SECTION III. Engine Air Intake System
The M113 air intake system consists of the air filter and housing, duct tubing, and a
roots type blower assembly. The air cleaners has a removable filter element and draws
air from the engine compartment. The air is ducted through a spring reinforced fiber
tube to the blower air horn. The roots blower pressurizes the air and feeds it to the
engine air box.
Restrictions or air leaks will affect the engine operation or durability. Dirt ingestion
will cause rapid wear to the engine internal components.
The M113 vehicle air intake system comprises aluminum castings, flexible hose, and
aluminum canisters for the air cleaner.
Figure 3-1. Air Intake
Dirt ingestion into engine caused by damaged air cleaner cannister or hoses. Internal
location of air cleaner makes it less likely to incur battle damage. Engine will operate
properly without the intake hose and cleaner, if necessary, but air should be drawn from
crew compartment to keep as much dirt as possible out of the engine. Unfiltered air
will cause dirt ingestion damage.
q Possible degraded performance