operators_manual

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. Around the
fan shroud, the recommended distance 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 not correct.
• The leading edge of any fan blade
must be 1 in. (25 mm) from the
inside edge of the shroud.
Air Intake System
General information and precautions on
how to maintain the 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 connections
as a step or to pull yourself up. This could
loosen the connections and open the sys-
tem to unfiltered air which could damage the
engine.
See Also
Pipe and Hose Clamp Torque Values on
page 221
Turbocharger
General information about maintaining the
turbocharger.
WARNING!
Do not operate engine with turbocharger in-
take piping disconnected. A suction is creat-
ed when the engine is running. This suction
could draw your hand or anything else near
it into the impeller fan. You could be injured.
Always 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
this immediately. If you detect any
deficiencies, take the vehicle to an
authorized dealer for servicing. Delay could
MAINTENANCE - Engine Maintenance
190 Y53-6096-1A1 (01/17)
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