8 Operator’s Manual Vehicle Maintenance CXU, CHU, GU, TD, MRU and LEU Removal, or rendering inoperative, of the temperature-modulated cooling fan system. Removal of the cooling fan shroud. Removal, or rendering inoperative, of the air cleaner or air intake in-line silencer. Removal of the sound deadening material from the hood or cab tunnel. Removal, or rendering inoperative, of the engine speed governor so as to allow engine speed to exceed the manufacturers specifications. Removal of splash shields located inside the wheel housings. Removal of engine block shields. Removal of engine crankcase shields or insulation. Removal of insulated rocker arm covers.
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. Regulatory Compliance Acts that constitute tampering with the Noise Shielding and Insulation Devices:
Removing or rendering inoperative the engine and/or transmission noise deadening panels, shields or insulating materials. Removing or rendering inoperative the cab-tunnel or hood noise insulating materials. Removing or rendering inoperative any vehicle body mounted sound insulation components and/or shields (cab or fender shields, skirts, wheel housing splash shields, etc.).