TM 5-2420-230-24-2
roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-34
Section TS - Troubleshooting Symptoms
Engine Noise Excessive
This is symptom tree T047.
Cause
Correction
Check the belt tension and tighten if neces-
Fan drive belt is loose
.......
sary. Refer to Procedure 008-087.
OK
F
Check the fan. Refer to the OEM service
an is loose, damaged, or not balanced
.......
manual.
OK
A
Inspect the air intake and exhaust systems for
ir intake or exhaust leaks
.......
air leaks. Refer to Procedure 010-024.
OK
A
Inspect the air piping, chassis, and cab for
ir intake or exhaust piping is contacting the
contact points. Refer to the OEM service
.......
chassis or cab
manual.
OK
L
ubricating oil level is above or below specifi-
Check the oil level. Add or drain oil, if neces-
.......
cation
sary. Refer to Procedure 007-025.
OK
L
Refer to the Operation and Mainteance
Manual, B Series Engines, Bulletin No.
ubricating oil is thin or diluted
.......
3810205 for oil specifications. If the oil pres-
sure is low, refer to the Lubricating Oil Pres-
sure Low symptom tree .
OK
L
Check the oil pressure. Refer to Procedure
ubricating oil pressure is below specification
.......
007-052. If the pressure is low, refer to the
Lubricating Oil Pressure Low symptom tree.
OK
V
Inspect the vibration damper. Refer to Proce-
ibration damper is damaged
.......
dure 001-052.
OK
T
(Continued)
L-618
