Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

PART 8: MAINTENANCE AND SERVICE
(1) The removal or rendering inoperative by any person
other than for 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 operation of the vehicle after such device or element of
design has been removed or rendered inoperative by any
person.
Among those acts presumed to constitute tampering are
• 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.
• Engine Electronic Control Unit (ECU)
Modifying ECU parameters.
• Engine Cooling System
Removing or rendering inoperative the fan clutch.
Tampering with Noise Control System Prohibited
Removing the fan shroud.
• Air Intake System
Removing or rendering inoperative the air cleaner /
silencers or intake piping.
• Exhaust System
Removing or rendering inoperative the exhaust system
components.
• Inner Fender Shields and Cab Skirts
Removing shields or skirts.
Cutting away parts of shields, skirts or damaged or
loose portions of shields or skirts.
• Fuel System
Removing or rendering engine speed governor inoperative,
allowing engine speed to exceed manufacturer’s
specifications.
Removing air signal attenuator on engines equipped
with this device.
R(08/07) Y53-6015 – 191 –