09–01 Air Cleaner Element
Inspection and
Replacement
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, as shown in
Fig. 1, or a go/no-go restriction indicator without
graduations, as shown in Fig. 2.
1. Inspect the air restriction indicator to see if air
restriction equals or exceeds the maximum
allowable restriction. For instructions, see the
Business Class® M2 Plus Driver’s Manual.
NOTICE
Do not use aftermarket air-cleaner elements.
Aftermarket air-cleaner elements may not seal the
housing correctly, which can lead to engine
damage and potentially the loss of warranty. When
replacing an air-cleaner element, use only the part
listed in PartsPro for the serial number of the
vehicle.
2. If necessary, replace the air cleaner element. For
air cleaner element replacement instructions, see
Group 09Group 09 of the Business Class M2
Plus Workshop Manual.
3. Inspect the air cleaner housing for cracks, leaks,
or any other damage. If the air cleaner housing
or element is damaged, replace it.
4. Reset the air restriction indicator.
5. Each time the air cleaner housing is replaced,
perform the procedures in
Group 13.
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
Air Intake 09
Business Class M2 Plus Maintenance Manual, 02/10/2023 09/1
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