ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-24 3-12 TABLE 3-2.  UNIT TROUBLESHOOTING (Sheet 9 of 11) OK   Not OK   Not OK   OK BLACK OR GRAY EXHAUST SMOKE Black or gray exhaust smoke. Check for restricted air filter (refer to TM 9-6115-671-14 or other applicable TM). Replace air filter elements (refer to TM 9-6115-671-14 or other applicable TM). Check for defective fuel injection pump (refer to paragraph 3.12.5). Notify next higher level of maintenance. Perform end item troubleshooting procedures (refer to TM 9-6115-671-14 or other applicable TM). Not OK   OK BLUE OR WHITE EXHAUST SMOKE Blue or white exhaust smoke. Check for restricted air filter (refer to TM 9-6115-671-14 or other applicable TM). Replace air filter elements (refer to TM 9-6115-671-14 or other applicable TM). Notify next higher level of maintenance. Perform end item troubleshooting procedures (refer to TM 9-6115-671-14 or othe applicable TM). Notify next higher level of maintenance.