Air Intake 09 09–01 Air Cleaner Inspection 2. Inspect the air cleaner housing for cracks, leaks, or any other damage. If the air cleaner housing or element is damaged, replace it. 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. 3. Check the inserts at all four assembly fastener locations (see Fig. 3 ). Each insert should pro- trude from the housing as shown in Fig. 4 . Vehicles may be equipped with either a manual-reset restriction indicator with graduations ( Fig.
1 ), or a go/no-go restriction indicator without graduations ( Fig. 2 ). 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. 5 1 2 3 08/07/2007 f090452 Fig. 1, Manual-Reset Air Restriction Indicator, Graduated 5 4 4 11/07/2014 f090471a 1. Air Cleaner Element Housing 2. Air Cleaner Element 3. Housing Cover 4. Screws 5. Inserts Fig. 3, Air Cleaner Assembly 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. 04/08/2005 f090431 Fig. 2, Manual-Reset Air Restriction Indicator, Go/ No-Go 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 . 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 .
122SD and Coronado 132 Maintenance Manual, February 2015 09/1