  damaged  injector  cups. 2-429


 


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