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Among those acts presumed to constitute tampering are the following
acts listed:
Vehicle System
Acts
Acoustical
Removal of noise shields, hood blanket, tunnel liner
Shielding
or acoustical absorptive material.
Engine
Removal or rendering inoperative the engine speed
governor so as to allow engine speed to exceed
manufacturer specifications. Removal of engine
mounted noise shield or oil pan enclosure.
Engine Air
Removal of the air duct, silencer, air cleaner, and/or
Induction System
air cleaner element and baffle in air cleaner;
re-indexing of air cleaner.
Exhaust System
Removal or rendering inoperative exhaust system
components including the catalytic converter -
muffler assembly, inlet pipe, outlet pipe, resonator
and flexpipe. Rotation of horizontal exhaust system
directional outlet pipe to cause the exhaust to be
emitted in a direction other than the orientation the
vehicle was originally produced with.
Engine Cooling
Removal or rendering inoperative the fan clutch.
System
Removal or modification of the fan shroud.
Replacing a fixed fan with a fan of increased
diameter, different number of blades or different
pitch width.
DEF (Diesel
Removal or rendering inoperative DEF system
exhaust fluid)
components including the DEF tank, dosing module,
System
dosing supply module, dosing control unit, NOx
electronic module or NOx sensor.
Emissions control system(s) laws
Federal law prohibits vehicle manufacturers, dealers and other persons
engaged in the business of repairing, servicing, selling, leasing or trading
motor vehicles, as well as fleet operators from knowingly removing or
rendering an emissions control device or system inoperative. Further,
modifications of the emissions control system(s) could create liability on
the part of individual owners under the laws of some states. In Canada,
modification of the emissions control system could create liability under
applicable Federal or Provincial laws.
2011 F-650/750 (f67)
Supplement, 2nd Printing
USA (fus)
Scheduled Maintenance Guide
261
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