TM 5-3810-306-20
TABLE 3-1. ORGANIZATIONAL TROUBLESHOOTING (CONTD)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. EXCESSIVE ENGINE NOISES
Step 1.
Drive belt squeal, insufficient tension or abnormally high loading.
a. Check belt tensioner and inspect drive belt.
b. Make sure water pump, tensioner pulley, fan hub and alternator turn freely. If OK, do Step 2.
c. Replace drive belt and/or belt tensioner. (Refer to pages 7-22 and 7-23.)
Step 2.
Intake air or exhaust leaks.
a. Refer to troubleshooting logic for excessive exhaust smoke. If OK, do Step 3.
Step 3.
Valves incorrectly adjusted.
a. Check and adjust valves. (Refer to page 4-2.)
b. Contact Direct Support Maintenance.
Step 4.
Defective engine.
a. Contact Direct Support Maintenance.
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