User Manual

gasket; replace gasket if
necessary
.
• Check cap screws for tightness,
including those at the flanges.
Refer to the engine manufacturer's
service manual for proper
tightening sequence and torque
values.
Joints and Clamps
• Check for leaks, and tighten as
necessary. Check for deterioration
or dents in pipes and clamps which
could allow exhaust to escape.
• Replace any serviceable joints,
flexible pipes and gaskets at the
service intervals.
Selective Catalysts Reduction (SCR)
• Check SCR canister filter, clamps
and mounting brackets. Tighten if
necessary. Inspect SCR canister
for signs of rust or corrosion.
Exhaust Piping
• Check exhaust piping for rust,
corrosion, or damage. Replace
deteriorated piping before holes
appear. If piping is perforated at
any point, temporary patching or
lagging is acceptable until you can
have permanent repairs made. On
turbocharged engines, check joints
at flanges and mounting brackets
for tightness.
Diesel Particulate Filter (DPF)
• Check DPF, clamps, and mounting
brackets. Tighten if necessary.
Inspect DPF for signs of rust or
corrosion.
• Check internal baffling. You can do
this by listening for rattling sounds
while tapping on the (DPF with a
rubber mallet or revving the engine
up and down through its normal
operating range.
Mufflers
• Check muffler, clamps, and
mounting brackets. Tighten if
necessary. Inspect muffler for signs
of rust or corrosion.
• Check internal baffling. You can do
this by listening for rattling sounds
while tapping the muffler with a
rubber mallet or revving the engine
up and down through its normal
operating range.
DEF Tank (See Engine Aftertreatment
System manual)
Exhaust Tail Pipe
• Check the mounting. Tighten as
necessary. The miter cut at the tip
of the pipe must be facing the rear
of the vehicle. Do not modify the
end of the pipe in any way.
Engine Fan and Shroud
WARNING
Do not work on the fan with the engine
running.
The engine fan can engage at
any time without warning. Anyone near
the fan when it turns on could be in-
jured. Before turning on the ignition, be
sure that no one is near the fan.
• Check all fasteners for tightness.
Check for stress cracks in the
shroud. Make sure the shroud is
adjusted so that it does not touch
the fan blades.
•
Check to verify that the fan is
disengaged (not turning) with the
engine running at normal operating
temperatures (from cold to the
point that the fan engages).
• Check fan blade mounting bolts.
Inspect fan blades to be sure they
are not cracked or bent.
Transmission and Driveline
• Substituting a different main
transmission or driveline
components, other than design-
MAINTENANCE - Noise and Emission Control
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