The following information relates to compliance with federal noise emission
standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 10,000 lbs
(4 536 kg). The Maintenance Schedule provides information on maintaining
the noise control system to minimize degradation of the noise emission control system
during the life of your vehicle. The noise control system warranty is given in your
warranty booklet.
These standards apply only to vehicles sold in the United States.
Federal law prohibits the following acts or the causing thereof:
- 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
- The use 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 the acts listed below.
Insulation:
| • | Removal of the noise shields or any underhood insulation. |
Engine:
| • | Removal or rendering engine speed governor, if the vehicle has one, inoperative
so as to allow engine speed to exceed manufacturer specifications. |
Fan and Drive:
| • | Removal of fan clutch, if the vehicle has one, or rendering clutch inoperative. |
| • | Removal of the fan shroud, if the vehicle has one. |
Air Intake:
| • | Removal of the air cleaner silencer. |
| • | Modification of the air cleaner. |
Exhaust:
| • | Removal of the muffler or resonator. |
| • | Removal of the exhaust pipes and exhaust pipe clamps. |
| • | Removal of the DOC converter, the Diesel Particulate Filter, or the diesel
exhaust gas cooler device. |
