•
5.9L
(DIESEL)
ENGINES
9 - 5
SERVICE
DIAGNOSIS
• MECHANICAL
(CONT.)
CONDITION
POSSIBLE
CAUSES
CORRECTION
EXCESSIVE
VIBRATION
Loose
or broken engine mounts.
Replace
engine mounts.
Damaged
fan
or
improperly
operating
accessories.
Check
and replace the
vibrating
components.
Improperly operating
vibration
damper.
Inspect/replace the
vibration
damper.
Improperly operating fan hub.
Inspect/replace the fan hub.
Worn
or damaged alternator
bearing.
Check/replace
the
alternator.
Flywheel housing misaligned.
Check/correct
flywheel alignment.
Loose
or broken power
component.
Inspect the crankshaft and rods for damage
that
causes
an
unbalance. Repair/replace as required.
Worn
or unbalanced driveline
components.
Check/repair
driveline components.
EXCESSIVE
ENGINE
NOISES
Drive
belt
squeal, insufficient
tension or abnormally high
loading.
Check
the tensioner and inspect the drive
belt.
Make
sure water
pump, tensioner pulley, fan hub and alternator
turn
freely.
Intake
air or exhaust leaks. Refer to
Excessive
Exhaust Smoke (Engine Diagnosis—
Performance).
Excessive
valve lash
Adjust valves.
Make
sure the push rods are not
bent
and rocker
levers
or adjusting
screws
are not severely worn. Replace
bent
or severely
worn
pads.
Turbocharger noise.
Check
turbocharger impeller and
turbine
wheel for housing
contact. Repair/replace as required.
Gear
train
noise.
Visually inspect and measure gear backlash. Replace gears as
required.
Power function knock.
Check/replace
rod and main bearings.
ALTERNATOR
NOT
CHARGING OR IN-
SUFFICIENT
CHARGING
Loose
or corroded
battery
connections.
Alternator
belt
slipping.
Clean/tighten
battery
connection.
Check/replace
belt
tensioner. Check/replace
belt.
Alternator pulley loose on
shaft.
Tighten pulley.
Improperly
operating
alternator.
Check/replace
alternator.
J9109-253
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