ARMY TM 9-2815-257-24 AIR FORCE TO 38G1-128-2 MARINE CORPS TM 10155A/2815-24/3 4-6 Table 4-2.  Direct Support Level Troubleshooting (continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 5. ENGINE RUNS ROUGH a.    Check governor control for proper position of regulator spring (Para. 4-7). Adjust governor lever (Para. 4-7). b. Check for proper thickness of fuel injection pump shim (Para. 4-11). Adjust shim thickness / injection timing (Para. 4-11). c. Damaged or defective fuel injection pump. Remove and replace fuel injection pump (Para. 4-11). d.    Refer trouble to general support maintenance level. 6. ENGINE EMITS WHITE SMOKE a. Check injection timing (too slow) (Para. 4-11). Adjust fuel injection pump timing by removing shims (Para. 4-11). b. Refer trouble to general support maintenance level. 7. ENGINE EMITS BLACK SMOKE a. Check injection timing (too slow) (Para. 4-11). Adjust fuel injection pump timing by removing shims (Para. 4-11). b.    Refer trouble to general support maintenance level.