operators_manual

CAUTION
Air leaks cause excessive noise and
may
result in serious damage to the
engine. If you do not repair them the
engine damage will not be covered by
your warranty. Repair all air leaks as
soon as you find them.
Engine Mounted Noise Insulators
•
Check condition. Is the insulator
secure? How you do this will
depend on the method of attaching
the noise insulators on the engine
and around the oil pan (bolts, snap
fasteners, or straps). Tighten loose
fasteners and repair or replace any
worn or damaged fasteners.
• Check insulators around fasteners
and stress points, especially where
they may be affected by engine
vibration. Repair any cracked or
damaged mounting points. Use
suitable reinforcing plates to
ensure that the insulators will
remain in position.
Exhaust System
• Check for exhaust leaks, which
would indicate a leaking manifold
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.
DEF Tank (See Aftertreatment System
manual)
Exhaust Tail Pipe
Engine Fan and Shroud
Hood Insulation Blanket
Inner Fenders Shields and Cab Skirts
Noise Control System -
Maintenance Log
To ensure your vehicle's noise control
requirements are maintained, record
maintenance checks. Use the following log
sheet and retain copies of documents
regarding maintenance services performed
and parts replaced on the vehicle.
MAINTENANCE - Noise and Emission Control
282 Y53-6110-1A1 (01/21)
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