Inspecting Noise and Emission
Components
If, during periodic inspection and
maintenance of other systems and
components, it is found that parts of the
noise control system require attention, we
recommend that those parts be inspected
at more frequent intervals to assure
adequate maintenance and performance.
The following instructions are based on
inspection of the noise control system at
regular intervals as indicated in the Noise
Control System - Maintenance Log on
page 283.
Air Intake System
• Do all checks and maintenance
procedures listed in this manual
under engine air intake system and
air filter housing.
• Check the induction tubing, elbow
connections, clamps, brackets, and
fasteners for deterioration, cracks,
and security.
• If you find an air leak anywhere
between the air filter housing and
the engine, repair that leak
immediately.
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
MAINTENANCE - Noise and Emission Control
258 Y53-6076-1D1 (09/20)
5
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