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E226430
5
6
5. Remove the air filter element from the
air filter housing.
6. Remove the foam filter from the air
filter housing.
7. Install in the reverse order.
Air Filter Restriction Gauge
E226428
The air filter restriction gauge is in the
upper housing of the air filter assembly.
Check the air filter restriction gauge
whenever you open the hood to carry out
general engine maintenance or at least
every 7,500 mi (12,000 km). If you operate
your vehicle in extremely dusty conditions,
check the gauge at least every 500 mi
(800 km) or two weeks, whichever occurs
first. Change the air filter element when
the restriction gauge reads near the
change filter line and the gauge is yellow.
Allowing the restriction gauge to reach
maximum affects engine performance and
fuel economy.
355
Super Duty (TFE) Canada/United States of America, enUSA, First Printing
Maintenance
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