THEORY OF OPERATION Continued
AIR INDUCTION AND EXHAUST SYSTEMS
Air for M548A1 engine combustion is drawn and filtered through an air cleaner container mounted on the transverse beam.
Air enters the air cleaner through an opening in the head and filters through the air cleaner filter element. It then flows into the
engine blower through an engine air intake horn between the engine air intake and air cleaner. The restriction indicator hose
connects to the air cleaner indicator in the cab area. When the air cleaner element gets too dirty or dusty, the restriction of air
causes the air cleaner indicator to register the change. Air is discharged at the opposite side of the engine blower, creating air
pressure in the air box under the engine blower. Pressurized air blows through ports in the engine cylinders. Exhaust gases are
removed and fresh air for combustion is supplied.