User Manual

6. The filter can be removed by
gently pulling it directly out of the
main enclosure. Be careful not to
drop or tap the filter on the housing
during removal as this could loosen
dirt and dust trapped in the filter
.
DO NOT clean or reuse the original
filter.
7. Inspect the sealing surfaces and
clean out any debris from the
inside of the filter enclosure before
installing the new filter. Be careful
to not push any contaminant into
the engine inlet.
8. Visually inspect the new filter prior
to installation. There should not be
any damage to the filter media or
gaskets, such as dents, dings,
cracks, or holes.
9. After installing the filter, inspect for
a good seal, if possible.
10. Install the filter housing cap and
tighten the hardware. DO NOT use
the housing cap to drive the filter
into position.
11. Start the engine and allow the air
system to reach operating
pressure. Activate the under hood
air switch and verify that there are
no air leaks.
Engine Air Filter Pre-Cleaner
(Option)
Certain truck models may have an engine
air filter pre-cleaner
. This pre-cleaner
keeps the main engine air filter from
quickly filling with dust in vocational
applications. The pre-cleaner should be
inspected and cleaned periodically as
defined in the Maintenance chapter or
sooner based on your vehicle's application.
Vehicles operating in extremely dusty
environments may need to inspect and
clean the pre-cleaner more frequently than
suggested in the Maintenance chapter. The
air filter restriction gauge may not be an
accurate indicator of pre-cleaner condition.
How to Remove the Pre-cleaner
Filter
Tools and Components:
• 8mm torque wrench
Perform with hood open (see How to Open
the Hood), standing on either side of hood.
1. Locate Pre-cleaner at underside of
hood, top center.
2. Remove fender liner for better
access to Pre-cleaner (see How to
Remove a Fender Liner on page
196).
3. Remove upper left and lower right
Pre-cleaner fasteners using
wrench, and set aside.
4.
Loosen, but do not remove, lower
left and upper right Pre-cleaner
fasteners.
5. Twist Pre-cleaner counter-
clockwise to unlock, then remove.
NOTE
Verify hood plenum is free of debris.
If cleaning the Pre-cleaner, see How to
Clean the Pre-cleaner Filter. If installing a
replacement, see How to Install a Pre-
cleaner Filter.
How to Clean the Pre-cleaner Filter
T
ools and Components:
• Gentle soap
• Warm, low-pressure water source
MAINTENANCE - Engine Maintenance
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