Peterbilt 387 Manual page 198

NOISE CONTROL SYSTEM
• 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 inop-
erative, allowing engine speed to exceed manufac-
turer's specifications.
• Removing air signal attenuator on engines equipped
with this device.
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PART 8: MAINTENANCE AND SERVICE
Noise Insulating Blankets
• Removing noise insulators from engine block or from
around the oil pan.
• Cutting holes in, or cutting away part of, noise insula-
tors.
• Removing hood-mounted noise insulation.
Engine Electronic Control Unit (ECU)
Modifying ECU parameters.
Y53-6007 (R10/06)