The air filter element should be
replaced when the colored band on
the gauge reaches the CHANGE
FILTER mark. Engine performance
and fuel economy are adversely
affected when maximum restriction
is reached. After servicing the air
filter element, reset the restriction
gauge by pressing the button on the
end of the gauge.
Air filter restriction gauge, F-250/350/450/550 & Excursion
The restriction gauge, located on
the upper housing of the air cleaner
assembly, monitors the condition of
the air filter element in two ways:
First, the colored indictor inside the
gauge highlights the percentage that
the air filter element is clogged with
dust or contaminants. Refer to
Engine Compartment
in
Service
Points
chapter.
Second, the gauge contains an electrical switch which illuminates a
warning light on the instrument cluster when the air filter element is
100% clogged. Refer to
F-250/350/450/550, Excursion
in
Warning
Lights
chapter.
Check the air filter restriction gauge whenever the hood is raised to
perform general engine maintenance. If the vehicle is operated in
extremely dusty conditions, check the gauge at least every 800 km (500
miles), or two weeks, whichever comes first.
The air filter element must be
replaced when the colored band on
the gauge reaches the CHANGE
FILTER mark. Engine performance
and fuel economy are adversely
affected when the maximum
restriction is reached.
AIR FILTER GAUGE
CHANG
E FILTER
CHANGE FILTER
Diesel information
6
