TM 9-4940-568-20
2-69
Table 2-7. Engine Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
28. ENGINE VIBRATION EXCESSIVE.
Engine not running smoothly.
Refer to troubleshooting Malfunction 13 for Engine Runs Rough Or Misfiring.
Fan damaged or malfunctioning.
Check/replace the fan blade (Para 8-30).
Fan hub malfunctioning.
Inspect/replace the fan hub (Para 8-29).
Alternator bearing worn or damaged.
Replace the alternator (Para 8-42).
29. ENGINE NOISES EXCESSIVE.
Drive belt squeal, insufficient tension or abnormally high loading.
Check the tensioner and inspect the drive belt for deterioration. Make sure water pump,
tensioner pulley, fan hub and alternator turn freely.
Check for paint/oil or other material on pulleys.
Intake air or exhaust leaks.
Repair/replace components to stop leaks (Para 8-12 and 8-23).
30. ALTERNATOR NOT CHARGING OR INSUFFICIENT CHARGING.
Remove two wires from B+ terminal and connect them together and wrap with electrical tape. Start generator
and measure voltage output from B+ terminal.
If voltage is less than 28 VDC, replace alternator (Para 8-42).
