conditions (e.g. fan belt misaligned
or excessive wear/damage, etc.).
• With the engine idling and the hood
open, stand at the front of the
vehicle. Listen for any noises
coming from the fan hub. Bearings
that have lost lubricant and are dry
will typically emit a squeal or a
growl when the engine is at
operating temperature and the fan
clutch is engaged. If noise is
detected, have the fan bearings
inspected by an authorized
dealership.
Engine Fan Blade
Verify that there is enough fan blade
clearance with the fan shroud. The
recommended distance around the fan
shroud is 1 in. (25 mm) from front edge of
any fan blade-to-radiator side member.
Minimum clearance is 3/4 in. (19 mm).
• Rear edge of any blade must be no
closer than 3/8 in. (9 mm) to the
nearest engine component. If this
cannot be obtained, the fan spacer
or fan is incorrectly placed.
• The leading edge of any fan blade
must be 1 in. (25 mm) from the
inside edge of the shroud.
Air Intake System
Engine heat, vibration, and age combine to
loosen air intake connections and cause
cracks in the tubing and elbows. Leaks in
the intake system allow abrasive dust to
enter the engine and quickly cause
expensive damage. During your daily walk-
around inspection, carefully check all
tubing, elbows, clamps, supports, and
fasteners for condition and tightness.
Check the charge-air-cooler for air leaks
annually. The air leaks can be caused by
cracked tubes or header. For service see
your authorized dealer.
CAUTION
DO NOT use air intake pipes and con-
nections as a step or to pull yourself
up. This could loosen the connections
and open the system to unfiltered air
which could damage the engine.
Turbocharger
WARNING
DO NOT operate engine with turbo-
charger intake piping disconnected. A
suction is created when the engine is
running. This suction could draw your
hand or anything else near it into the
impeller fan. You could be injured. Al-
ways keep the intake piping connected
when you will be running the engine.
When servicing the air intake and exhaust
systems on a turbocharged engine, check
the items listed below:
Lubricating System
Check the oil lines, housing, and
connections. Look for leaks, damage, or
deterioration. Leaks could mean you have
damaged oil lines or oil seals.
Manifold
With the engine operating, check for
leaking manifold or flange gaskets.
High Frequency Vibration
Vibration may indicate turbo rotor
imbalance. Have your dealer investigate
MAINTENANCE - Engine Maintenance
246 Y53-6076-1D1 (09/20)
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