Air Filter Restriction Gauge And Air Filter Replacement; Air Filter Restriction Gauge - Ford Diesel 2011 Supplement Manual

Maintenance and Specifications
AIR FILTER RESTRICTION GAUGE AND AIR FILTER
REPLACEMENT

Air filter restriction gauge:

The restriction gauge, located on
the upper housing of the air filter
assembly, measures the vacuum
inside the air filter. The more the air
filter is restricted (dirty, clogged),
the higher the vacuum reading
Check the air filter restriction gauge
whenever the hood is raised to
perform general engine maintenance
at least every 7,500 miles (12,000 km). If the vehicle is operated in
extremely dusty conditions, check and reset the gauge at least every
500 miles (800 km), or two weeks, whichever comes first.
Change the air filter when the gauge reads near the "change filter" line
and the chamber is filled with yellow. Engine performance and fuel
economy are adversely affected when the maximum restriction is
reached.
Blowing-out the air filter element with compressed air is not
recommended as the compressed air may damage the filter paper.
Note: It is not possible to determine the level of filter clogging by visual
appearance alone. A filter which appears to be dirty may actually have
several thousand miles (kilometers) of life remaining.
Use the underhood air filter restriction gauge to determine when
the air filter element needs to be changed.
51
2011 Diesel (eco)
Supplement, 5th Printing
USA (fus)