TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-61
Excessive Noise
This is symptom tree T081-001.
Cause
Correction
Check the drive belt tension. Adjust the
tension if necessary. Refer to Procedure
Drive belt is loose or has high loading
.......
008-003 . Check the accessory drive belts.
Refer to the OEM service manual.
OK
I
Refer to the Exhaust Black Smoke - Excessive
ntake air or exhaust leaks
.......
symptom tree.
OK
T
Turbocharger fluttering noises can be heard
urbocharger noise
.......
during deceleration or quick throttle closing.
This noise is normal.
OK
V
Adjust valves. Make sure the pushrods are not
alve lash excessive
.......
bent or rocker levers not severely worn. Refer
to Procedure 003-004.
OK
P
Inspect rod bearings. Replace if necessary.
ower knock
.......
Refer to Procedure 001-014.
L-645
