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General Information 17
Tampering with Noise Control System
Federal law prohibits the following acts or the causing thereof:
(1) The removal or rendering inoperative by any person, other than for
purposes of maintenance, repair, or replacement, of any device or element of
design incorporated into any new vehicle for the purpose of noise control prior
to its sale or delivery to the ultimate purchaser or while it is in use;
or
(2) the use of the vehicle after such device or element of design has been
removed or rendered inoperative by any person.
Among the acts that constitute tampering are the acts listed below:
ț Removal, or rendering inoperative, of any exhaust components, including
mufflers, heavy or double-wall exhaust tubing, flexible tubing or exhaust
pipe clamping.
ț Removal, or rendering inoperative, of the temperature-modulated cooling
fan system.
ț Removal of the cooling fan shroud.
ț Removal, or rendering inoperative, of the air cleaner or air intake in-line
silencer.
ț Removal of the sound deadening material from the hood or cab tunnel.
ț Removal, or rendering inoperative, of the engine speed governor so as to
allow engine speed to exceed the manufacturer's specifications.
ț Removal of splash shields located inside the wheel housings.
ț Removal of engine block shields.
ț Removal of engine crankcase shields or insulation.
ț Removal of insulated rocker arm covers.
ț Removal of transmission noise shields.
Noise Shielding and Insulation Devices
Maintenance
Ensure sound shielding and insulating devices are intact. Inspect components
for damage. Primary system components requiring noise related inspection
include the hood, engine compartment insulating materials (including hood
insulation, bulkhead insulation, doghouse insulation, etc.) splash shields, cab
skirts, fender shields, and body panels. Inspect all related fasteners, brackets,
and clamps for damage and tightness.
USA22978.bk.book Page 17 Wednesday, July 9, 2008 9:09 AM