TM   10-3930-643-20 ENGINE, FUEL, EXHAUST AND COOLING TROUBLESHOOTING AND MAINTENANCE. 4-1. Engine    Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION c.   VIBRATION. Check   the   following   accessory   mounting   bolts   on   engine: Air   cleaner. Refer   to   paragraph   4-17. Air  compressor. Refer   to   paragraph   8-17. Alternator. Refer   to   paragraph   5-9. Engine   side   access   covers. Refer   to   paragraph   12-4. Fan   guard.   Refer   to   paragraph   4-28. Muffler    clamps. Refer   to   paragraph   4-26. O i l    c o o l e r. Refer   to   TM   10-3930-643-34. Turbocharger.   Refer If   mountings   are If   mountings   are d. NOISE  -   COMBUSTION. to  TM  10-3930-643-34. loose,   tighten   them. not   loose,   go   to   Fuel    System    Troubleshooting. Check   quality   of   fuel. If   fuel   is   contaminated,   drain   fuel   tank,   change   fuel   filters   and r e f i l l . Then   vent   and   prime   system. Refer   to   paragraph   4-23. I f    f u e l    i s    c l e a n,    go   to   Fuel   System   Troubleshooting. e.  NOISE  -  MECHANICAL. Inspect   engine   compartment   for   any   loose   components. If   any   components   are   loose,   tighten   them. If   noise   continues,   notify   Direct   Support. 4-3

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