09–01 Air Cleaner Inspection
Restriction of air flow through the air cleaner element
is measured at the tap in the air cleaner outlet.
Check the restriction indicator at the air cleaner or in
the cab if the vehicle is equipped with a dash-
mounted restriction gauge.
Vehicles may be equipped with either a manual-reset
restriction indicator with graduations (
), or a
go/no-go restriction indicator without graduations
(
1.
Inspect the air restriction indicator to see if air
restriction equals or exceeds the maximum al-
lowable restriction. For instructions, see
Group
09
of the
122SD and Coronado Workshop
Manual
.
2.
Inspect the air cleaner housing for cracks, leaks,
or any other damage. If the air cleaner housing
or element is damaged, replace it.
3.
Check the inserts at all four assembly fastener
locations (see
). Each insert should pro-
trude from the housing as shown in
If the head/flange of any of the threaded inserts
is flush with or countersunk into the housing, re-
place the air cleaner assembly. See
Section
09.01
of the
122SD and Coronado Workshop
Manual
for replacement instructions.
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 ve-
hicle.
4.
If necessary, replace the air cleaner element. For
air cleaner element replacement instructions, see
Group 09
of the
122SD and Coronado Work-
shop Manual
.
08/07/2007
f090452
Fig. 1, Manual-Reset Air Restriction Indicator,
Graduated
04/08/2005
f090431
Fig. 2, Manual-Reset Air Restriction Indicator, Go/
No-Go
11/07/2014
f090471a
1
2
3
5
4
5
4
1.
Air Cleaner Element Housing
2.
Air Cleaner Element
3.
Housing Cover
4.
Screws
5.
Inserts
Fig. 3, Air Cleaner Assembly
Air Intake
09
122SD and Coronado 132 Maintenance Manual, February 2015
09/1
