TM 9-4940-568-20
2-62
Table 2-7. Engine Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
15. ENGINE POWER OUTPUT LOW (CONT).
Intake air inadequate.
Inspect/replace air cleaner element (Para 8-12). Look for other restrictions (TM
9-4940-568-10).
Exhaust restriction.
Check/correct exhaust system for restriction (TM 9-4940-568-10).
Valve clearances incorrect.
Check/adjust valves (Para 8-3).
16. EXHAUST BLACK SMOKE EXCESSIVE.
Intake air restricted.
Inspect/replace air cleaner. Look for other restrictions (Para 8-12).
Exhaust restriction.
Check/correct exhaust system restriction (TM 9-4940-568-10).
Exhaust leak at the air intake manifold.
Check/correct leaks in the air intake manifold gasket. Look for a cracked air intake
manifold (Para 8-10).
17. EXHAUST WHITE SMOKE EXCESSIVE.
Coolant temperature too low.
Refer to Troubleshooting Step 20 for “Coolant Temperature Below Normal”.
Lubricating oil level high.
Drain oil to correct level (Para 8-2).
