User Manual

Air Intake
System
Removing or rendering inoperative
the air filter housing/silencers or
intake piping
Engine
Cooling
System
Removing or rendering the fan
clutch inoperative
Removing the fan shroud
Engine Removing or rendering engine speed
governor inoperative so as to allow engine
speed to exceed manufacturer's
specifications
Modifying ECU parameters
Exhaust
System
Removing or rendering inoperative
exhaust system components
Fuel
System
Removing or rendering engine speed
governor inoperative, allowing engine
speed to exceed manufacturer's
specifications
Removing of air signal attenuator on
engines equipped with this device
Removing of diesel exhaust fluid tank and
system
Inner Fender
Shields and
Cab Skirts
Removing shield or skirts
Cutting away parts of shields, skirts
or damaged or loose portions of
shields or skirts
Noise
Insulating
Blankets
Removing noise insulators from
engine block or from around the oil
pan
Cutting holes in, or cutting away part
of noise insulators
Removing hood-mounted noise
insulation
Inspecting Noise and Emission
Components
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 281
.
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
MAINTENANCE - Noise and Emission Control
258 Y53-6113-1A1 (11/20)
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