TM 5-2420-230-24-2
roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-54
Section TS - Troubleshooting Symptoms
Engine Vibration Excessive
This is symptom tree T075.
Cause
Correction
Refer to the Engine Runs Rough or Misfires
Engine not running smoothly
.......
symptom tree.
OK
L
Check the oil level. Verify the dipstick calibra-
tion and oil pan capacity. Fill the system to the
ubricating oil level is above specification
.......
specified level. Refer to Procedure 007-025.
OK
F
Check the fan. Refer to the OEM service
an is loose, damaged, or not balanced
.......
manual.
OK
F
Inspect or replace the fan hub. Refer to
an hub malfunctioning
.......
Procedure 008-036.
OK
V
ibration damper malfunctioning (six cylinder
Inspect the vibration damper. Replace, if
.......
only)
necessary. Refer to Procedure 001-052.
OK
E
Verify the condition of the mounts. Refer to
ngine mounts are worn, damaged, loose, or
.......
Procedure 016-010. Refer to OEM service
not correct
manual.
OK
I
Check or adjust the bumper spring adjustment.
dle adjustment not correct
.......
Refer to Procedure 005-029.
OK
A
Clean and replace the alternator. Refer to
lternator bearing worn or damaged
.......
Procedure 013-001.
OK
P
Inspect the crankshaft and rods for damage
ower components loose or broken
.......
that causes an unbalance. Refer to Procedure
001-016 or 001-014.
OK
T
(Continued)
L-638