Air Intake 09 09–01 Air Cleaner Inspection NOTICE 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. 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. 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 ). 2. If necessary, replace the air cleaner element. For air cleaner element replacement instructions, see Group 09 of the Cascadia 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. Inspect the forward and rear mounting isolators for damage. See Fig. 3 . Ensure the bonds be- tween the rubber and the steel plates are com- pletely intact. See Fig. 4 . If a mounting isolator is damaged, replace it. For isolator replacement instructions, see Section 09.01 of the Cascadia Workshop Manual . 08/07/2007 f090452 Fig.
1, Manual-Reset Air Restriction Indicator, Graduated 5. Remove the pre-cleaners (if so equipped) from the hood plenum, then clean them with com- pressed air. 6. Reset the air restriction indicator. 7. Each time the air cleaner housing is replaced, perform the procedures in MOP 13–01 . 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 Cascadia Workshop Manual . Cascadia Maintenance Manual, November 2014 09/1