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09–00 Safety Precautions

Safety Precautions in this section apply to all
procedures within this group.

DANGER

When working on the vehicle, shut down the en-
gine or motor, set the parking brake, and chock
the tires. Before working under the vehicle, always
place jack stands under the frame rails to ensure
the vehicle cannot drop. Failure to follow these
steps could result in serious personal injury or
death.

09–01 Air Cleaner Element

Inspecting and
Replacing

NOTICE

All air intake components and connections must
be air- and water-tight. Dirt or dust entering the
engine can cause internal engine damage. Most of
the dirt and dust particles are silicates, which fuse
into abrasive glass-like particles when exposed to
engine combustion. These particles can grind pis-
ton rings, pistons, and cylinder liners. Do not op-
erate the engine with the air filter element or any
air intake component removed.

IMPORTANT: Due to the variety of possible driv-
ing conditions (dirt roads, paved roads, etc.), it
is critical to check the air restriction indicator, if
so equipped. If the vehicle is not equipped with
an air restriction indicator, inspect all compo-
nents of the air intake system and air filter every
six months. Replace the air filter every 12
months, or when filter restriction reaches 25
inH

O for Cummins diesel engines, or when the

air restriction indicator is completely red for
gasoline and Detroit

™

diesel engines (if

equipped with an air restriction indicator).

More

frequent inspections and/or filter replace-
ment may be needed if the vehicle is being
operated in a dusty environment, to avoid
damaging the vehicle.

Inspecting

NOTICE

Use the air intake restriction gauge rather than
visual inspection to determine if servicing the air
filter element is necessary. Removal of the air fil-
ter element can cause damage to the primary seal,
which may allow contaminants into the engine,
potentially causing engine damage.

IMPORTANT: Removal and visual inspection of
the air filter should only occur if the vehicle is
not equipped with an air restriction indicator.

Remove and visually inspect the air filter for holes,
tears, cracks, or other damage at the recommended
interval. Remove loose debris, such as leaves or
pine needles, from the filter housing. If the air filter is
damaged, replace it. See

Group 09

of the

Walk-In

Van Workshop Manual

for removal and installation

instructions, or take the vehicle to an authorized
Freightliner dealer.

Engine damage can occur if the air intake system is
not properly maintained. Use the air intake restriction
indicator to check for air intake system damage or
leaks. See

Fig. 1

and

Fig. 2

. Make sure the engine

is off and note the existing reading on the indicator.
Reset the indicator by pushing it down. See

Fig. 1

and

Fig. 2

. Start the engine and take a short test

drive. Check the indicator again and note the level of
restriction on the indicator. A decrease from the pre-
vious level of restriction or a very low air restriction
indicator reading (0 to 4 inH

O) could indicate an

air intake system problem such as a damaged
air filter, loose or disconnected air intake piping,
or a disconnected or damaged air restriction
indicator.

Replacing

NOTICE

Do not use aftermarket air-cleaner elements. After-
market air-cleaner elements may not seal the
housing correctly, which can lead to engine dam-
age and potentially the loss of warranty. When re-
placing an air-cleaner element, use only the part
listed in PartsPro for the serial number of the
vehicle.

Air Intake

Walk-In Van Chassis Maintenance Manual, June 2021

09/1